首页> 外文期刊>Journal of Applied Polymer Science >Multiple Melting and Partial Miscibility of Ethylene-Vinyl Acetate Copolymer/Low Density Polyethylene Blends
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Multiple Melting and Partial Miscibility of Ethylene-Vinyl Acetate Copolymer/Low Density Polyethylene Blends

机译:乙烯-乙酸乙烯酯共聚物/低密度聚乙烯共混物的多重熔融和部分混溶性

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摘要

Multiple melting behaviors and partial miscibility of ethylene-vinyl acetate (EVA) copolymer/low density Polyethylene (LDPE) binary blend via isothermal crystallization are investigated by differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). Crystallization temperature T (degrees C) is designed as 30, 50, 70, 80 degrees C with different crystallization times t (min) of 10, 30, 60, 300, 600 min. The increase of crystallization temperature and time can facilitate the growth in lateral crystal size, and also the shift of melting peak, which means the completion of defective secondary crystallization. For blends of various fractions, sequence distribution Of ethylene segments results in complex multiple melting behaviors during isothermal crystallization process. Overlapping endothermic peaks and drops of equilibrium Melting points of LDPE component extrapolated from Hoffman-Weeks plots clarify the existence of partial miscibility in crystalline region between EVA and LDPE. WAXD results show that variables have no perceptible influence on the predominant existence of orthorhombic crystalline phase Structure.
机译:通过差示扫描量热法(DSC)和广角X射线衍射(WAXD)研究了乙烯-乙酸乙烯酯(EVA)共聚物/低密度聚乙烯(LDPE)二元共混物通过等温结晶的多重熔融行为和部分混溶性。结晶温度T(摄氏度)设计为30、50、70、80摄氏度,不同的结晶时间t(分钟)为10、30、60、300、600分钟。结晶温度和时间的增加可以促进横向晶体尺寸的增长,并且还可以促进熔化峰的移动,这意味着缺陷二次结晶的完成。对于各种馏分的混合物,乙烯链段的序列分布在等温结晶过程中会导致复杂的多重熔融行为。从Hoffman-Weeks图推算出的LDPE组分的重叠吸热峰和平衡滴熔点表明,EVA和LDPE之间的结晶区存在部分混溶性。 WAXD结果表明,变量对正交晶相结构的主要存在没有明显的影响。

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