热塑性聚氨酯/低熔点聚酯共混改性及其薄膜的制备与性能研究  

Preparation,morphology,rheology and properties of thermoplastic polyurethane/low melt point polyester blends used as moisture vapor permeable films

作　　者：罗欣[1] 王新锋[2] 汪晓东[2] 

机构地区：[1]中国纺织科学研究院研究开发中心,北京100025 [2]北京化工大学新型高分子材料的制备与加工北京市重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2005年第6期31-35,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：北京市自然科学基金项目(2042022)

摘　　要：通过熔融共混的方法制备Estane热塑性聚氨酯(TPU)和低熔点聚酯的共混物,并吹制成膜。分别对共混体系进行DSC,FTIR,SEM和流变性能以及对薄膜进行剥离强度、透湿量和耐静水压的分析测试。结果表明:TPU与低熔点聚酯具有一定的相容性;TPU中低熔点聚酯质量分数≤30%时,低熔点聚酯能够以细小且规则球形颗粒分布在TPU基体中;低熔点聚酯的加入能够大大提高TPU薄膜的热熔粘合性能,并能显著降低粘合温度,但是会对薄膜的透湿性和耐水压性产生不利影响。试验表明低熔点聚酯质量分数为20%时的TPU薄膜能够满足使用要求。Blends of Estane thermoplastic polyurethane （TPU） and low melt point polyester were prepared via melt blending and the blend films were prepared via blow molding. The morphology, thermal properties and rheology of the blends, and the properties as moisture vapor permeable films were studied. Differential scanning calorimetry （DSC） and Fourier transformed infrared （FTIR） investigation indicated that the hard segments of the TPU was compatible with the low melt point polyester. Scanning electron microscopy （SEM） micrographs exhibited a particle-dispersed type of the morphology, in which the low melt point polyester was finely dispersed as regular spherical particles in the TPU matrix when the content of the low melt point polyester was below 30 %. Evaluations on the properties of the blend films demonstrated that the incorporation of the low melt point polyester could enhance significantly the adhesive strength of the TPU film, but it deteriorated the moisture vapor permeability and the waterproofness. The blend films will still balance the comfort and the laminating processability as long as the content of the low melt point polyester is controlled to an appropriate level, i.e. below 20%.

关 键 词：热塑性聚氨酯 低熔点聚酯 共混 防水透湿薄膜 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]