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首页> 外文期刊>e-Polymers >Coalescence during annealing of quiescent immiscible polymer blends
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Coalescence during annealing of quiescent immiscible polymer blends

机译：静态不混溶聚合物共混物退火过程中的聚结

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摘要

Coalescence during annealing of quiescent immiscible polymer blends, containing polypropylene (PP) matrix and different amount of ethylene-propylene copolymer (EPR) as dispersed phase, was studied. Comparison of experimental results with available coalescence theories revealed that changes in the phase structure after 20 min annealing can be precisely estimated using the approximate theory of coalescence induced by van der Waals forces and considering drainage of the matrix film between spherical droplets. All results evidenced growth of the EPR droplet size with the annealing time and temperature; increase in the content of dispersed phase contributed to higher growth rate of the dispersed phase, more pronounced at the coalescence origin. Anisometry of the EPR droplets and droplet shape relaxation were perceived, both interfering the course of coalescence. Enhanced elasticity of examined blends at low frequencies and positive deviation of the complex viscosity from the linear mixing rules was observed.
机译：研究了包含聚丙烯（PP）基体和不同数量的乙烯-丙烯共聚物（EPR）作为分散相的静态不溶混聚合物共混物退火过程中的聚结情况。将实验结果与可用的聚结理论进行比较，发现可以使用范德华力诱发的聚结近似理论并考虑球形液滴之间的基体膜排水，来精确估算20分钟退火后的相结构变化。所有结果表明，EPR液滴尺寸随退火时间和温度的增加而增加。分散相含量的增加有助于分散相的较高生长速率，这在聚结起点处更为明显。感知到EPR液滴的等距线法和液滴形状松弛，都干扰了聚结的过程。在低频下观察到的共混物的弹性增强，并且复数粘度与线性混合规则呈正偏差。

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