高等学校化学学报2012，Vol.33Issue(9)：2092-2098,7.DOI:10.3969/j.issn.0251-0790.2012.09.038
三臂支化PLLA-PDLA嵌段共聚物的合成及立构复合结晶行为
Synthesis of Tri-arm PLLA-PDLA Block Copolymers and Its Stereocomplex Crystallization Behavior
摘要
Abstract
The tri-arm poly ( L-lactide) was prepared by ring-opening polymerization ( HOP) of L-lactide (LLA) with 1,1, l-tris(hydroxymethyl) ethane (TME) as an initiator. The terminal hydroxyls of the pre-poly-mer were activated by stannous octanoate[ Sn( Oct) 2 ]. Then a series of novel tri-arm poly ( Z,-lactide ) -poly ( D-lactide) (PLLA-PDLA) block copolymers were synthesized by ROP of D-lactide(DLA) with functioned PLLA-SnOct pre-polymer as a macroinitiator. Nuclear magnetic resonance spectroscopy ( NMR) and gel permeation chromatography( GPC) results confirmed the configuration of the tri-arm PLLA-PDLA block copolymers with high isotacticity and high molecular weight. The block structure of copolymer could be readily adjusted in terms of the feed ratio of monomer with the PLLA pre-polymer. Differential scanning calorimetry ( DSC) and wide-angle X-ray diffraction ( WAXD) demonstrated that the stereocomplex PLA ( Sc-PLA) were formed between intramolecular and intermolecular PLLA and PDLA blocks. The melting temperature(Tm) of Sc-PLA crystals was above 200 ℃ , which was much higher than that of pure PLLA. These results show that a novel tri-arm PLLA-PDLA block copolymer would be promising as a heat-resistant PLA engineering material.关键词
聚乳酸/嵌段共聚物/立构复合/结晶Key words
Poly(lactide)/ Block copolymer/ Stereocomplex/ Crystallization (Ed. : D, Z)分类
化学化工引用本文复制引用
石文鹏,赵辰阳,李速明,范仲勇..三臂支化PLLA-PDLA嵌段共聚物的合成及立构复合结晶行为[J].高等学校化学学报,2012,33(9):2092-2098,7.基金项目
国家自然科学基金(批准号:51073041)资助. （批准号:51073041）
