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Gel‐spinning of partially saponificated poly(vinyl alcohol)
Author(s) -
Yamaura Kazuo,
Kumakura Rie
Publication year - 2000
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 - 10.1002/1097-4628(20000923)77:13<2872::aid-app8>3.0.co;2-7
Subject(s) - vinyl alcohol , spinning , materials science , saponification , polymer chemistry , composite material , modulus , methanol , chemistry , polymer , organic chemistry
DMSO/water (80/20 volume ratio) solutions of commercial poly(vinyl alcohol)s ( a ‐PVA 99 , a ‐PVA 88 ) with degrees of saponification of 99.3 and 88 mol % were gel‐spun into methanol (−20 and −70°C). The dry filaments obtained were drawn at 200°C ( a ‐PVA 99 ) and 150–180°C ( a ‐PVA 88 ). The maximum draw ratio and Young's modulus were 26 and 34 GPa for a ‐PVA 99 and 21 and 24 GPa for a ‐PVA 88 (drawing temperature: 160°C). So, at first, the dry filaments obtained for a ‐PVA 88 were drawn at 150–180°C until 10 times their original length. Moreover, the predrawn a ‐PVA 88 filaments were perfectly saponificated under fixing at the both ends and then the filaments were redrawn at 200°C. The maximum draw ratio and Young's modulus for the filaments ( a ‐PVA 88→99 ) predrawn at 150°C were 28 and 39 GPa, respectively. The a ‐PVA 88→99 filaments had two melting peaks (228 and 236°C). © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2872–2876, 2000