Morphology and properties of PP/EPDM binary blends and PP/EPDM/nano‐CaCO3 ternary blends
Morphology and properties of PP/EPDM binary blends and PP/EPDM/nano‐CaCO3 ternary blends
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DOI：
10.1002/app.34536
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发表时间：
2012-01
影响因子：
3
通讯作者：
L. Gong;B. Yin;Lan-peng Li;Ming‐bo Yang
中科院分区：
文献类型：
--
作者：
L. Gong;B. Yin;Lan-peng Li;Ming‐bo Yang
本文研究了聚丙烯(PP)/乙丙二烯三元共聚物（EPDM）二元共混物和PP/EPDM/碳酸钙纳米颗粒（纳米caco3）三元共混物的形态、结晶和流变行为。采用直接挤出法和两步挤出法制备了PP/EPDM/CaCO3共混物。采用扫描电镜（SEM）、差示扫描量热仪（DSC）和动态流变仪表征了EPDM和纳米CaCO3对PP/EPDM共混物和PP/EPDM/CaCO3共混物相形貌和性能的影响。EPDM的加入提高了PP/EPDM共混物的结晶度和结晶温度，但随着EPDM用量的增加，结晶度和结晶温度保持不变。随着EPDM含量的增加，PP分子链的迁移性减弱。与直接挤出共混相比，两步挤出共混的基体中分散的纳米碳酸钙更少、更细。因此，基体中纳米caco3的增加导致两步挤出共混物结晶度和结晶温度的增加较弱，tanδ曲线的平台较晚。©2011 Wiley期刊公司高分子学报，2011
In this article, the morphology, crystallization, and rheological behaviors of polypropylene (PP)/ethylene-propylene-diene terpolymer (EPDM) binary blend and PP/EPDM/calcium carbonate nanoparticles (nano-CaCO3) ternary blend were investigated. Two processing methods, i.e., direct extrusion and two-step extrusion, were employed to prepare the PP/EPDM/CaCO3 blend. The influence of EPDM and nano-CaCO3 respectively on phase morphology and properties of PP/EPDM blend and PP/EPDM/CaCO3 blend were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and dynamic rheometer. The crystallinity and crystallization temperature of PP/EPDM blend were improved in comparison to pure PP due to addition of EPDM, but kept invariable with the increased EPDM loading. As the EPDM content was increased, the mobility of PP molecular chains was weakened. Compared with direct extruded blend, less and finer nano-CaCO3 was dispersed in matrix of two-step extruded blend. Accordingly, the increased nano-CaCO3 in matrix gave rise to a weaker increment in crystallinity and crystallization temperature of two-step extruded blend, and a later platform of tanδ curve. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011