Mechanical characterization of toughened polyamide‐6 blends with metallocene copolymers
Mechanical characterization of toughened polyamide‐6 blends with metallocene copolymers
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DOI：
10.1002/app.27459
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发表时间：
2008-03
影响因子：
3
通讯作者：
S. López-Quintana;C. Rosales;I. Gobernado-Mitre;J. Merino;J. M. Pastor
中科院分区：
文献类型：
--
作者：
S. López-Quintana;C. Rosales;I. Gobernado-Mitre;J. Merino;J. M. Pastor
研究了两种原位马来酸化茂金属共聚物（茂金属聚乙烯（mPE 1）和茂金属乙烯-丙烯共聚物（mEPDM））和三种商品马来酸化共聚物（mPE 2-g-MA、EPDM-g-MA和mEPR-g-MA）在以聚酰胺-6（PA）为基体（80wt%）的啮合同向双螺杆挤出机中进行的二元和三元共混物中作为抗冲改性剂的有效性。研究了接枝率、粘度比和分散相结晶度对共混物形态和力学性能的影响。FTIR光谱、毛细管流变仪和扫描电子显微镜（SEM）显示，在所有反应性共混物中，这些接枝共聚物与PA 6的相容性显著改善。mEPR-g-MA/PA 2二元共混物的拉伸强度值显示出最高的应变硬化。在这项工作中得到的结果表明，作为抗冲改性剂的接枝共聚物的有效性取决于共混物的形态和共混物组分的拉伸性能的组合，如杨氏模量，泊松比，和断裂应力。© 2007 Wiley Periodicals，Inc.应用聚合物科学杂志，2008年
The effectiveness as impact modifier of two in situ maleated metallocene copolymers, a metallocene polyethylene, (mPE1) and a metallocene ethylene-propylene (mEPDM) and three commercial maleated copolymers (mPE2-g-MA, EPDM-g-MA, and mEPR-g-MA) were studied in binary and ternary blends carried out in an intermeshing corotating twin-screw extruder with polyamide-6 (PA) as matrix (80 wt %). Also, the effects of the grafting degree, viscosity ratio, and crystallinity of the dispersed phases on the morphological and mechanical properties of the blends were investigated. A significant improvement of the compatibility of these grafted copolymers with PA6 was shown by FTIR spectroscopy, capillary rheometry, and scanning electron microscopy (SEM) in all reactive blends. The tensile strength values of the mEPR-g-MA/PA2 binary blend showed the highest strain hardening. The results obtained in this work indicated that the effectiveness of the grafted copolymers as impact modifier depends on the morphology of the blends and a combination of tensile properties of the blend components such as Young's modulus, Poisson ratio, and break stress. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008