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首页> 外文期刊>Journal of Applied Polymer Science >Thermal and mechanical properties of linear low-density polyethylene/low-density polyethylene/low-density polyethylene/wax ternary blends
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Thermal and mechanical properties of linear low-density polyethylene/low-density polyethylene/low-density polyethylene/wax ternary blends

机译：线性低密度聚乙烯/低密度聚乙烯/低密度聚乙烯/蜡三元共混物的热和机械性能

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摘要

The thermal and mechanical properties of uncrosslinked three-component blends of linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), and a hard, paraffinic Fischer-Tropsch wax were investigated. A decrease in the total crystallinity with an increase in both LDPE and wax contents was observed. It was also observed that experimental enthalpy values of LLDPE in the blends were generally higher than the theoretically expected values, whereas in the case of LDPE the theoretically expected values were higher than the experimental values. In the presence of higher wax content there was a good correlation between experimental and theoretically expected enthalpy values. The DSC results showed changes in peak temperature of melting, as well as peak width, with changing blend composition. Most of these changes are explained in terms of the preferred cocrystallization of wax with LL-DPE. Young's modulus, yield stress, and stress at break decreased with increasing LDPE content, whereas elongation at yield increased. This is in line with the decreasing crystallinity and increasing amorphous content expected with increasing LDPE content. Deviations from this behavior for samples containing 10% wax and relatively low LDPE contents are explained in terms of lower tie chain fractions. (c) 2005 Wiley Periodicals, Inc.
机译：研究了线性低密度聚乙烯（LLDPE），低密度聚乙烯（LDPE）和硬质石蜡费托蜡的未交联三组分共混物的热力学性能。随着LDPE和蜡含量的增加，总结晶度降低。还观察到，共混物中LLDPE的实验焓值通常高于理论期望值，而在LDPE的情况下，理论期望值高于实验值。在较高蜡含量的情况下，在实验和理论上预期的焓值之间具有良好的相关性。 DSC结果表明，随着共混物组成的变化，熔融峰温度以及峰宽也发生了变化。这些变化中的大多数是根据蜡与LL-DPE的优选共结晶来解释的。杨氏模量，屈服应力和断裂应力随着LDPE含量的增加而降低，而屈服伸长率则增加。这与随着LDPE含量的增加预期的结晶度的降低和非晶含量的增加是一致的。对于含10％蜡和相对较低LDPE含量的样品，此行为的偏差用较低的键链分数解释。 （c）2005年Wiley Periodicals，Inc.

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