SYNTHESIS OF PDMS-CONTAINING MACROAZOINITIATOR BY ONE STEP METHOD AND ITS APPLICATION IN PREPARATION OF BLOCK COPOLYMERS
一步法制备聚二甲基硅氧烷大分子偶氮引发剂及其用于嵌段共聚物的合成

A one step metohd approach for synthesis of polydimethylsiloxane(PDMS)-containing macroazoinitiator(MAI)was developed by direct polycondensation of hydroxyalkyl-terminated PDMS with 4,4'-azobis-4-cyanopentanoic acid(ACPA)under mild conditions by the use of dicyclohexylcarbodiimide(DCC)as the activating agent and 4-(dimethylamino)pyridinium-p-toluenesulfonate(DPTS)as the catalyst.The resulted MAI was then used as an initiator for polymerization of poly(ethylene glycol)methyl ether methacrylate(PEGMA)macro-monomers,and amphiphilic PDMS-PEG block copolymers were successfully synthesized.Results from the characterization of block copolymers showed that the resulted MAI had very high initiation efficiency and the block copolymers had microphase-separated structure.