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首页> 外文期刊>Journal of Applied Polymer Science >Thermal bonding of nonwovens as simulated by polypropylene films: Effect of time, temperature, and molecular weight
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Thermal bonding of nonwovens as simulated by polypropylene films: Effect of time, temperature, and molecular weight

机译：聚丙烯薄膜模拟的无纺布的热粘合：时间，温度和分子量的影响

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Many nonwoven fabrics are made by melt spinning semicrystalline fibers followed by thermal bonding using heated calendar rolls. In this work, we have studied thermal bonding of polypropylene films to simulate bonding of nonwoven fibers. We have tried to relate the thermal bond strengths with the concepts of chain dynamics via interfacial adhesion development at symmetric polymer interfaces. This requires relating the microscopic dynamics of chains with macroscopic interfacial adhesion measurements. It was found that the interfacial bond strength was proportional to the fraction of the crystals melted. This required heating the interfacial region between the polymer layers into the melting region. Bond strengths were also related to process time as t ~(1/2). This dependence is consistent with the literature for reptation, but is also due to the required thermal diffusion to bring the interfacial region to the bonding temperature. Finally, the bond strength is also dependent on the polymer molecular weight as 1/M~(1/2), which is consistent with forming the bonds via chain reptation, provided that the bonding time is less than the reptation time.
机译：许多非织造织物是通过熔融纺丝半结晶纤维，然后使用加热的压延辊进行热粘合而制成的。在这项工作中，我们研究了聚丙烯薄膜的热粘合以模拟非织造纤维的粘合。我们试图通过对称聚合物界面处的界面粘合发展将热粘合强度与链动力学概念联系起来。这需要将链的微观动力学与宏观界面粘附力测量联系起来。发现界面结合强度与熔融晶体的分数成比例。这需要将聚合物层之间的界面区域加热到熔融区域中。粘结强度也与处理时间相关，为t〜（1/2）。这种依赖关系与文献有关，但也归因于使界面区域达到键合温度所需的热扩散。最后，结合强度还取决于聚合物分子量1 / M〜（1/2），这与通过链复制形成键相一致，前提是结合时间小于复制时间。

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