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首页> 外文期刊>Polymers for advanced technologies >Thermal, physico-mechanical, and morphological properties of HDPE graft-copolymerized with polystyrene
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Thermal, physico-mechanical, and morphological properties of HDPE graft-copolymerized with polystyrene

机译：HDPE与聚苯乙烯接枝共聚的HDPE的热学，物理力学和形态学性质

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In this study, polystyrene was graft-copolymerized onto high-density polyethylene (HDPE) by in situ polymerization of styrene monomer to change the physico-mechanical and thermal properties of HDPE. The grafting was carried out in a Brabender-type static mixer by injecting styrene monomer directly into the molten HDPE in the presence of a free-radical initiator (lauroyl peroxide or LP). The effect of wt% of styrene and initiator concentrations on thermal, physico-mechanical, and morphological properties of HDPE was investigated. The neat and modified HDPE was characterized by differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, and also by tensile strength and contact angle measurements. It was found that the increase in wt% of styrene and LP dosage reduced elongation at break, hygroscopic expansion and also the melting, and the crystallization temperatures of HDPE but increased its tensile strength. The tensile strength was increased from 14.6MPa for the neat HDPE to 20.6MPA for the 10 wt% of styrene grafted onto HDPE using 0.8% LP. Scanning electron microscopy results show that there was no phase separation, and the grafted polystyrene became integral part of HDPE. The results demonstrate that styrene could be used in melt compounding to improve various properties of HDPE. Copyright (C) 2015 John Wiley & Sons, Ltd.
机译：在这项研究中，通过苯乙烯单体的原位聚合将聚苯乙烯接枝共聚到高密度聚乙烯（HDPE）上，以改变HDPE的物理力学和热学性质。接枝反应是在Brabender型静态混合器中进行的，方法是在自由基引发剂（过氧化月桂酰或LP）存在下，将苯乙烯单体直接注入熔融的HDPE中。研究了苯乙烯的重量百分比和引发剂浓度对HDPE的热学，物理力学和形态学特性的影响。通过差示扫描量热法，热重分析，扫描电子显微镜，傅里叶变换红外光谱，扫描电子显微镜以及拉伸强度和接触角测量来表征纯净和改性的HDPE。发现苯乙烯和LP剂量的wt％的增加降低了断裂伸长率，吸湿膨胀以及熔融和HDPE的结晶温度，但是增加了其拉伸强度。拉伸强度从纯HDPE的14.6MPa增加到使用0.8％LP接枝到HDPE上的10 wt％苯乙烯的20.6MPA。扫描电子显微镜结果表明，没有相分离，接枝的聚苯乙烯成为HDPE的组成部分。结果表明，苯乙烯可用于熔融共混以改善HDPE的各种性能。版权所有（C）2015 John Wiley＆Sons，Ltd.

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