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本文研究聚酯(PET)和含3.5-二甲酸苯磺酸钠(SIPM)结构单元的改性共聚酯(PEI)的共混体系。差示扫描量热分析,X射线衍射分析,染色后的透射和扫描电镜照片等均表明该体系是一个热力学不相溶的体系。在加工成形过程中,特别是在结晶过程中,富PEI相中的SIPM结构单元被排斥在晶格之外形成集簇形态,利用这种相分离的结构形态以及改性共聚酯优先水解的机理,PET/PEI共混纤维经碱水解处理后可制得微孔型的高吸水吸湿纤维。本文讨论了相分离结构对该微孔型纤维的微孔尺寸分布,吸湿保水性能以及纤维力学性能的影响。
In this paper, the blend system of polyester (PET) and modified copolyester (PEI) containing structural units of sodium benzenesulfonate 3.5 (SIPM) was studied. Differential scanning calorimetry, X-ray diffraction analysis, transmission and SEM images after dyeing show that the system is a thermodynamically immiscible system. In the process of forming, especially in the crystallization process, the SIPM structural units in the PEI-rich phase are excluded from the lattice to form a clustered morphology. With this phase separation structure and the modified copolyester preferentially hydrolyzed Mechanism, PET / PEI blend fibers can be obtained after alkali hydrolysis microporous high absorbent moisture absorption fiber. In this paper, the influence of phase separation structure on the pore size distribution, moisture retention and water retention, as well as the fiber mechanical properties of the microporous fibers are discussed.