Study of Phase Separation of Poly(N-isopropylacrylamide-co-styrene) Aqueous Solutions with Rayleigh Scattering Technique |
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| Authors: | Guibin Yi Zhenghong Zhu Fei Wang Xudong Chen Jin Yang Yunwei Huang |
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| Affiliation: | 1. Faculty of Light Industry and Chemical Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, China;2. Key Laboratory for Polymer Composite and Functional Materials of the Ministry of Education, Sun Yat‐sen University, Guangzhou, Guangdong 510275, China |
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| Abstract: | A thermally sensitive copolymer, poly(N‐isopropylacrylamide‐co‐styrene) [P(NIPAM‐co‐St)] (Mn?9.5×105 g/mol and Mw/Mn?1.51) was synthesized by soap‐free emulsion polymerization. The phase separation of the copolymer in water was investigated by Rayleigh scattering (RS) technique. The RS spectra revealed the transition of molecular conformation and the aggregation of molecular chains in the course of phase separation. The coil‐to‐globule and globule‐to‐coil transitions of P(NIPAM‐co‐St) chains were found in one heating‐and‐cooling cycle. By means of Avrami formula, apparent activation energy of phase separation of P(NIPAM‐co‐St) aqueous solutions was estimated. Moreover, a model was proposed to describe the phase separation process. |
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| Keywords: | poly(N‐isopropylacrylamide‐co‐styrene) Rayleigh scattering phase transitions polymerization |
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