Morphology prediction and the effect of core‐shell structure on the rheological behavior of PP/EPDM/HDPE ternary blends
Morphology prediction and the effect of core‐shell structure on the rheological behavior of PP/EPDM/HDPE ternary blends
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DOI：
10.1002/pen.22021
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发表时间：
2011-12
影响因子：
3.2
通讯作者：
Lan-peng Li;B. Yin;Ming‐bo Yang
中科院分区：
文献类型：
--
作者：
Lan-peng Li;B. Yin;Ming‐bo Yang
研究了聚丙烯（PP）/三元乙丙橡胶（EPDM）/高密度聚乙烯（HDPE）70/20/10共混物的形态结构，并与铺展系数和最小自由能模型的预测结果进行了比较。通过对动态储能模量的实验数据进行Palierne理论拟合，得到了PP/HDPE、PP/EPDM和HDPE/EPDM共混体系的界面张力。预测结果表明，PP基体中存在核壳结构（HDPE为核，EPDM为壳）。分别采用直接挤出法和侧向注射法制备了PP/EPDM/HDPE共混物。直接挤出可得到与预测形态相对应的核-壳结构（HDPE为核，EPDM为壳）。侧向注射法可以有效控制PP/EPDM/HDPE共混物的形态结构。采用侧向注射法制备的PP/EPDM/HDPE共混物中，HDPE和EPDM在PP基体中是独立分散的。结果表明，两种方法制备的PP/EPDM/HDPE共混物的不同形态表现出不同的流变行为。当共混物出现核壳结构（HDPE为核，EPDM为壳）时，EPDM壳对HDPE核的变形有明显的限制作用，分散相界面能对共混物储能模量的贡献在低频区减弱。Polym.工程科学，2011.© 2011年塑料工程师协会
In this work, the morphologies of polypropylene (PP)/ethylene-propylene-diene (EPDM) rubber/high density polyethylene (HDPE) 70/20/10 blends were studied and compared with the predictions of the spreading coefficient and minimum free energy models. The interfacial tension of PP/HDPE, PP/EPDM, and HDPE/EPDM blends were obtained by fitting the experimental dynamic storage modulus data to Palierne's theory. The prediction results showed core-shell morphology (core of HDPE and shell of EPDM) in PP matrix. The PP/EPDM/HDPE blends were respectively prepared by direct extrusion and lateral injection method. Core-shell morphology (core of HDPE and shell of EPDM) could be obtained with direct extrusion corresponding to the predicted morphology. The morphology of PP/EPDM/HDPE blends could be effectively controlled by lateral injection method. For PP/EPDM/HDPE blend prepared by lateral injection method, HDPE and EPDM phase were dispersed independently in PP matrix. It was found that the different morphology of PP/EPDM/HDPE blends prepared by two methods showed different rheological behavior. When the core-shell morphology (core of HDPE and shell of EPDM) appeared, the EPDM shell could confine the deformation of HDPE core significantly, so the interfacial energy contribution of dispersed phase on the storage modulus of blends would be weaken in the low frequency region. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers