Citation: Jian-Hua Wang, Li-Ping Zhu, Zhuan Yi, Jian-Hua Li, You-Yi Xu, Bao-Ku Zhu. SUPERCRITICAL CARBON DIOXIDE ASSISTED SYNTHESIS OF AMPHIPHILIC GRAFT COPOLYMERS BASED ON POLY(STYRENE-CO-MALEIC ANHYDRIDE) WITH METHOXYL POLY(ETHYLENE GLYCOL) SIDE CHAINS[J]. Chinese Journal of Polymer Science, ;2012, 30(2): 173-180. doi: 10.1007/s10118-012-1109-3 shu

SUPERCRITICAL CARBON DIOXIDE ASSISTED SYNTHESIS OF AMPHIPHILIC GRAFT COPOLYMERS BASED ON POLY(STYRENE-CO-MALEIC ANHYDRIDE) WITH METHOXYL POLY(ETHYLENE GLYCOL) SIDE CHAINS

Received Date: 8 March 2011
Revised Date: 29 April 2011

Fund Project: This work was financially supported by the 973 Program of China (No. 2009CB623402) and the Fundamental Research Funds for the Central Universities (MOE Engineering Research Center of Membrane and Water Treatment Technology, Grant no.KYJD09011) and the 863 Program of China (No. 2009AA062902) and Zhejiang Provincial Sci Tech Plan of China (No. 2010C31028).

Supercritical carbon dioxide (scCO2) was used as a reaction medium in synthesizing amphiphilic graft copolymers composed of poly(styrene-co-maleic anhydride) (SMA) backbones and methoxyl poly(ethylene glycol) (MPEG) side chains via esteri?cation. The synthesized copolymers were characterized by Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), 1H-NMR, thermo-gravimetric analysis (TGA) and differential scanning calorimetric analysis (DSC). The gelation phenomenon was suppressed effectively by tuning reaction conditions. The influences of scCO2 temperature and pressure on the conversion of anhydride were investigated. It was found that the highest conversion ratio occurred at 80℃ under a constant pressure of 14 MPa or 26 MPa. With the increase of scCO2 pressure, the conversion ratio increased first, and then leveled off. The conversion ratio of anhydride could be controlled by regulating the reaction conditions. It was also revealed that using low molecular weight MPEG brought a high conversion ratio of anhydride.
- Supercritical carbon dioxide
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