摘要
研究了具有不同分子链形态PVA纤维的轴向压缩变形结构 .结果表明 ,在具有带状结构的PVA纤维中 ,带状结构对纤维的轴向压缩变形行为有很大影响 .压缩变形后纤维中的带状结构仍然存在 ,但带状结构内的分子链与纤维轴发生倾斜 ,随压缩变形程度增大 ,在有利剪切应力发展的方向形成褶皱变形带 ,最后导致纤维中所有带状结构破坏 .X光衍射实验结果表明 ,对于具有带状结构的PVA纤维 ,( 1 0 1 ) [0 1 0
The influence of supermolecular structures on the axial compressional behavior of poly (vinyl alcohol) (PVA) fibers was investigated. Two kinds of PVA fibers with different the morphological structure of molecular chains, PVA-H fiber and PVA-B fiber were studied. PVA-H fiber with a long-period structure that is made up of stacked folded-chain crystals has a homogeneous appearance, while PVA-B fiber with extended-chain crystals has a characteristic banded structure. The axial deformation behavior of PVA-B fibers was quite different from that of PVA-H fibers. When the PVA-B fibers were axially compressed, the PVA molecules in,the banded structure were considerably kinked in zigzag fashion from band to band to form deep 'crease'. Finally, all banded structures in the fiber were destroyed. It is suggested that (101) [010] slip plays an important role in the deformation of the PVA-B fibers.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2002年第6期791-794,共4页
Acta Polymerica Sinica
