无纺基TPU复合膜的制备及表征

Preparation and Characterization of TPU Composite Membrane Based on Non-Woven Fabrics

为了制备高性能热塑性聚氨酯(TPU)复合材料,利用熔喷纺丝技术制备TPU无纺布,并将其与TPU薄膜通过热压成型技术制备“类三明治”结构的无纺基TPU复合膜,探究成型温度对无纺基TPU复合膜的微观结构、热学性能和力学性能的影响。结果表明:在较高温度(160、165和170℃)下,无纺基TPU复合膜的拉伸强度和弹性模量随成型温度的升高呈现先升高后降低的趋势。当无纺基TPU复合膜的成型温度为165℃,复合膜的拉伸强度和弹性模量与TPU膜相比分别增加24%和43%,应变能密度和断裂伸长率分别增加31%和16%。165℃热压复合时,TPU无纺布与TPU膜相界面结合良好,有利于熔喷纤维网和聚合物基体间的应力传递,提高TPU复合膜的拉伸性能。

In order to prepare high-performance thermoplastic polyurethane(TPU)composite materials,TPU non-woven fabrics were prepared by melt-blown spinning technology,and TPU-based non-woven composite membranes with’sandwich-like’structure were prepared with TPU membrane by thermoforming technology.The effects of molding temperature on microstructure,thermal properties and mechanical properties of non-woven-based TPU composite membrane were investigated.The results show that at higher temperatures(160,165 and 170℃),the tensile strength and elastic modulus of the non-woven-based TPU composites membrane increase first and then decrease with the increasing of the molding temperature.When the forming temperature of the non-woven-based TPU composite membrane is 165℃,the tensile strength and elastic modulus of the composite membrane is increased by 24%and 43%,respectively,compared with the TPU membrane,and the strain energy density and elongation at break is increased by 31%and 16%,respectively.When hot-pressed at 165℃,the interface between the TPU non-woven fabric and TPU membrane is well combined,which is conducive to the stress transfer between the melt-blown fiber web and the polymer matrix,and improves the tensile properties of the TPU composite membrane.