Author Archive

Polymer Chemistry Author of the Week: Eva Harth

Eva Harth studied chemistry at the University of Bonn, Germany, and the University of Zurich, Switzerland. In 1998 she obtained her PhD for work in the area of fullerene adducts and polymers from the MPI for Polymer Research.  A postdoctoral fellowship with CPIMA (NSF-Center for Polymer Interfaces and Macromolecular Assemblies) brought her to the IBM Almaden Research Center, California USA, to work under the direction of Prof. Craig J. Hawker. In 2001 she joined XenoPort, Inc. as a Staff Scientist investigating enabling technologies for the increased bioavailability of macromolecular therapeutics and took a position as Assistant Professor at Vanderbilt University in the Department of Chemistry in 2004 with a secondary appointment in the department of Pharmacology. In 2011 she was promoted to Associate Professor with tenure and is member of the Vanderbilt Ingram Cancer Center (VICC), Institute of Chemical Biology (VICB) and the Institute of Nanoscale Science and Engineering(VINSE). She is serving on the Editorial Board of Polymer Chemistry since its start in 2009 and is one of its Associate Editors. As advisory editorial board member she is active for ACS MacroLetters, Macromolecules and as associate editorial board member for the American Journal of Cancer Research. The focus of her research advances delivery technologies across challenging biological barriers and towards highly vascular tumors.

 

Please follow the link for further information on Eva’s research group and her recent paper published in Polymer Chemistry.

What was your inspiration in becoming a chemist?

I liked to find out how biological processes work and then I started to like the fact that I could make a real product with my hands and enjoyed bench work.  Chemistry is so versatile and affects so many areas in life and provides hopefully the better solution to an existing problem.  My current work focuses on questions in the biomedical field; I appreciate to know about the clinical challenges through collaborators and being in an inspiring environment. I think it is about what questions and challenges you want to pick as a chemist and that you have means to go after them in many different ways; this is the most exciting part.

What was the motivation behind the research in your recent Polymer Chemistry paper?

It is an extension of a paper that we have published in 2007 describing intramolecular chain crosslinkers other than benzocyclobutenes because they have been notoriously difficult to make.  The clean reaction of these derivatives was always attractive to build nanoscopic materials, going back to the work of Craig Hawker and Bob Miller at IBM. In the current paper we describe a low temperature version that might be useful to engage these benzocyclobutene units to a broader application. Although, at the moment the majority of my work is directed to find practical chemistries to utilize cross-linking reactions to prepare controlled macromolecular networks involving a multitude of chains. We found that these structures “nanosponges” have beneficial properties to solubilize but also release drug molecules based on the applied crosslinking conditions with striking effects in vivo.

Why did you choose Polymer Chemistry to publish your work?

It has a large readership in Europe and the US and wanted to place it where it is likely to be read by a very diverse audience like it is known from RSC journals. Of course, I find it to be a wonderful journal and I am glad that it found very quickly a large acceptance in the field and that authors really send their best work.

In which upcoming conferences may our readers meet you?

I will attend both ACS meetings, for the first time I will participate in the AACR conference in Chicago in April. In May, I am in Rostock, Germany, and give a talk at the implants and biomaterials conference, then Warwick 2012, where the impact factor of Polymer Chemistry will be announced (!) and later in the year, the ACN Nanomedicine conference in Sydney and the Nanotech conference in CA. Two Zing Conferences in November, one of them will be a Polymer Chemistry conference focused on materials for biomedical and energy applications which will be a great conference bridging the fastest developing areas of polymer research.

How do you spend your spare times?

I started last year to get my private pilot license and I hope that I can have my first solo this year. Tennessee has these little airports all over the place and the countryside is beautiful, perfect to see it from the air and fly (in a Cessna) to cute places.

Which profession would you chose if you were not a scientist?

I would work in an auction house, as art dealer or architect. It is a great joy for me to find and collect pieces of young artists. All my family is working in construction and interior design and I could always relate to it.

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Polymer Chemistry Paper of the Week: Facile glycosylation of dendrimers for eliciting specific cell-material interactions

Graphical abstract: Facile glycosylation of dendrimers for eliciting specific cell–material interactions

Glycan-protein interactions represent an important class of mechanisms underlying numerous biological and pathological events that include cell recognition, trafficking, signalling and infection. Glycodendrimers of tunable saccharide loading levels using different types and generations of dendritic substrates were prepared using thio-urea linkage and click chemistries. Luo et al report a general approach to synthesize saccharide modified dendrimers via direct conjugation of underivatized reducing saccharides to hydrazide functionalized dendrimers.

Facile glycosylation of dendrimers for eliciting specific cell-material interactions by Xiaopeng Liu, Jie Liu and Ying Luo Polym. Chem. 2012, 3, 310-313.

To keep up-to-date with all the latest research, sign up for the journal’s e-alerts or RSS feeds or follow Polymer Chemistry on Twitter or Facebook.

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Polymer Chemistry Author of the Week-Andrew I. Cooper

Andy Cooper obtained his Ph.D at the University of Nottingham in 1994 for the study of organometallic reaction mechanisms. He then held an 1851 Fellowship at the University of North Carolina at Chapel Hill, USA, working on polymerization reactions and phase transfer processes in supercritical fluids (1995–1997). He next held a Ramsay Memorial Research Fellowship at the Melville Laboratory for Polymer Synthesis in Cambridge, working on heterogeneous polymerizations in supercritical CO2 (1997–1999). He joined the University of Liverpool in January 1999 as a Royal Society University Research Fellow, where he now holds a personal chair. He is the founding Director of the Centre for Materials Discovery (established in 2007) and was a cofounder of a spin-out company, IOTA NanoSolutions, in 2005. He was Head of Chemistry and then Head of the School of Physical Sciences in the period 2007–2011. In addition to research in polymer chemistry, he has interests in crystal engineering, colloid science, and chemical problems related to energy.

Please follow the link for further information on Andy’s research group and his recent paper published in Polymer Chemistry.

What was your inspiration in becoming a chemist?

The constant albeit small chance of discovering something really remarkable and important, this is what makes research so exciting.

 

What was the motivation behind the research in your recent Polymer Chemistry paper?

We published our first paper on conjugated microporous polymers (CMPs) in 2007 (Angew. Chem., Int. Ed., 2007, 46, 8574). There have been several nice follow-up studies since, but the most interesting have exploited the combination of extended conjugation and porosity in these materials. For example, one of the best papers in this area was published last year by Prof. Donglin Jiang (Angew. Chem., Int. Ed., 2011, 50, 8753) describing supercapacitive CMPs that rival nanocarbons. For these applications it will be important to control both porosity and also physical properties related to conjugation, such as optical band gap or charge mobility.  In this new study, we set out to synthesize triazine analogues of our first CMP materials. We found that the materials, while amorphous, were ‘isoreticular’ in the sense that changing from benzene to triazine nodes does not affect the microporosity.  The triazine CMPs, however, showed slightly higher CO2 uptakes and optical band gaps that can be varied by copolymerization.   Variation of band gap could be useful in applications like photocatalysis.  Prof. Wenbin Lin at UNC has shown that related materials are good photocatalysts.

 

Why did you choose Polymer Chemistry to publish your work?

I’ve found that the RSC journals have fast publication times and good editing and refereeing.  I’m sure Polymer Chemistry will not be an exception.

 

In which upcoming conferences may our readers meet you?

2012 ACS meetings (both Spring and Fall), Pott Shrigley, and of course Warwick 2012.

 

How do you spend your spare times?

I haven’t had time for ‘hobbies’ as such for years, but I did recently take up mountain biking.  Perhaps this signifies a mid-life crisis…

 

Which profession would you choose if you were not a scientist?

A stunt man.  You get to live in a trailer.

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Polymer Chemistry Paper of the Week: Constructing star polymer via modular ligation strategies

Graphical abstract: Constructing star polymers via modular ligation strategies

The synthesis of complex macromolecular architectures to control the polymer properties is a key field to study in polymer science. In particular, star shaped polymers have been used in wide range of applications from biomedical field to oil industry.

Constructing star polymers via modular ligation strategies by Ozcan Altintas, Andrew P. Vogt, Christopher Barner-Kowollik and Umit Tunca Polym. Chem. 2012, 3, 34-45.

To keep up-to-date with all the latest research, sign up for the journal’s e-alerts or RSS feeds or follow Polymer Chemistryon Twitter or Facebook.

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Polymer Chemistry Paper of the Week: Lubrication mechanism of concentrated polymer brushes in solvents: Effect of solvent viscosity

Graphical abstract: Lubrication mechanism of concentrated polymer brushes in solvents: effect of solvent viscosity

Yoshinobu and his co-workers investigated the frictional and lubricational properties of concentrated polymer brushes in ionic liquids and toluene using the colloidal probe AFM technique.

Lubrication mechanism of concentrated polymer brushes in solvents: Effect of solvent viscosity by Akihiro nomura, Kohji Ohno, Takeshi Fukuda, Takaya Sato and Yoshinobu Tsusi Polym. Chem. 2012, 3, 148-153.

To keep up-to-date with all the latest research, sign up for the journal’s e-alerts or RSS feeds or follow Polymer Chemistryon Twitter or Facebook.

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Polymer Chemistry Paper of the Week: An isoindigo and thienol[3,2-b:2′,3′-d]silole copolymer for polymer solar cells

Graphical abstract: An isoindigo and dithieno[3,2-b:2′,3′-d]silole copolymer for polymer solar cells

Organic photovoltaics have pushed for the development of photonic materials capable of solution processing for large area low-cost fabrication on light-weight flexible substrates.

Reynolds and his co-workers reported the development of a new p-type polymer with deep HOMO and LUMO energy levels that enabled the fabrication of high open circuit voltage polymer solar cells when blended with fullerene derivatives.

An isoindigo and dithieno[3,2-b:2′,3′-d]silole copolymer for polymer solar cells by Romain Stalder, Caroline Grand, Jegadesan Subbiah, Franky So and John R. Reynolds Polym. Chem. 2012, 1, 89-92.

To keep up-to-date with all the latest research, sign up for the journal’s e-alerts or RSS feeds or follow Polymer Chemistry on Twitter or Facebook.

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Polymer Chemistry Paper of the Week: Aqueous RAFT/MADIX polymerization of N-vinyl pyrrolidone at ambient temperature

Poly(N-vinyl pyrrolidone) has been an important ingredient for medicine, pharmacy and cosmetics due to its excellent wetting and film forming properties. N-vinyl pyrrolidone (NVP) can be readily polymerized by free radical polymerization; however, it has been a challenge to polymerize this monomer by controlled radical polymerization techniques.

Destarac and his co-workers have demonstrated controlled RAFT/MADIX polymerization of NVP in water and at room temperature. Moreover, they have presented the preparation of poly(acrylamide)-b-(N-vinyl pyrrolidone) for the first time.

Aqueous RAFT/MADIX polymerisation of N-vinyl pyrrolidone at ambient temperature by Aymeric Guinaudeau, Stéphane Mazières, D. James Wilson and Mathias Destarac Polym. Chem. 2011, 3, 81-84.

To keep up-to-date with all the latest research, sign up for the journal’s e-alerts or RSS feeds or follow Polymer Chemistryon Twitter or Facebook.

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Introducing Polymer Chemistry Paper of the Week!!!

Dear Polymer Chemistry Blog Readers,

In 2011, we have published short interviews with 48 Polymer Chemistry Authors and these have attracted great attention in the Polymer Chemistry community. We will keep posting short interviews with our authors this year as well.

We are happy to announce that we will start highlighting 4 papers from every issue as Paper of the Week in the Polymer Chemistry blog. From time to time we will be discussing these papers with their authors or other leading scientists in that field. These papers will also be posted on Twitter and Facebook. Please feel free to send us your feedback or questions on these papers. We hope you will enjoy reading our blog posts in 2012!

Best wishes,
PC Blog Writers

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Conference feedback-Precision Polymer Materials (P2M)

1st Precision Polymer Materials (P2M) networking meeting was held in Strasbourg, France between December 11th and 14th. The conference was funded by the European Science Foundation (ESF) and chaired by Sebastien Lecommandoux. There were 94 attendees, who presented 34 lectures and 56 posters. The best 10 posters were selected and each presenter was awarded with 1000 euro by the ESF that they can spend towards the MRS meeting expenses in Boston, USA. The alphabetical list of the names and titles of the poster prize winners is as follows.

  • Elaboration of micellar gels based on metal-ligand interactions
    Jérémy Brassinne, Universite Catholique de Louvain, Belgium
  • Novel block copolymers for use in non-polar non-aqueous dispersion polymerisations: replacements for poly(hydroxystearic acid)-g-poly(methyl methacrylate)
    Kate Belsey, University of Kent, United Kingdom
  • Polymeric Vesicles with Dynamically Controlled Surfaces
    René Brinkhuis, Radboud University of Nijmegen, Netherlands
  • Polylactide stereocomplexes based on modified carbon nanotubes
    M. Brzezinski,Polish Academy of Sciences, Poland
  • Double modified polymers based on polythiol formation and thiol-ene reactions
    Fabienne Goethals, Ghent University, Belgium
  • Controlling inorganic crystallization by organized polymer films
    Agnieszka Jagoda, University of Basel, Switzerland
  • Polymer vesicles: Biomimetism and membrane properties
    Maïté Marguet, Universite de Bordeaux, France
  • Synthesis of Sequence-Defined Oligopeptide-Polymer Conjugates via Atom Transfer Radical Polymerization
    Anna Meszynska, University of Strasbourg, France
  • Selective Adsorbents for Nucleobases and Nucleobase-Containing Compounds
    Anna Plewa, University of Krakow, Poland
  • Smart Polymeric Sensors
    Gertjan Vancoillie, Ghent University, Belgium

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Polymer Chemistry Author of the Week-Levent Demirel

A. Levent Demirel received his B.Sc. degree in Electrical Engineering & Physics from Boğaziçi University, Istanbul, in 1989, and Ph.D. degree in Physics from University of Illinois, Urbana-Champaign, USA in 1996. He was postdoctoral researcher at FOM Institute AMOLF in Amsterdam in 1996-1997. He joined Koç University Chemistry Department as faculty member in 1997 where he was promoted to full professor in 2008. Currently, he is the Associate Dean of College of Sciences. He has received TÜBİTAK (Turkish Scientific and Technical Research Council) Young Scientist Award in 1999, TÜBA (Turkish Academy of Sciences) Young Scientist Award in 2001 and Koç University Werner von Siemens Excellence Award in 2003. In 2006, he has been elected as associate member of Turkish Academy of Sciences. His current research interests are in the field of surface and polymer physical chemistry.

Please follow the link for further information on Levent’s research group and his recent paper published in Polymer Chemistry.

What was your inspiration in becoming a chemist?

 

Though my current research is in the field of physical chemistry, I am a physicist by training. I will be happy as long as I stay in science as a major, whether it is physics or chemistry. I was fond of numbers, calculations and equations as a kid. My aunt was a primary school teacher at a village. When I was about 5 years old, I attended her classes for a while where I met numbers and calculations first time. Then at the high school I had very inspiring physics, chemistry and math teachers. I started as an electrical engineering undergraduate, but my desire to understand single transistor dominated over analyzing complex electronic circuits and I went for PhD in Physics at University of Illinois, Urbana-Champaign. I later switched to soft matter physics, by chance, and worked under the supervision of Prof. Steve Granick on viscoelasticity of molecularly thin liquid films. Then at postdoc, I worked on thin films of liquid crystals and block copolymers. There is a lot overlapping in physics and chemistry when you work on soft matter and I naturally moved into the field of physical chemistry after starting as a faculty member at Koç University Chemistry Department.

What was the motivation behind the research in your recent Polymer Chemistry paper? (DOI: 10.1039/C1PY00463H)

The question we are after is quite fundamental and practical: Why are initially clear homogeneous polymer solutions not stable in time and agglomerates formed? Chemists do not like it when chemicals can not be dissolved in a solvent for further analysis or processing, but frequently encounter it in the lab especially with macromolecules. The change in temperature, pH may trigger such irreversible agglomeration among other reasons. Poly(2-isopropyl-2-oxazoline) was known to form irreversible crystalline fibers when kept above cloud point temperature for extended times. We expected the same for poly(2-ethyl-2-oxazoline) (PEOX) as similar interactions are in charge, but could not observe any structure formation for a long time. My PhD student Pınar Tatar Güner was patient enough to wait long (several weeks) to observe that crystalline PEOX fibers are also formed. Then, we controlled this self-assembly process by electrolytes and characterized these fibers structurally.

Why did you choose Polymer Chemistry to publish your work?

As much as I can, I regularly check the contents of every new issue of the major journals in my field. Since its first issue in 2010, I found many high quality papers, very relevant to my research interests in every issue of Polymer Chemistry. It already had high impact on my research and I decided to send it to Polymer Chemistry.

In which upcoming conferences may our readers meet you?

I plan to attend to ACS Spring Meeting in San Diego, USA, in March 2012 where there will be a session on poly(2-oxazoline)s.

How do you spend your spare times?

My wife and I like travelling and spending time in nature.

Which profession would you choose if you were not a scientist?

I would choose a profession where I can spend more time out in the field – being a farmer, an archeologist, a field biologist, a geologist.

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