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报道了一种叶立德活性聚合与开环聚合(ROP)相结合的新型合成方法,成功地合成了结构可控的聚亚甲基/聚乳酸嵌段共聚物(PM-b-PLA).首先通过叶立德活性聚合方法合成了含有端羟基的聚亚甲基(PM-OH,Mn=1800 g?mol-1,PDI=1.18),再以PM-OH为大分子引发剂,以辛酸亚锡[Sn(Oct)2]为催化剂,引发D,L-丙交酯(LA)的开环聚合,通过核磁共振氢谱(1H NMR),凝胶渗透色谱(GPC)和傅里叶变换红外光谱(FT-IR)证明了PM-b-PLA嵌段共聚物的形成;利用示差扫描量热仪(DSC)测试嵌段共聚物的结晶行为,结果显示,聚乳酸(PLA)嵌段的引入显著影响了聚亚甲基(PM)的结晶行为;扫描电子显微镜(SEM)观察结果表明:在低密度聚乙烯(LDPE)/PLA二元共混体系中,PM-b-PLA嵌段共聚物可作为共混相容剂改善LDPE和PLA的界面相容性;PM-b-PLA嵌段共聚物还可通过呼吸图法制备成有序多孔薄膜.
A novel synthesis method of Ylide active polymerization and ring opening polymerization (ROP) was reported and PM-b-PLA block copolymer with controlled structure was successfully synthesized. Firstly, (PM-OH, Mn = 1800 g? Mol-1, PDI = 1.18) was synthesized by the living polymerization method of Ylidek and then PM-OH was used as a macroinitiator to react with stannous octoate [Sn (Oct) 2] was used as a catalyst to initiate the ring-opening polymerization of D, L-lactide (LA) by means of 1H NMR, GPC and FTIR -IR) demonstrated the formation of PM-b-PLA block copolymers; the crystallization behavior of block copolymers was tested by differential scanning calorimetry (DSC) and the results showed that the introduction of polylactic acid (PLA) blocks significantly affected The crystallization behavior of polymethylmethacrylate (PM) was observed by scanning electron microscopy (SEM). The results showed that in the low density polyethylene (LDPE) / PLA binary blend system, the PM-b- The compatibilizer improves the interfacial compatibility between LDPE and PLA. PM-b-PLA block copolymers can also be prepared into ordered porous films by the respiratory map method.