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首页> 外文会议>International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials(ISMANAM 2003); 20030824-20030828; Foz do Lguacu; BR >Cryogenic Mechanical Milling of Syndiotactic Polystyrene (sPS)
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Cryogenic Mechanical Milling of Syndiotactic Polystyrene (sPS)

机译：间规聚苯乙烯（sPS）的低温机械研磨

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摘要

The influence of Cryogenic Mechanical Milling (CMM) on the structure and thermal behavior of sPS was investigated by means of X-ray diffraction, differential scanning calorimetry and fourier transformed infrared spectroscopy. It was shown that increasing milling time leads to a significant broadening of the X-ray diffraction peaks accompanied by the formation of a "cold crystallization" peak during the DSC heating cycles. Moreover CMM causes a decrease in the degree of crystallinity and it is supposed that CMM transforms the initial semi-crystalline morphology into a "nano-structured" one consisting of small "fragments" of the original sPS lamellae. Some of the results presented indicate that the structural changes are only partly reversible. After recrystallization from the molten state, there still exists an influence of the previous milling treatment resulting in a significantly changed crystallization behavior. Possible reasons, e.g. a reduction of the molecular weight or molecular weight distribution, will be discussed in detail.
机译：通过X射线衍射，差示扫描量热法和傅立叶变换红外光谱等方法研究了低温机械铣削（CMM）对sPS结构和热行为的影响。结果表明，增加研磨时间会导致X射线衍射峰显着加宽，并在DSC加热周期中形成“冷结晶”峰。而且，CMM导致结晶度的降低，并且认为CMM将初始的半晶体形态转变为“纳米结构”，其由原始sPS薄片的小“碎片”组成。提出的一些结果表明结构变化仅是部分可逆的。从熔融态重结晶后，仍然存在先前研磨处理的影响，导致显着改变的结晶行为。可能的原因，例如将详细讨论降低分子量或分子量分布的方法。

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