ABSTRACT

Thermoplastic polyurethane elastomers (TPUs) have been intensively used as hot-melt adhesives (HMAs) due to their adherence ability that can be applied on hard surfaces. To overcome their drawbacks, such as low peel strength and deformation, the performance improvement of the TPUs-HMAs has become a challenging issue. In this study, the enhancement properties of the TPUs-HMAs were achieved from the copolymerization of a soft-segment technique. Two types of polycarbonate diols (PCDs) were utilized for the TPU production as a co-diol of the soft segment. The properties and phase behaviour of the TPUs with various ratios of copolymerized soft segment were analysed. The compatibility between the different types of the PCDs is defined by the concentration of the hydrogen bonding interaction between the hard and soft phases and the dimensions of the hard domains. The homogeneous dispersion of the hard domains in the soft phase promotes better stress transfer enhancing the mechanical properties and adhesion properties. The peel strength is measured between the TPUs/stainless steel joint, in which the highest value is accomplished with the formulation of 60:40 wt% of copolymerized soft segment, which is associated with the superior mechanical strength and the optimum compatible properties of the soft segment.

摘要

热塑性聚氨酯弹性体 (TPU) 因其可应用于硬表面的粘附能力而被广泛用作热熔粘合剂 (HMA)。为了克服它们的缺点，例如低剥离强度和变形，TPU-HMA 的性能改进已成为一个具有挑战性的问题。在这项研究中，TPUs-HMA 的增强性能是通过软段技术的共聚实现的。两种类型的聚碳酸酯二醇 (PCD) 作为软段的共二醇用于 TPU 生产。分析了具有不同共聚软链段比例的 TPU 的性能和相行为。不同类型 PCD 之间的相容性由硬相和软相之间氢键相互作用的浓度和硬域的尺寸定义。软相中硬域的均匀分散促进了更好的应力传递，从而增强了机械性能和粘合性能。剥离强度是在 TPUs/不锈钢接头之间测量的，其中最高值是在 60:40 wt% 共聚软链段的配方中实现的，这与柔软的机械强度和最佳相容性有关。部分。