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Citation: QIAN Hao, HUANG Sheng-Mei, XU Hua-Ming. Preparation of Polystyrene-g-poly(ethylene glycol) and Its Surface Modification for Polystyrene[J]. Chinese Journal of Applied Chemistry, ;2007, 24(9): 1027-1031. shu

Preparation of Polystyrene-g-poly(ethylene glycol) and Its Surface Modification for Polystyrene

1.
College of Material Science and Engineering, Huaqiao university, Quanzhou 362021

Corresponding author: QIAN Hao,
Received Date: 30 September 2006
Available Online: 25 January 2007
Fund Project: 福建省自然科学基金(E0510019)资助项目 (E0510019)

The method of precipitation polymerization was employed to synthesize styrene-co-maleic anhydride copolymers(SMA). The comb-like amphiphilic copolymers based on maleic anhydride copolymer backbone and PEG grafts(PEG-g-PS) were prepared at high conversion rate by utilizing thionyl chloride to convert acid anhydride groups into acyl chloride groups. When this amphiphilic copolymer was used as the surface modifying macromolecules, the chain segments of polyether on PEG-g-PS could preferentially aggregate on the surface of PEG-g-PS/PS blends to increase the surface polarity of PS. The surface polarity of the blends could reach to 11.6 mN/m, which is about three times higher than that of pure PS(3.5 mN/m). Because of the compatibility between PEG-g-PS and PS, the effective duration of surface modification by PEG-g-PS is greatly extended and the surface functionalization even becomes permanent for the material. Furthermore, more polyether chain segments on PEG-g-PS could selectively migrate to the surface by the inducement of polar solvent. The attenuated total reflectance Fourier transform infrared spectroscopy and contact angle measurement were used to detect the surface structure and surface properties.
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