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以双(烷氧-亚胺芳氧)基钛(IV)配合物为催化剂,催化D,L-丙交酯开环聚合合成Ti-P聚乳酸材料,为分析材料的微观结构和性能,采用IR、1HNMR、13C NMR、TG/DSC、拉伸/压缩以及扫描电镜等方法,对聚乳酸材料进行表征及测试。实验结果表明:该钛(IV)配合物催化D,L-丙交酯的加成反应不是随机加成聚合,存在中等程度的等规加成立构选择性,并能明显阻止分子内的酯交换,对D,L-丙交酯显示出可控开环聚合的特征;与Sn-P聚乳酸相比,采用具有烷氧-亚胺芳氧基大体积空间位阻的钛(IV)配合物为催化剂,可得窄分散度、规整度好的Ti-P聚乳酸,并能提高其热稳定性、抗拉伸和压缩的力学性能。
The synthesis of Ti-P polylactic acid was catalyzed by ring opening polymerization of D, L-lactide using bis (alkoxy-imide aryloxy) titanium (IV) complex as a catalyst. The microstructure and properties of the materials were analyzed. IR, 1HNMR, 13C NMR, TG / DSC, tensile / compression and scanning electron microscopy methods were used to characterize and test the polylactic acid. The experimental results show that the addition reaction of D, L-lactide catalyzed by the titanium (IV) complex is not a random addition polymerization, and there exists a moderate degree of stereoselectivity for isotactic addition and can obviously prevent intramolecular transesterification , Showing the characteristic of controlled ring-opening polymerization of D, L-lactide; the use of a titanium (IV) complex having a sterically bulky alkoxy-imidoaryloxy group compared to Sn-P polylactic acid As a catalyst, Ti-P polylactic acid with narrow degree of dispersion and good regularity can be obtained, and the mechanical properties of the Ti-P polylactic acid can be improved, and the mechanical properties of the Ti-P polylactic acid can be improved.