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首页> 外文期刊>RSC Advances >Introduction of stereocomplex crystallites of PLA for the solid and microcellular poly(lactide)/poly(butylene adipate-co-terephthalate) blends
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Introduction of stereocomplex crystallites of PLA for the solid and microcellular poly(lactide)/poly(butylene adipate-co-terephthalate) blends

机译：用于固体和微孔聚（丙交酯）/聚（丁烯己二酸丁二醇酯）共混物的PLA立体络合物晶体的引入

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摘要

Solid and microcellular poly(L-lactide)/poly(butylene adipate-co-terephthalate) (PLLA/PBAT) blends with or without poly(D-lactide) (PDLA) were prepared via melt blending and batch foaming process with supercritical carbon dioxide, respectively. The introduction of PDLA on the rheological properties, crystallization behavior and dynamic mechanical properties of the PLLA matrix were investigated. The formed PLA stereocomplex between PLLA and PDLA enhanced the storage modulus and complex viscosity of PLLA/PBAT blends efficiently. Interestingly, the addition of 5 wt% or 10 wt% PDLA in the PLLA/PBAT blends was unfavorable for the PLLA crystallization behavior. The potential reason can be sc-PLA crystallites acting as the physical crosslinking points, which constrained the molecular mobility of the PLLA matrix and even blocked the nucleating effect of PBAT domains. Both the enhanced melt strength and decreased crystallinity of the PLLA matrix are favorable for the cell nucleation and growth and the gas adsorption, respectively. The designed partially foaming of PLLA/PBAT with or without PDLA was carried out to investigate the foaming mechanism. The final cell morphology of PLLA/PBAT foams exhibited typical open-cell structure mainly attributed to the soft immiscible PBAT phase as separated domains. With further addition of PDLA in the PLLA/PBAT blends, the microcellular morphology exhibited decreased average cell size and increased cell density. The sc-PLA crystallites networks in the PLLA matrix acted as cell nucleating agents, which meanwhile resisted the force of cell growth and then prevented the cell collapse.
机译：通过熔融共混和具有超临界二氧化碳的熔融混合和批量发泡方法，制备具有或不具有聚（D-丙交酯）（PDLA）的固体和微孔聚（L-丙交酯）/聚（丁二醇酯 - 酰基对苯二甲酸酯）（PLLA / PBAT）共混物，具有超临界二氧化碳， 分别。研究了PDLA对PLLA基质的流变性质，结晶行为和动态力学性能的引入。 PLLA和PDLA之间的形成PLA立体络合物增强了PLLA / PBAT的储存模量和有效混合的复粘度。有趣的是，PLLA / PBAT共混物中加入5wt％或10wt％PDLA对于PLLA结晶行为不利。潜在的原因可以是作为物理交联点的SC-PLA微晶，其限制了PLLA基质的分子迁移率，甚至阻断了PBAT结构域的成核作用。 PLLA基质的增强熔体强度和降低的结晶度分别有利于细胞成核和生长和气体吸附。进行或不含PDLA的PLLA / PBAT的设计部分发泡，以研究发泡机制。 PLLA / PBAT泡沫的最终细胞形态表现出典型的开阔细胞结构，主要归因于软不混溶的PBAT相同作为分离结构域。随着PLLA / PBAT共混物中的进一步添加PDLA，微孔形态表现出降低的平均细胞尺寸和增加的细胞密度。 PLLA基质中的SC-PLA微晶网络作用为细胞成核剂，其同时抵抗细胞生长的力，然后防止细胞塌陷。

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  • 来源
    《RSC Advances》 |2018年第22期|共12页
  • 作者

    Shi Xuetao; Qin Jianbin; Wang Long; Ren Liucheng; Rong Fan; Li Daiheng; Wang Ryan; Zhang Guangcheng;

  • 作者单位

    Northwestern Polytech Univ Sch Sci Dept Appl Chem Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Sci Dept Appl Chem Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Sci Dept Appl Chem Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Sci Dept Appl Chem Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Sci Dept Appl Chem Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Sci Dept Appl Chem Xian Shaanxi Peoples R China;

    Total Corb PLA BV Room 903-905 9-F Hongkong Plaza 283 Huaihai M Rd Shanghai 200021 Peoples R China;

    Northwestern Polytech Univ Sch Sci Dept Appl Chem Xian Shaanxi Peoples R China;

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