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A novel method to prepare poly(vinyl alcohol) water‐soluble fiber with narrowly dissolving temperature range
Author(s) -
Wang Bin,
Zhang Fan,
Jiang Mengjin,
Ye Guangdou,
Xu Jianjun
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.36235
Subject(s) - vinyl alcohol , crystallinity , dissolution , materials science , fiber , spinning , chemical engineering , amorphous solid , polymer chemistry , crystallite , polymer , ultimate tensile strength , atmospheric temperature range , synthetic fiber , composite material , organic chemistry , chemistry , engineering , metallurgy , physics , meteorology
Poly(vinyl alcohol) (PVA) is an important water‐soluble polymer. In this study, a novel method has been developed for preparing water‐soluble PVA fiber with narrowly dissolving temperature range via wet spinning of partly acetalized PVA. The structures and properties of the fiber were characterized by IR, 1 H‐NMR, DSC, WAXD, tensile strength tester, etc. IR and NMR spectra showed that acetal groups were successfully generated on the lateral chains of PVA with the catalysis of acid. As a small quantity of CH 2 O was added, the introduction of the acetal group could reduce both the hydrophilicity of amorphous region and the crystallinity of PVA water‐soluble fiber, and hence narrowed the dissolving temperature range of fiber. However, the dissolving temperature range was broadened with a further increase of CH 2 O amount, because of the large decrease of crystallinity and crystallite perfection. When the CH 2 O added amount reached up to 20%, the acetalized PVA was completely insoluble, so that the spinning process could not be carried out. The breaking strengths of most acetalized fibers were beyond 4 cN/dtex, which satisfied the ordinary use of industrial and domestic field. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012