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首页> 外文期刊>Macromolecular chemistry and physics >Biobased copolymers composed of l -lactic acid and side-chain-substituted lactic acids: Synthesis, properties, and solid-state structure
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Biobased copolymers composed of l -lactic acid and side-chain-substituted lactic acids: Synthesis, properties, and solid-state structure

机译：由l-乳酸和侧链取代的乳酸组成的生物基共聚物：合成，性质和固态结构

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摘要

Various biobased copolyesters composed of l-lactic acid (LLA) and side-chain-substituted lactic acids (SLAs) with high molecular weight and LLA-rich composition are synthesized by direct solution polycondensation. Glycolic acid, 2-hydroxyisobutyric acid, (S)-2-hydroxy-3-methylbutanoic acid (LVOH), and (S)-2-hydroxy-4-methylpentanoic acid (LLOH) are chosen as SLAs. Wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) reveal that the substituent size of the SLAs determines whether or not SLA units are included in crystallites of the LLA sequences. Unlike poly(l-lactic acid), tensile necking is seen in the copolymers with 2 mol% LVOH and with 6 mol% LLOH. Enzymatic degradation is accelerated with increasing SLA content. Especially for 6 mol% LLOH, the SLA introduction improves both the mechanical properties and the enzymatic degradability.
机译：通过直接溶液缩聚，合成了由高分子量和富含LLA的高分子量L-乳酸（LLA）和侧链取代乳酸（SLA）组成的各种生物基共聚酯。选择乙醇酸，2-羟基异丁酸，（S）-2-羟基-3-甲基丁酸（LVOH）和（S）-2-羟基-4-甲基戊酸（LLOH）作为SLA。广角X射线衍射（WAXD）和小角X射线散射（SAXS）表明，SLA的取代基大小决定了SLA单元是否包含在LLA序列的微晶中。与聚（1-乳酸）不同，在具有2mol％的LVOH和6mol％的LLOH的共聚物中看到拉伸颈缩。随着SLA含量的增加，酶促降解加速。特别是对于6 mol％的LLOH，引入SLA可以改善机械性能和酶促降解能力。

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