华东理工大学学报（自然科学版）2017，Vol.43Issue(4)：481-486,6.DOI:10.14135/j.cnki.1006-3080.2017.04.005
预聚物分子量对立体复合聚乳酸固相缩聚产物结构和性质的影响
Effect of Prepolymer Molecular Weight on Structure and Properties of Products Prepared by Solid State Polycondensation of Stereocomplex Polylactide
摘要
Abstract
Prepolymer L-polylactide and D-polylactide with reactivity for condensation polymerization and different molecular weights were prepared by using lactide as monomer,lactic acid and stannous octoate as initiator and catalyst respectively.A series of stereoblock polylactides were synthesized via solid state polycondensation using precursors obtained by melting blend of L-polylactide (PLLA) and D-polylactide (PDLA) with similar weight-average molecular weights.The chain structure,molecular weight,thermal properties and crystal structure of products acquired were characterized by H-NMR,GPC,DSC and XRD,respectively.The results show that the products have stereoblock structure.The molecular weight of the prepolymers will affect the relative content of homochiral crystal and stereocomplex crystal in the precursor,and thus affect the structure of the solid-phase polycondensation product.When the average molecular weight of PLLA and PDLA are both about 5×104,the molecular weight of the product increases rapidly and reaches 1.83×105,and which is beneficial to the improvement of crystallinity of the stereocomplex crystal in the final product.关键词
固相缩聚/预聚物分子量/立体嵌段聚乳酸/立体复合聚乳酸Key words
solid state polycodensation/molecular weight of prepolymer/stereoblock poly(lactic acid)/stereocomplex poly(lactic acid)分类
化学化工引用本文复制引用
董亮,王婷兰,唐颂超..预聚物分子量对立体复合聚乳酸固相缩聚产物结构和性质的影响[J].华东理工大学学报（自然科学版）,2017,43(4):481-486,6.基金项目
国家自然科学基金(51173041) （51173041）
