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首页> 外文期刊>Macromolecules >An in situ SAXS/WAXS/Raman spectroscopy study on the phase behavior of syndiotactic polystyrene (sPS)/solvent systems: Compound formation and solvent (dis)ordering
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An in situ SAXS/WAXS/Raman spectroscopy study on the phase behavior of syndiotactic polystyrene (sPS)/solvent systems: Compound formation and solvent (dis)ordering

机译:间规聚苯乙烯(sPS)/溶剂体系的相行为的原位SAXS / WAXS /拉曼光谱研究:化合物形成和溶剂(无序)

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摘要

In situ small-and nide-angle X-ray scattering (SAXS and WAXS) experiments combined with Raman spectroscopy and thermal analysis have been performed to study the phase behavior of syndiotactic polystyrene (sPS) solutions. Three different solvents were used, respectively, decalin, benzyl methacrylate, and cyclohexyl methacrylate. When sPS solutions are quenched, gel formation occurs. In these gels sPS adopts a helical conformation that is stabilized by the solvent molecules; in fact, compound formation occurs. From the combined experimental data it was concluded that two different structural modifications exist within the solvent-included helical delta-phase, respectively the delta'-phase, in which the solvent molecules are intercalated and ordered between the phenyl rings of sPS, and a delta"-phase, where the solvent ordering is lost. The so-called gamma-phase, the solvent-free helical phase, was not observed in our studies. The transformation from the helical (delta") phase to the planar zigzag (beta) phase occurs via melting and recrystallization. Under specific conditions, the beta-phase is metastable, even in its thermodynamically stable region. [References: 38]
机译:原位小和负角X射线散射(SAXS和WAXS)实验与拉曼光谱和热分析相结合进行了研究,以研究间规聚苯乙烯(sPS)溶液的相行为。使用了三种不同的溶剂,分别是十氢化萘,甲基丙烯酸苄酯和甲基丙烯酸环己酯。当sPS溶液淬灭时,发生凝胶形成。在这些凝胶中,sPS采用一种螺旋构象,该构象被溶剂分子稳定。实际上,会形成化合物。从组合的实验数据得出的结论是,在包含溶剂的螺旋δ相和δ′相中分别存在两种不同的结构修饰,其中溶剂分子插入并排列在sPS的苯环之间,并且δ “相,失去溶剂有序性。我们的研究中未观察到所谓的γ相(无溶剂螺旋相)。从螺旋(δ)相向平面之字形(β)的转变相通过熔融和重结晶发生。在特定条件下,即使在热力学稳定的区域,β相也是亚稳的。 [参考:38]

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