Crystallization behavior of polycarbonate/poly(ethylene oxide) blends studied by DSC
Crystallization behavior of polycarbonate/poly(ethylene oxide) blends studied by DSC
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DOI：
10.1016/j.matlet.2004.11.018
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发表时间：
2005-03
影响因子：
3
通讯作者：
Chaoxu Li;Qingshan Kong;Q. Fan;Yanzhi Xia
中科院分区：
文献类型：
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作者：
Chaoxu Li;Qingshan Kong;Q. Fan;Yanzhi Xia
采用氯仿共溶法制备了聚碳酸酯（PC）与聚环氧乙烷（PEO）的共混物。采用差示扫描量热法（DSC）研究了PEO/PCL共混物的结晶行为，并用Avrami方程进行了分析。它们的相容性不仅通过降低PEO的结晶温度、熔融温度、结晶度和结晶速率来证实，而且通过降低PC的平衡熔融温度来证实。PEO在整个组成范围内诱导PC结晶。在一定的结晶温度下，PC的结晶受PC含量和共混物分子运动性的共同控制，在一定的PEO含量下，PC的熔融温度或熔融焓出现最大值。PC的平衡熔融温度的分析似乎表明，这些共混物的Flory-Huggins相互作用参数可能是依赖于组成。PC可以阻止PEO的结晶过程。随着PC的加入，Avrami指数的增加和PEO结晶速率的降低与PC的稀释作用和共混物分子运动性的降低有关。
Blends of polycarbonate (PC) with poly(ethylene oxide) (PEO), both semicrystalline polymers, were prepared by co-dissolving in chloroform and casting the mixture. Crystallization of PEO/PCL blends was studied by differential scanning calorimetry (DSC) and analyzed by the Avrami equation. Their miscibility was confirmed not only by the decreasing crystallization temperature, melting temperature, crystallinity and crystallization rate of PEO, but also by the equilibrium melting temperature depression of PC. PEO induced the crystallization of PC within the entire composition range. At a predetermined crystallization temperature, the crystallization of PC was controlled by both the PC content and molecular mobility of the blends, which could induce a maximum melting temperature or enthalpy of PC at a certain PEO content. The analysis of the equilibrium melting temperature of PC seemed to show the Flory–Huggins interaction parameter for these blends might be composition-dependent. PC could prevent the crystallization process of PEO. With the addition of PC, the increasing Avrami exponent and the decreasing crystallization rate of PEO were related with the dilute effect of PC and decreasing molecular mobility of the blends.