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首页> 外文期刊>Journal of Applied Polymer Science >Binary mixtures of polyethylene and oxidized wax: Dependency of thermal and mechanical properties upon mixing procedure
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Binary mixtures of polyethylene and oxidized wax: Dependency of thermal and mechanical properties upon mixing procedure

机译：聚乙烯和氧化蜡的二元混合物：混合过程对热和机械性能的依赖性

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The influence of the preparation procedure on the thermal and mechanical properties of linear low-density polyethylene (LLDPE)- and LDPE-oxidized wax blends was investigated. It was found that mechanically mixed blends show reduced thermal stability as well as ultimate mechanical properties (stress and strain at break) compared to that of extrusion mixed blends. However, the structure of the blend and consequently its thermal and mechanical behavior also depend on the initial morphology of polyethylene. DSC measurements show miscibility up to high wax contents in both blend types, but increasing the amount of wax in LDPE blends induces increasing crystallinity. As a result, the LDPE/wax blends show improved thermal stability of between 20 and 50degreesC at low wax concentrations. Although the elasticity modulus of the blends increases, increasing the amount of wax generally degrades the mechanical properties. The main reason for this is the reduced number of tie chains. Changes in the average concentration of tie chains with increasing wax content were calculated and a correlation was made with the ultimate properties of the blends. (C) 2003 Wiley Periodicals, Inc. [References: 17]
机译：研究了制备方法对线性低密度聚乙烯（LLDPE）和LDPE氧化蜡共混物的热力学性能的影响。发现与挤出混合共混物相比，机械混合共混物显示出降低的热稳定性以及最终的机械性能（断裂应力和应变）。但是，共混物的结构以及因此的热和机械性能也取决于聚乙烯的初始形态。 DSC测量表明，两种共混物类型中的蜡含量均高，但具有互溶性，但LDPE共混物中蜡含量的增加会导致结晶度的提高。结果，在低蜡浓度下，LDPE /蜡共混物显示出改善的热稳定性，介于20至50摄氏度之间。尽管共混物的弹性模量增加，但是增加蜡的量通常会降低机械性能。主要原因是领带链数量减少。计算出随着蜡含量的增加，连接链平均浓度的变化，并与共混物的最终性能相关。 （C）2003 Wiley Periodicals，Inc. [参考：17]

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