Synthesis and thermal properties of poly(methyl methacrylate)‐poly(L‐lactic acid)‐poly(methyl methacrylate) tri‐block copolymer |
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| Authors: | Jun Shen Wei Jiang Ying Liu Rongqing Wei Xiaoning Liu Yu Zhong Jie Xu Linling Li Gi Xue |
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| Affiliation: | 1. Department of Pharmaceutical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 210009, China;2. Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China;3. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China |
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| Abstract: | Poly(methyl methacrylate)‐poly(L ‐lactic acid)‐poly(methyl methacrylate) tri‐block copolymer was prepared using atom transfer radical polymerization (ATRP). The structure and properties of the copolymer were analyzed using infrared spectroscopy, gel permeation chromatography, nuclear magnetic resonance (1H‐NMR, 13C‐NMR), thermogravimetry, and differential scanning calorimetry. The kinetic plot for the ATRP of methyl methacrylate using poly(L ‐lactic acid) (PLLA) as the initiator shows that the reaction time increases linearly with lnM]0/M]. The results indicate that it is possible to achieve grafted chains with well‐defined molecular weights, and block copolymers with narrowed molecular weight distributions. The thermal stability of PLLA is improved by copolymerization. A new wash‐extraction method for removing copper from the ATRP has also exhibits satisfactory results. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 |
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| Keywords: | poly(methyl methacrylate)‐poly(L‐lactic acid)‐poly(methyl methacrylate) atom transfer radical polymerization thermal properties wash‐extraction method |
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