共混聚丙烯腈纤维结构的研究

<正> 近年来,采用高聚物共混的方法生产多孔吸水性聚丙烯腈纤维受到人们普遍地重视。纤维内部微孔的数量及孔径分布与纤维许多性能有关,例如,吸水性、渗透性及机械性能等等。因此,研究纤维多孔结构与性能的关系也引起了人们的兴趣。对于双组分共混聚丙烯腈纤维,其结构可以分为三个层次:超分子结构、形态结构以及相态结构,然而,对共混聚丙烯腈纤维结构的研究,报道较少,本文对所研制的几种共混吸水性聚丙烯腈纤维作了初步探讨。     

CHARACTERIZATION OF BLEND ACRYLIC FIBER''''S STRUCTURES

The fine structures, paracrystal, porous and phase structures of blend acrylic fibers have bencharacterized using techniques based on X-ray diffraction, gas adsorption, density, electron and opticalmicroscopy, mercury penetration method and IR spectroscopic analysis. The existence of a fibril-void structure, with voids and fibrils of the order of 10~2.to 10~3A diameter has been confirmed for thewet-spun blend fibers. It was found that the blend acrylic fiber in the present work is a kind of ma-trix-fibril fiber; phase separation takes place in it. Further studies about the effects of composition andsequence distribution of copolymers on structure of the blend fibers were made; and it was discoveredthat void volume in the blend fibers largely depends on the interface area between two polymer phases,and pore size and number on the particle size and number of the dispersing phase. An appropriatestructural model about the blend fibers has been described.