Aggregation behavior of poly(γ‐benzyl‐L‐glutamate)‐b‐polyisoprene‐b‐poly(γ‐benzyl‐L‐glutamate) rod‐coil‐rod triblock copolymer in N,N‐dimethylformamide |
| |
| Authors: | Yoichi Ogata Kazuhiro Iso Satoshi Kura Toshiyuki Hayakawa Yutaka Makita |
| |
| Affiliation: | 1. Advanced Lithography Research Group, JSR Micro, Inc., 1280 North Mathilda Avenue, Sunnyvale, California 94089;2. Tsukuba Research Laboratories, JSR Corporation, 25 Miyukigaoka, Tsukuba, Ibaragi 305‐0841, Japan;3. Fine Chemical Process Laboratory, Yokkaichi Research Center, JSR Corporation, 100 Kawajiri‐cho, Yokkaichi, Mie 510‐8552, Japan;4. Polymer Materials Laboratory, Performance Polymer Research Laboratories, Yokkaichi Research Center, JSR Corporation, 100 Kawajiri‐cho, Yokkaichi, Mie 510‐8552, Japan;5. Material Characterization and Analysis Laboratory, Yokkaichi Research Center, JSR Corporation, 100 Kawajiri‐cho, Yokkaichi, Mie 510‐8552, Japan |
| |
| Abstract: | Solution property of poly(γ‐benzyl‐L ‐glutamate)‐b‐polyisoprene‐b‐poly(γ‐benzyl‐L ‐glutamate) (GIG copolymer) was studied by using dynamic light scattering and static light scattering for N,N‐dimethylformamide (DMF) solution and DMF/toluene mixed solutions. GIG copolymer proved to aggregate in DMF and under DMF‐rich condition, that is, high‐polar region. The aggregate decreased in size, and completely disappeared under toluene‐rich condition, that is, low‐polar region. The correlation between solubility parameter and aggregate size of GIG copolymer in the DMF/toluene solution systems quantitatively demonstrated how strongly polarity caused by hydrogen bond made an impact on the aggregation behavior. Because the main driving force to the aggregation under DMF‐rich condition originates with polyisoprene (PIP) blocks, the aggregate in DMF is considered to be a core‐shell micelle consisting of flexible PIP core surrounded by rigid poly(γ‐benzyl‐L ‐glutamate) (PBLG) shell. The values of dimensionless parameter ρ, defined as the ratio of radius of gyration 〈S2〉1/2 to hydrodynamic radius RH, revealed that a single chain of GIG copolymer had the form of rigid rod with flexibility, that is, once‐broken rod, caused by the incorporation of a flexible PIP chain between two rigid PBLG rods in the DMF/toluene solution system. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1740–1748, 2010 |
| |
| Keywords: | association biopolymers block copolymers core‐shell polymers dynamic light scattering light scattering micelles self‐assembly solution properties structural characterization |
|
|
