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An analysis of capillary water behavior in poly‐ p‐ phenylenebenzobisoxazole fiber
Author(s) -
Kitagawa Tooru,
Yabuki Kazuyuki
Publication year - 2001
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.1186
Subject(s) - differential scanning calorimetry , capillary action , fiber , materials science , crystallization , freezing point depression , polymer , composite material , analytical chemistry (journal) , chemical engineering , polymer chemistry , freezing point , chemistry , thermodynamics , chromatography , physics , engineering
This study concerns with analysis of water inside a poly‐ p ‐phenylenebenzobisoxazole (PBO) fiber. It is important to analyze the state of water attached to polymer, because it may affect properties of fibers as the increase of drying speed of water from the fiber. To carry out such observation, differential scanning calorimetry and nuclear magnetic resonance spectroscopy were applied. They reveal the large freezing point depression and the state of water inside wet PBO fiber. It shows extraordinary low crystallization temperature. The reason may be that the water is packed into capillary voids whose diameter is around 2–3 nm. Proton NMR analysis also suggests the above result. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1030–1036, 2001