Mixtures poly((R)-3-hydroxybutyrate) and poly(l-lactic acid) subjected to DSC

被引：0
作者：
Lenka Malinová
Jiří Brožek
机构：
[1] Institute of Chemical Technology,Department of Polymers
[2] Prague,undefined
来源：
Journal of Thermal Analysis and Calorimetry | 2011年 / 103卷
关键词：
Poly((; )-3-hydroxybutyrate); Poly(; -lactic acid); Poly(; -lactide); Miscibility; DSC; TMDSC;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Blends of bacterial poly((R)-3-hydroxybutyrate) (PHB) and poly(l-lactic acid) (PLLA) synthesized by polycondensation of l-lactic acid or by ring-opening polymerization of l-lactide were studied. Miscibility was investigated through both conventional differential scanning calorimetry (DSC) and temperature-modulated DSC (TMDSC). PHB and low-molar mass PLLA were miscible in a whole concentration range, and a single glass transition temperature was observed. On the other hand, PHB/high-molar mass PLLA mixtures phase separate, giving rise to two glass transition temperatures corresponding to PHB and PLLA. A treatment of blends at 190 °C leads to formation of block/multiblock/random copolymers, and blends become miscible.
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页码：653 / 660
页数：7
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