The solid-state structure of syndiotactic polystyrene (s-PS) after crystallization from the melt and the glassy state was examined by differential scanning calorimetry (DSC), density, and X-ray diffraction analysis. It was possible to prepare semicrystalline s-PS containing either the pure alpha- or the pure P-crystalline form by melt crystallizing s-PS from 280 or 330degreesC. The measurements confirmed the low density of both crystalline forms, which in the case of alpha-crystalline form was smaller and in the case of beta-crystalline form was only slightly larger than the density of the glassy amorphous s-PS. An endeavor to introduce the crystalline phase in s-PS through cold crystallization at constant temperature above the glass transition resulted in a complex ordered phase. This ordered phase, depending on the crystallization temperature, contained the planar chain mesomorphic phase and the alpha-crystalline phase with a low degree of perfection (cold crystallization in the range 120-175degreesC) or a mixture of the aand beta-crystalline forms with a high degree of perfection (cold crystallization in the range 210-260degreesC). The combination of DSC and X-ray measurements enabled us to resolve the complex ordered structure in semicrystalline s-PS after cold crystallization. (C) 2002 John Wiley Sons, Inc. [References: 19]
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机译：通过差示扫描量热法（DSC），密度和X射线衍射分析检查从熔体结晶后的间规聚苯乙烯（s-PS）的固态结构和玻璃态。通过从280或330℃熔融结晶s-PS，可以制备含有纯α-或纯P-晶形式的半结晶s-PS。测量结果证实了两种结晶形式的低密度，在α-结晶形式的情况下较小，而在β-结晶形式的情况下仅比玻璃态无定形s-PS的密度稍大。通过在高于玻璃化转变温度的恒定温度下通过冷结晶在s-PS中引入结晶相的努力导致了复杂的有序相。根据结晶温度，该有序相包含平面链的同晶相和完美度较低的α-结晶相（冷结晶范围为120-175℃）或α和β结晶形式与α的混合物。完美度高（在210-260℃范围内的冷结晶）。 DSC和X射线测量的结合使我们能够解决冷结晶后半结晶s-PS中复杂的有序结构。 （C）2002 John Wiley Sons，Inc. [参考：19]
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