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首页> 外文期刊>RSC Advances >The crystallinity, thermal properties and microscopic morphology of di-block copolymers of l-lactide and several acrylates
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The crystallinity, thermal properties and microscopic morphology of di-block copolymers of l-lactide and several acrylates

机译：L-丙交酯二嵌段共聚物的结晶度，热性质和微观形态和几种丙烯酸酯

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摘要

In this paper a series of di-block copolymers of L -lactide and (meth)acrylate [(M)A, representing methyl methacrylate, tert -butyl acrylate and 2-ethylhexyl acrylate] were synthesized by varying the molecular weight of the polylactide (PLLA) macroinitiator and the structure of the (meth)acrylate monomers. The glass transition temperature, crystallinity and thermal stability of copolymers with different poly(meth)acrylate [P(M)A] blocks were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results indicated that the glass transition temperature of the copolymers could be tuned by changing the chain structure and chain length of the P(M)A blocks. Besides, the crystallization of the copolymers was inhibited by the introduction of P(M)A blocks, and the toughness of the copolymers could be tuned. It is noted that the thermal stability of the copolymers depended on the type of P(M)A blocks and the PLLA/P(M)A blocks ratio. Furthermore, the microphase separation of copolymers in thin films was observed by atomic force microscopy (AFM) and scanning electron microscopy (SEM), and the results showed that the composition of copolymers significantly affected the surface morphology of the block copolymer thin films.
机译：在本文中，通过改变聚丙环酸酯的分子量来合成一系列L-阶丙烯酸酯和（甲基）丙烯酸甲酯[（m）A，代表甲基丙烯酸甲酯，丙烯酸叔丁酯和2-乙基己酯]的二嵌段共聚物。 PLLA）杂种蛋白剂和（甲基）丙烯酸酯单体的结构。通过差示扫描量热法（DSC）和热重分析（TGA）研究了具有不同聚（甲基）丙烯酸酯的共聚物的玻璃化转变温度，结晶度和热稳定性的共聚物[p（m）]块。结果表明，通过改变P（m）块的链结构和链长来调节共聚物的玻璃化转变温度。此外，通过引入p（m）块来抑制共聚物的结晶，并且可以调整共聚物的韧性。应注意，共聚物的热稳定性依赖于P（m）块的类型和PLLA / P（m）块比。此外，通过原子力显微镜（AFM）和扫描电子显微镜（SEM）观察薄膜中的共聚物的微相分离，结果表明，共聚物的组成显着影响了嵌段共聚物薄膜的表面形态。

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