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Crystallization of poly(epsilon-caprolactone) in its immiscible blend with polylactide: insight into the role of annealing histories

机译：聚（ε-己内酯）结晶于其不混溶的聚合物与聚丙环酰胺：洞察退火历史的作用

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Polylactide/poly(epsilon-caprolactone) (PLA/PCL) is a very promising blend materialwith biodegradable characteristics and tailorable performance because of the good property complementarity between the two components. However, PLA and PCL are asymmetric thermodynamically: PLA has far higher melting point than PCL, and crystallization temperature of PCL is even lower than glass transition temperature of PLA. But this also provides good opportunity to control final structure and properties of PCL/PLA blends through thermal annealing. In this work, two annealing routes were designed to control supermolecular structure of discrete PLA phase in the PCL-rich blends, and the two systems, the blend with discrete amorphous PLA domains and the one with discrete crystallized PLA phase, were obtained. The interfacial property alteration and crystallization behavior of continuous PCL phase were then studied. The results are very interesting. Relative to the amorphous PLA phase, the crystallized PLA domains have better affinity to the continuous PCL phase, showing stronger nucleating effect to the crystallization of PCL and higher impeding effect on the shear flow of blend system. But the presence of discrete PLA phase, whether in crystallized or amorphous state, has no evident influence on the crystal structure and lamellar thickness of PCL. These effects on the crystallization of PCL make the mechanical properties of blends very sensitive to the annealing histories. The blend sample with the crystallized PLA domains shows higher modulus and strength than the one with the amorphous PLA domains, and the values of modulus and strength increase by about 130% and 43%, respectively, relative to the neat PCL. This work provides a facile and green approach to well tailor the supermolecular structure and mechanical properties of the PCL/PLA blends through the simple control of annealing process.
机译：聚丙烯/聚（ε-己内酮）（PLA / PCL）是一种非常有前景的混合材料，可生物降解的特性，并且由于两种组分之间的良好性能互补性而定制的性能。然而，PLA和PCL是非对称热力学的：PLA比PCL更高的熔点，PCL的结晶温度甚至低于PLA的玻璃化转变温度。但这还提供了控制PCL / PLA混合的最终结构和性能的良好机会，通过热退火。在这项工作中，设计了两个退火途径，以控制富含PCL的共混物​​中的离散PLA相的超分子结构，并获得两个系统，与离散的非晶PLA结构域和具有离散结晶PLA相的混合物。然后研究连续PCL相的界面性质改变和结晶行为。结果非常有趣。相对于无定形PLA阶段，结晶的PLA结构域对连续PCL相具有更好的亲和力，表明对PCL的结晶和对混合物系统的剪切流动的较高的脑部效应具有更强的成核效果。但是，无论是否在结晶或无定形状态下，离散PLA相的存在对PCL的晶体结构和层状厚度没有明显影响。这些对PCL结晶的影响使得共混物对退火历史非常敏感的混合物的机械性能。具有结晶PLA结构域的混合物样品显示出比具有非晶PLA结构域的模量和强度，并且模量和强度分别相对于纯PCl分别增加约130％和43％。这项工作提供了一种易于和绿色的方法，可以通过简单的退火工艺控制来妥善裁缝，通过简单控制来衡量PCL / PLA混合的超分子结构和机械性能。

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  • 来源
    《RSC Advances》 |2016年第44期|共10页
  • 作者

    Lv Qiaolian; Wu Defeng; Xie Hui; Peng Sheng; Chen Yang; Xu Chunjiang;

  • 作者单位

    Yangzhou Univ Sch Chem &

    Chem Engn Yangzhou 225002 Jiangsu Peoples R China;

    Yangzhou Univ Sch Chem &

    Chem Engn Yangzhou 225002 Jiangsu Peoples R China;

    Yangzhou Univ Sch Chem &

    Chem Engn Yangzhou 225002 Jiangsu Peoples R China;

    Yangzhou Univ Sch Chem &

    Chem Engn Yangzhou 225002 Jiangsu Peoples R China;

    Yangzhou Univ Sch Chem &

    Chem Engn Yangzhou 225002 Jiangsu Peoples R China;

    Yangzhou Univ Sch Chem &

    Chem Engn Yangzhou 225002 Jiangsu Peoples R China;

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  • 中图分类 化学;
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