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首页> 外文期刊>Journal of Applied Polymer Science >Effect of the crystallization conditions on the phase behavior of syndiotactic polystyrene/poly(phenylene oxide) blends
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Effect of the crystallization conditions on the phase behavior of syndiotactic polystyrene/poly(phenylene oxide) blends

机译：结晶条件对间同聚苯乙烯/聚苯醚共混物相行为的影响

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摘要

Syndiotactic polystyrene (sPS) and poly(phenylene oxide) (PPO) blends, miscible in the melt state, were crystallized from the melt and the quenched state at different temperatures. The effect of the crystallization temperature on the phase behavior of the blends and the polymorphic changes in sPS was investigated by dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), and density measurements. In most blends, the crystallization of sPS induced segregation into two homogeneous amorphous phases of different compositions. The temperatures of the DMA relaxations of the neat homopolymers and crystallized blends were fit by the Gordon-Taylor relation to calculate the compositions of these phases. In melt-crystallized blends, with slower crystallization, the major amorphous phase became sPS-rich, whereas the minor phase became PPO-rich. These major and minor amorphous phases could be tentatively assigned to interfibrillar and interlamellar regions, respectively. In cold-crystallized blends, slower crystallization decreased the sPS concentration in both phases, and the scale of segregation was much smaller. WAXD studies and density measurements indicated a complex polymorphic behavior of sPS after it was blended with PPO. (C) 2003 Wiley Periodicals, Inc. [References: 19]
机译：间规聚苯乙烯（sPS）和聚苯醚（PPO）共混物在熔融状态下可混溶，并在不同温度下从熔融状态和淬火状态结晶。通过动态力学分析（DMA），广角X射线衍射（WAXD）和密度测量研究了结晶温度对共混物相行为和sPS中多晶型变化的影响。在大多数掺混物中，sPS的结晶会引起偏析成不同组成的两个均匀无定形相。通过Gordon-Taylor关系式拟合纯净均聚物和结晶共混物的DMA弛豫温度，以计算这些相的组成。在熔融结晶的共混物中，结晶速度较慢，主要的无定形相变得富含sPS，而次要的相变得富含PPO。这些主要和次要非晶态相可以分别暂定为原纤维间和层间区域。在冷结晶共混物中，较慢的结晶降低了两个相中的sPS浓度，并且偏析的规模小得多。 WAXD研究和密度测量表明，sPS与PPO混合后具有复杂的多态性。 （C）2003 Wiley Periodicals，Inc. [参考：19]

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