PLA大分子单体与NVP接枝共聚物的初步研究

以辛酸亚锡为催化剂,甲基丙烯酸羟乙酯(HEMA)为共引发剂引发消旋-丙交酯(D,L-LA)开环聚合,制备了末端双键功能化的聚乳酸大分子单体(PLA-HEMA);在此基础上,考察了大分子单体与N-乙烯基吡咯烷酮(NVP)的溶液自由基共聚合反应,并初步研究了共聚单体摩尔比和PLA支链长度对合成的两亲性接枝共聚物性能的影响.结果表明,随大分子单体投料量和PLA支链长度增大,共聚物膜的拉伸强度和模量增大,而亲水性有所下降.

Preliminary study on the graft copolymers of poly (D, L -lactide) macromonomers and N- vinyl pyrrolidone

Poly(D,L-lactide) macromonomers with the functional end double bond were first prepared by bulk ring-opening polymerization of D,L-lactide(D,L-LA)(using) stannous 2-ethyl hexanoate(Sn(Oct)_2) as a catalyst,and 2-hydroxyethyl(metha-)crylate(HEMA) as a co-initiator.Then,the amphiphilic graft copolymers from(macro-)monomers and N-vinyl pyrrolidone(NVP) were obtained by solution free radical copolymerization,the effects of the co-monomer molar ratio and the length of the polylactide(PLA) branched chain on the properties of the copolymers were preliminary studied.Results showed that the tensile strength and modulus of the copolymer membrane increased,while the hydrophilicity was somewhat decreased with increasing molar content of(macro-)monomer and the length of PLA branched chain.