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Effects of Heterogeneous Linear Polyether Segments on the Membrane Breathability of Nonionic Polyurethane
Journal of Macromolecular Science Part B-Physics ( IF 1.4 ) Pub Date : 2021-05-14 , DOI: 10.1080/00222348.2021.1922158
Heng Quan 1, 2 , Zengfeng Wei 1, 2 , Qing Li 1, 2 , Shiwei Li 1, 2 , Lijie Ni 1, 2
Affiliation  

Abstract

Characterizing the relationships between the water repellency and moisture permeability (breathability) of hydrophilic polyurethane and its supramolecular structure, including the phase inversion temperature in the soft phase, is unavoidable when developing intelligent, breathable textile products. In this study, a two-step technique was employed to prepare hydrophilic nonionic polyurethanes (PU) with various polyether (PE) soft segments. The hard segments of the samples were composed of 4,4′-diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BDO), while the soft segments consisted of polyethylene glycol 1000 (PEG), polytetramethylene glycol 1000 (PTMG), or their mixture. The relationships between the chemical and physical structure and the breathability were studied. The results showed that the samples with better separated structure between the soft and hard domains had a special microstructure of partial compatibility and simultaneously partial separation between the polyether soft and hard domains. In addition, the distribution of the mixed polyethers in the soft domains was homogeneous. The microphase structure, especially the hydrophilic ether bond content, exhibited a specific corresponding relevancy to the water resistance, moisture permeability and hydrophilicity of the PU membrane. The moisture permeability and water resistance were also directly related to their film-forming properties. Enhanced microphase separation intensified the positive effects of ether bonds on the moisture permeability, while worsened microphase separation weakened their negative influence on the water resistance/hydrophobicity.



中文翻译:

多相线性聚醚链段对非离子聚氨酯膜透气性的影响

摘要

表征亲水性聚氨酯的防水性和透湿性(透气性)与其超分子结构之间的关系,包括软相中的相转化温度,在开发智能、透气的纺织产品时是不可避免的。在这项研究中,采用两步法制备具有各种聚醚 (PE) 软链段的亲水性非离子聚氨酯 (PU)。样品的硬链段由 4,4'-二苯基甲烷二异氰酸酯 (MDI) 和 1,4-丁二醇 (BDO) 组成,而软链段由聚乙二醇 1000 (PEG)、聚丁二醇 1000 (PTMG) 或他们的混合物。研究了化学和物理结构与透气性之间的关系。结果表明,软硬域分离结构较好的样品具有特殊的微观结构,即部分相容,同时聚醚软硬域部分分离。此外,混合聚醚在软域中的分布是均匀的。微相结构,尤其是亲水性醚键含量,与PU膜的耐水性、透湿性和亲水性表现出特定的对应关系。透湿性和耐水性也与其成膜性能直接相关。增强的微相分离增强了醚键对透湿性的积极影响,

更新日期:2021-05-14
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