Synthesis of syndiotactic polystyrene-graft-poly(ethylene glycol) copolymer by photochemical reaction |
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| Authors: | Yong Gao Zhihua Nie Huaming Li |
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| Affiliation: | (1) College of Chemistry, Xiangtan University, Xiangtan, Hunan, 411105, People’s Republic of China;(2) Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Xiangtan University, Xiangtan, Hunan, 411105, People’s Republic of China;(3) Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province, Xiangtan University, Xiangtan, Hunan, 411105, People’s Republic of China;(4) Key Lab of Environment-friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan, 411105, People’s Republic of China; |
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| Abstract: | Syndiotactic polystyrene-graft-poly(ethylene glycol) (sPS-g-PEG) copolymer was prepared by photochemical attachment of poly(ethylene glycol) chains to the benzoylated syndiotactic polystyrene
(BesPS) backbone. BesPS, a functional polymer bearing benzophenone moiety, was prepared in a heterogeneous process through
Friedel-Crafts acylation reaction using benzoyl chloride as benzoylating agent. This substrate was then dispersed in o-dichlorobenzene
at room temperature and mixed with poly(ethylene glycol) , which was reacted with the benzophenone moieties by illumination
with UV light (λ > 340 nm). As a result of the photochemical reaction, the hydrophilic poly(ethylene glycol) was chemically attached to the
hydrophobic syndiotactic polystyrene backbone. The resultant copolymer was characterized by FT-IR, NMR, and X-ray photoelectron
spectroscopy. In addition, the thermal properties of graft copolymers were also studied by means of DSC. |
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