生物降解聚酯材料L—PLA与ε—PCL共混行为的研究

A Study on the Blend Behavior of the Biodegradable Polylactone——L-PLA and ε-PCL

本文用本体融熔共混法研究了聚(L-丙交酯)与聚(ε-己内酯)的共混行为。发现在存在少量催化剂钛酸丁酯Ti(OBu)_4情况下,两种均聚物于150C°明显降解。^(13)C-NMR 核磁共振精细谱图及扫描示差热分析DSC 谱图证实它们间发生酯交换。由^(13)C-NMR 与~1H-NMR 谱图计算出共聚物中L-LA 与-CL 嵌段平均链长与它们的摩尔比值。

This paper studies the bulk-melting blend behavior of L-PLA/PCL and their transesterifi-cation.The degration of two polymers is apparently observed in blend with catalyst titanium(Ⅳ)tetrabutoxide Ti(OBu)_4 at 150℃.The presence of significant transesterification is provedby ^(13)C-NMR spectroscopy and differential scanning calorimetry(DSC)in blend of L-PLA/PCL.The average lengths of lactone block (?) and of L—lactide block Ll—in the copolymer are calcu-lated from ^(13)C-NMR spectra and their molar composition are derived from ~1H-NMR spactra.