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低溫研磨聚合物-能加快聚合物結晶速度

上海漾盟儀器有限公司更新于：2011-11-02

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Abstract Previous comparative studies on the impact of cryogenic mechanical mil領 (CMM) of polymers showed significantly changed thermal and mechanical properties andin 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 mil領 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 paperwas 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 undercoo領. © 2006 Elsevier B.V. All rights reserved. Keywords: Cryogenic mechanical mil領; PVDF; Blends; Crystallization SPEX6770 全自動冷凍研磨機 SPEX6870 全自動冷凍研磨機 SPEX6970EFM 冷凍研磨機

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低溫研磨聚合物-能加快聚合物結晶速度

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