Polymer Chemistry Blog

John (Jung Kwon) Oh is currently appointed as a Canada Research Chair (CRC) Tier II in Nanobioscience and an Assistant Professor in the Department of Chemistry and Biochemistry at Concordia University in Montreal, Canada. With BSc and MSc from Hanyang University in Korea, he earned his PhD degree from the University of Toronto in the area of polymer chemistry and materials science under the supervision of Prof. Mitchell A. Winnik. He then completed his postdoctoral research at Carnegie Mellon University with Prof. Kris Matyjaszewski, learning atom transfer radical polymerization (ATRP). He has been employed at Korea Chemical Company in Korea and Dow Chemical Company in Michigan USA over 10 years.

The research in his laboratory at Concordia enables the design and processing of macromolecular nanoscale materials for biological and biomedical applications. The nanomaterials of interest consist of polymeric, organic, and inorganic materials as well as hybrids having unique structural, electronic, magnetic, and optical properties. They are prepared by well-defined synthetic organic methods, controlled polymer chemistry as well as by templating with supramolecular assemblies. In particular, his interests are the integration of nanostructured biomaterials with biomedicine to develop advanced bionanomaterials that can interface biological processes as well as to understand their biological functions. The current focus of his research is on the development of a variety of novel biomaterials for drug delivery, cellular imaging, and tissue engineering, including superparamagnetic nanogels, rapid thermoresponsive hydrogels, and self-assembled degradable block copolymer micelles

Currently, his group has seven graduate students and postdoctoral fellows. The students and postdoc in his laboratory who participate in the cutting-edge research program have the opportunity to gain a broad range of skills and knowledge in organic polymer chemistry, materials chemistry and science, and the domain of biology and biomedical engineering.

What was your inspiration in becoming a chemist?

My impression about synthetic chemistry is that a synthetic chemist is similar to a professional cook who can select appropriate and various ingredients to create new tastes. I have trained as polymer chemist and materials scientist in both industrial and academic settings. My strong desire is to integrate my synthetic skill sets with biology and biomedicine, developing new materials for biomedical research.

What was the motivation behind the research in your recent Polymer Chemistry paper? (DOI:10.1039/c2py20154b)

Toward the effective cancer-targeting drug delivery applications of amphiphilic block copolymers as multifunctional nanocarriers, the control of the release of encapsulated anticancer therapeutics is critical. My research group has focused on the new design of stimuli-responsive degradable self-assembled micelles, with different numbers and types of degradable linkages positioned at various locations. These micelles having topological variations should allow the determination of the structure-property relationship between morphological variance and stimuli-responsive degradation. Ultimately, the advanced knowledge can be leveraged into optimizing degradable micelles offering tunable release of encapsulated anticancer therapeutics inside cancer cells.

In which upcoming conferences may our readers meet you?

I regularly attend the ACS meeting in USA and will attend the 95^th Canadian Chemistry Conference and Exhibition in Calgary in Canada.

How do you spend your spare times?

I walk with my wife and love to play tennis.

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

I loved and played baseball in my childhood. Because I was born in countryside in the city of Daejeon, Korea, I did not have an great opportunity to be a baseball player in my life. If I am given to a new life, I would be a professional baseball player.

Dr. Anna Carlmark received her PhD in polymer technology in 2004 from Fibre and Polymer Technology at KTH Royal Institute of Technology in Sweden, under the supervision of Prof. Eva Malmström. Between 2004-2007 she was employed as a researcher in several industries in Sweden (GE Healthcare AB, Gyros AB and SweTree Technologies AB) before she rejoined the group of Prof. Malmström in 2007 as an assistant professor in the division of Coating Technology at KTH. Her research focus is within the fields of controlled radical polymerization, the synthesis of complex macromolecular architectures, functional surfaces and (bio)fibre modifications. (http://www.kth.se/en/che/divisions/coating-technology)

 What was your inspiration in becoming a chemist?

Initially, I was really interested in biology, but in high school I stumble onto biochemistry which I thought was really fascinating as it explained so much about biological systems and even our own bodies. When I started university to goal was really to become a biochemist. Of course, I had no really insight into this field, and at the university I found myself much more drawn towards organic and polymer chemistry, and I found biochemistry quite tedious and boring. So I became a polymer chemist, which I have no regrets about!

What was the motivation to write this review? (DOI: 10.1039/C1PY00445J)

We (Prof Eva Malmström and I) have been working in the field of grafting cellulose by controlled radical polymerization for quite some time, actually 10 years this year, and we thought it was a nice idea to put a review together in this field. We had been talking about if for a couple of years, and so when I was invited to write a review for Polymer Chemistry it was perfect timing. I was very happy and honoured to receive the invitation!

Why did you choose Polymer Chemistry to publish your work?

Polymer Chemistry is a hot new journal that is really “up and coming”. The readers are well reflected in our research field and we thought it was the perfect choice for the review.

In which upcoming conferences may our readers meet you?

Unfortunately, I have no current plans to attend any conferences as I am having a baby in September. Usually I try to attend the ACS fall meetings, and in this case the earliest I will go will be in fall 2013.

How do you spend your spare times?  

I have two small children (ages 3 and 2) and a third on the way, so I keep myself pretty busy with the kids. We also have a country house where I love to go in the summer time. The Swedish archipelago is one of the most beautiful places in the world and a favourite place of mine, and I can warmly recommend a visit!

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

I considered becoming a nurse or physical therapist for a long time. I am very impressed with people working in medicine as I think they are true heroes. So if I was not a scientist, I think that is something that I would like to do.

Dr. Youliang Zhao was born in Shuangfeng County, Hunan Province, China, in September 1975. He received B.Sc. (1997) and M.Sc. (2000) degrees from Xiangtan University and Ph.D. in July 2003 at Institute of Chemistry, the Chinese Academy of Sciences with Prof. Fu Xi. He went to Tokyo Institute of Technology in November 2003 and worked as a JSPS Postdoctoral Fellow with Prof. Akira Hirao. From November 2005 to August 2007, he was a postdoctoral research fellow with Dr. Sébastien Perrier at University of Leeds. He became a full professor at College of Chemistry, Chemical Engineering and Materials Science, Soochow University since August 2007. He has published more than 50 peer reviewed research papers in scientific journals primarily on synthesis of complex macromolecular architectures, hybrid materials and nanocomposites by polymerization techniques such as controlled radical polymerization (CRP), ring-opening polymerization (ROP) and living anionic polymerization (LAP) and their combination with highly efficient coupling reactions. He has been invited to give lectures on his research work in international conferences as well as in some research institutions. His research interests include synthesis and properties of stimuli-responsive inorganic-organic hybrid materials, graphene-polymer nanocomposites, and functional polymers involving dendrimers, block, star, graft and hyperbranched polymers.

Please follow the link for further information on Zhao’s research group: http://www.polymer.cn/ss/zhaoyouliang/index.html or http://chemistry.suda.edu.cn/index.aspx?lanmuid=69&sublanmuid=603&id=65

What was your inspiration in becoming a chemist?

I become a chemist because of my strong interest in chemistry. Our chemistry teachers in high school always encouraged us to do some interesting chemistry experiments, which fully inspired my curiosity. The undergraduate and graduate studies further underlay my background in polymer science. I am so lucky to become a chemist that I am able to design and synthesize novel compounds and polymers, which may have potential applications in materials science and technology.

What was the motivation to write this article? (DOI:10.1039/C1PY00396H)

The motivation of this article was to develop a versatile method to prepare suprapure multicomponent block copolymers and recycle the functional solid supports. In our previous study, three types of methods comprising Z-supported RAFT graft polymerization, radical-induced chain exchange reaction, and combination of RAFT polymerization and coupling reactions were used to synthesize well-defined homopolymers and block copolymers grafted onto silica particles although the solid substrates were not recycled. In this continuous study, tandem RAFT process and CuAAC afforded better-defined block copolymer grafted silica, de-grafting process and postmodification gave access to highly pure block copolymers with terminal functionalities, and clickable silica particles were efficiently recovered until all the surface functionalities were vanished. Our study affords a versatile and general approach for surface modification, synthesis of high-purity block copolymers and recycle of clickable solid substrate, which is of great importance for “green” syntheses and development of renewable resources. We have extended this method for the fabrication of functional graphene-polymer nanocomposites.

Why did you choose Polymer Chemistry to publish your work?

Polymer Chemistry is an excellent journal which publishes high quality manuscripts in polymer science. It is natural for me to publish our best results in this journal due to its good visibility.

In which upcoming conferences may our readers meet you?

I will be in Changchun, China, during 2-6 June at the International Symposium on Polymer Chemistry (PC2012). I attend IUPAC International Conference on Novel Materials and Synthesis (NMS) & International Symposium on Fine Chemistry and Functional Polymers (FCFP) regularly and will attend NMS-VIII & FCFP-XXII to be held in Xi’An, China in October this year.

How do you spend your spare times?

When I am free, I like travelling and reading.

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

Chances are given, I may want to be a historian since the complex history always attracts me. I may also want to be a writer because of my strong interest in poem, essay and novel.