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首页> 外文会议>International Symposium on Metastable and Nano-Materials(ISMANAM-2005); 20050703-07; Paris(FR) >Accelerated crystal growth in cryogenic mechanically milled polymers and polymer blends
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Accelerated crystal growth in cryogenic mechanically milled polymers and polymer blends

机译：低温机械研磨的聚合物和聚合物共混物中的晶体加速生长

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摘要

Previous comparative studies on the impact of cryogenic mechanical milling (CMM) of polymers showed significantly changed thermal and mechanical properties and-in the case of some polymer blends (e.g., PMMA/PVDF) an improved miscibility. Those changes were mainly attributed to a reduction of the molecular weight average during the milling process. The crystallization process in macromolecular systems is strongly affected by any small change of the initial chain structure like the chain conformation, the presence of branches and of course a decrease of the molecular weight average. Therefore, the aim of this paper was a comparative study of isothermal crystallization of cryogenic mechanically milled and original (unmilled) polymers and polymer blends. The overall crystal growth rates were determined and the development of the spherulitic morphology was studied in detail by means of hot stage polarized light microscopy. Isothermal crystallization of bulk samples was also investigated using differential scanning calorimetry (DSC). The average spherulite growth rates of the milled homo-polymer as well as the blends were significantly higher than in unmilled samples; even when all experiments started from the molten state. Moreover, the increase in crystal growth was almost independent of the chosen crystallization temperature and thus the degree of undercooling.
机译：先前对聚合物的低温机械研磨（CMM）的影响的比较研究表明，热性能和机械性能发生了显着变化，并且在某些聚合物共混物（例如PMMA / PVDF）的情况下，混溶性得到了改善。这些变化主要归因于研磨过程中平均分子量的降低。大分子系统中的结晶过程受初始链结构的任何细微变化（如链构象，支链的存在，当然还有平均分子量的降低）的强烈影响。因此，本文的目的是对低温低温机械研磨和原始（未研磨）聚合物以及聚合物共混物的等温结晶进行比较研究。确定了总体晶体生长速率，并通过热台偏振光显微镜详细研究了球状形态的发展。还使用差示扫描量热法（DSC）研究了大块样品的等温结晶。研磨后的均聚物和共混物的平均球晶生长速率显着高于未研磨的样品。即使所有实验都是从熔融状态开始的。而且，晶体生长的增加几乎与所选择的结晶温度无关，因此与过冷度无关。

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