| 引用本文: | 胡承波,徐强,王远亮,郑士远.钛(IV)配合物催化合成Ti-P聚乳酸材料微观结构分析[J].材料科学与工艺,2013,21(4):18-25.DOI:10.11951/j.issn.1005-0299.20130404. |
| HU Cheng-bo,XU Qiang,WANG Yuan-liang,ZHENG Shi-yuan.Microstructure analysis of Ti-P polylactide synthesized by titanium (IV) complex as catalyst[J].Materials Science and Technology,2013,21(4):18-25.DOI:10.11951/j.issn.1005-0299.20130404. |
|
| 摘要: |
| 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、1H NMR、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。 |
| 关键词: 配合物 丙交酯 聚乳酸 开环聚合 立构选择性 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20130404 |
| 分类号: |
| 基金项目:重庆市科委资助项目(cstc2013jcyjA50022)；重庆市教委资助项目(KJ071208, KJ121221). |
|
| Microstructure analysis of Ti-P polylactide synthesized by titanium (IV) complex as catalyst |
|
HU Cheng-bo1,2, XU Qiang1, WANG Yuan-liang2, ZHENG Shi-yuan1
|
|
(1. College of Material and Chemical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China; 2. Key Laboratory of Biorheological Science and Technology for Ministry of Education, Chongqing University, Chongqing 400044, China)
|
| Abstract: |
| Ti-P polylactide was synthesized by the ring-opening polymerization (ROP) of D,L-lactide catalyzed by bis(alkoxy-imine-phenoxy) titanium (IV) complex, and the microstructure of Ti-P polylactide was assayed and the properties were tested. Ti-P polylactide was well characterized by IR, 1H NMR、13C NMR, TG/DSC and SEM. Mechanical properties were tested by tension and compression experiments, and the fracture face was observed by SEM. The results indicated that the addition reaction of D,L-lactide in presence of titanium (IV) complex wasn’t random, and the titanium (IV) complex was stereoselective controlled ROP of D,L-lactide and could prevent the intramolecular transesterification. The polymerization reaction showed stereoselective controlled manner. In contrast to the Sn-P polylactide, the titanium (IV) complex with major alkoxy-imine-phenoxy ligand as catalyst could catalyze ROP of D,L-lactide and produce the Ti-P polylactide material with narrow dispersity and better degree of tacticity. The thermal stability, strengthen of tension and compression of material were improved. |
| Key words: complex lactide polylactide ROP stereoselective mechanical property |
