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首页> 外文期刊>Journal of Applied Polymer Science >Influence of thermal history on crystalline morphologies of isotactic polypropylene in its miscible blends with polybutene-1
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Influence of thermal history on crystalline morphologies of isotactic polypropylene in its miscible blends with polybutene-1

机译：热历史对全同立构聚丙烯与聚丁烯-1混溶共混物结晶形态的影响

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摘要

The miscibility behaviors in blends of isotactic polypropylene (iPP) and polybutene-1 (PB) have been studied using in-situ FTIR imaging. The heterogeneous melt of 3/7 iPP/PB blends were formed at 250, 220, and 180 degrees C and then quenched to the same crystallization temperature of iPP at 125 degrees C, respectively. Evolution processes of composition distribution during crystallization were monitored according to their characteristic peaks, and the results suggest a trend from local concentration to uniform dispersion of PB fraction. Further studies of the PB fraction as the distance from the growth front of iPP spherulite indicate an irreversible phase behavior with the progress of thermal history. The cyclic melting and crystallization favor the mixing of iPP/PB blend. Meanwhile, the nonlinear growth rate of iPP spherulite is mainly responsible for compatible promotion of iPP/PB blend, which hinders the transportation of iPP chains to its growth front. (c) 2015 Wiley Periodicals, Inc.
机译：使用原位FTIR成像技术研究了全同立构聚丙烯（iPP）和聚丁烯1（PB）的混合物中的混溶行为。 3/7 iPP / PB共混物的异质熔体在250、220和180摄氏度下形成，然后分别在125摄氏度下淬火至相同的iPP结晶温度。根据其特征峰监测了结晶过程中组成分布的演变过程，结果表明PB组分从局部浓度到均匀分散的趋势。 PB分数作为距iPP球晶生长前沿距离的进一步研究表明，随着热历史的发展，相行为不可逆。循环熔融和结晶有利于iPP / PB共混物的混合。同时，iPP球晶的非线性生长速率主要负责促进iPP / PB共混物的相容性促进，阻碍了iPP链向其生长前沿的运输。 （c）2015年威利期刊有限公司

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