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Properties of syndiotactic‐rich poly(vinyl alcohol) thin film in water. III. Contraction and extension of drawn and annealed thin film in water
Author(s) -
Yamaura Kazuo,
Matsuzawa Shuji
Publication year - 1986
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.1986.070310717
Subject(s) - vinyl alcohol , annealing (glass) , materials science , thin film , contraction (grammar) , composite material , boiling , polymer chemistry , tacticity , boiling point , chemical engineering , chemistry , organic chemistry , nanotechnology , polymer , polymerization , medicine , engineering
Contraction and extension behaviors in water for drawn (four times original length) and annealed (at 60–215°C) thin films of poly(vinyl alcohol) (PVA VTFA ) derived from vinyl trifluoroacetate have been examined. At a constant temperature of 25°C, drawn films annealed at 60–190°C contracted after a certain standing time. Length of films annealed at 200°C did not change after standing of 20 min and film annealed at 215°C extended very little. As the temperature was raised, the drawn films annealed at 60–190°C contracted further until a certain temperature and then extended. The drawn film annealed at 200°C first started contraction at 70°C. The drawn film annealed at 215°C extended further very little until 75°C and then contracted very little until 99°C (in boiling water). In standing at 99°C, it contracted very little with standing and resisted without breaking for 300 min.