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首页> 外文期刊>RSC Advances >Crystallization induced layer-to-layer transitions in symmetric PEO-b-PLLA block copolymer with synchrotron simultaneous SAXS/WAXS investigations
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Crystallization induced layer-to-layer transitions in symmetric PEO-b-PLLA block copolymer with synchrotron simultaneous SAXS/WAXS investigations

机译：通过同步加速器同时进行SAXS / WAXS研究，在对称PEO-b-PLLA嵌段共聚物中结晶诱导的层间转变

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摘要

The time dependent hierarchical structures and crystallization behaviors of synthetic crystalline-crystalline symmetric diblock copolymer poly(ethylene oxide)-b-polylactide (PEO-b-PLLA) were investigated by DSC and synchrotron simultaneous small-angle/wide-angle X-ray scattering (SAXS/WAXS) measurements with various isothermal crystallization conditions. DSC measurements indicated that both blocks can crystallize and melt independently. Synchrotron SAXS/WAXS results showed that the structures and crystallization behaviors of PLLA and PEO blocks influence each other and the crystallization of both blocks could induce microphase separation into layer-layer structures, however, the crystalline structures of both blocks are not affected. It is assumed that the final structure of the crystalline-crystalline block copolymer is determined by the crystallization behaviors of the blocks rather than the glass transition temperature of the PLLA block and the theoretical microphase structure of the block copolymers.
机译：通过DSC和同步加速器同时进行小角度/广角X射线散射研究了合成晶体-晶体对称的二嵌段共聚物聚（环氧乙烷）-b-聚丙交酯（PEO-b-PLLA）的时间依赖性分层结构和结晶行为（SAXS / WAXS）在各种等温结晶条件下的测量。 DSC测量表明，两个嵌段均可独立结晶和熔化。同步加速器SAXS / WAXS结果表明，PLLA和PEO嵌段的结构和结晶行为会相互影响，并且两个嵌段的结晶都可能引起微相分离为层-层结构，但是，两个嵌段的晶体结构均不受影响。假定结晶-晶体嵌段共聚物的最终结构是由嵌段的结晶行为而不是PLLA嵌段的玻璃化转变温度和嵌段共聚物的理论微相结构决定的。

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