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首页> 外文期刊>Journal of Applied Polymer Science >Nonisothermal Crystallization Kinetics of Ethylene-Butene Copolymer/Low-Density Polyethylene Blends
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Nonisothermal Crystallization Kinetics of Ethylene-Butene Copolymer/Low-Density Polyethylene Blends

机译：乙烯-丁烯共聚物/低密度聚乙烯共混物的非等温结晶动力学

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摘要

Nonisothermal crystallization kinetics of the blends of three ethylene-butene copolymers with LDPE was studied using differential scanning calorimetry (DSC) and kinetic parameters such as the Avrami exponent and the kinetic crystallization rate (Z_c) were determined. It was found that the pure components and the blends have similar Avrami exponents, indicating the same crystallization mechanism. However, the crystallization rate of the blends was greatly influenced by LDPE. The Z_c of all the blends first increases with increasing LDPE content in the blends and reaches its maximum, then descends as the LDPE content further increases. The crystallization rate also depends on the short-chain branching distribution (SCBD) of the ethylene-butene copolymers. The Z_c of the pure component with a broad SCBD is smaller, but its blends have a larger crystallization rate due to losing highly branched fractions after blending with LDPE.
机译：使用差示扫描量热法（DSC）研究了三种乙烯-丁烯共聚物与LDPE的共混物的非等温结晶动力学，并确定了动力学参数（如Avrami指数）和动力学结晶速率（Z_c）。发现纯组分和共混物具有相似的Avrami指数，表明相同的结晶机理。然而，共混物的结晶速率受LDPE的影响很大。所有共混物的Z_c首先随着共混物中LDPE含量的增加而增加，并达到最大值，然后随着LDPE含量的进一步增加而降低。结晶速率还取决于乙烯-丁烯共聚物的短链支化分布（SCBD）。具有宽SCBD的纯组分的Z_c较小，但由于与LDPE混合后失去了高度支化的级分，因此其共混物的结晶速率较大。

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