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首页> 外文期刊>Journal of Applied Polymer Science >Effect of interfacial stress on the crystalline structure of the matrix and the mechanical properties of high-density polyethylene/CaCo3 blends
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Effect of interfacial stress on the crystalline structure of the matrix and the mechanical properties of high-density polyethylene/CaCo3 blends

机译：界面应力对基体晶体结构和高密度聚乙烯/ CaCo3共混物力学性能的影响

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摘要

A series of high density polyethylene (HDPE)/ CaCO3 blends were prepared with different kinds of coupling agents, with CaCO3 particles of different sizes, and with matrixes of different molecular weights during the melt-mixing of HDPE and CaCO3 particles. The mechanical properties of these blends and their dependence on the interfacial adhesion and matrix crystalline structure were studied. The results showed that the Charpy notched impact strength of these blends could be significantly improved with an increase in the interfacial adhesion or matrix molecular weight or a decrease in the CaCO3 particle size. When a CaCO3 surface was treated with a compounded coupling agent, the impact strength of the HDPE/CaCO3(60/40) blend was 62.0 kJ/m(2) 2.3 times higher than that of unimproved HDPE; its Young's modulus was 2070 MPa, 1.07 times higher than that of unimproved HDPE. The heat distortion temperature of this blend was also obviously improved. The improvement of the mechanical properties and the occurrence of the brittle-tough transition of these blends were the results of a crystallization effect induced by the interfacial stress. When the interfacial adhesion was higher and the CaCO3 content was greater than 30%, the interfacial stress produced from matrix shrinkage in the blend molding process could strain-induce crystallization of the matrix, leading to an increase in the matrix crystallinity and the formation of an extended-chain (or microfibrillar) crystal network. The increase in the critical ligament thickness with an increasing matrix molecular weight was attributed to the strain-induced areas becoming wider, the extended-chain crystal layers becoming thicker, and the interparticle distance that formed the extended-chain crystal network structure becoming larger with a higher matrix molecular weight. The formation of the extended-chain crystal network and the increase in the matrix crystallinity were also the main reasons that Young's modulus and the heat distortion temperature of this blend were improved. (C) 2003 Wiley Periodicals, Inc. [References: 23]
机译：在HDPE和CaCO3颗粒的熔融混合过程中，用不同种类的偶联剂，不同尺寸的CaCO3颗粒和不同分子量的基质制备了一系列高密度聚乙烯（HDPE）/ CaCO3混合物。研究了这些共混物的机械性能及其对界面粘合性和基体晶体结构的依赖性。结果表明，随着界面粘合力或基体分子量的增加或CaCO3粒径的减小，这些混合物的夏比缺口冲击强度可以得到显着改善。当用复合偶联剂处理CaCO3表面时，HDPE / CaCO3（60/40）共混物的冲击强度为62.0 kJ / m（2），比未经改进的HDPE高2.3倍;其杨氏模量为2070 MPa，比未经改良的HDPE高1.07倍。该混合物的热变形温度也明显提高。这些共混物的机械性能的改善和脆韧过渡的出现是界面应力引起的结晶作用的结果。当界面粘合性较高且CaCO3含量大于30％时，在共混成型过程中由基体收缩产生的界面应力会应变-诱导基体结晶，从而导致基体结晶度增加并形成基体。延伸链（或微原纤维）晶体网络。随着基质分子量的增加，临界韧带厚度的增加归因于应变诱导的区域变宽，延伸链晶体层变厚，以及形成延伸链晶体网络结构的粒子间距离变大。较高的基质分子量。延长链晶体网络的形成和基体结晶度的增加也是改善该共混物的杨氏模量和热变形温度的主要原因。 （C）2003 Wiley Periodicals，Inc. [参考：23]

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