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Phase separation kinetics of rigid‐rod polymers during coagulation
Author(s) -
Nelson Donald S.,
Soane David S.
Publication year - 1993
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760332406
Subject(s) - spinodal decomposition , materials science , kinetics , coagulation , polymer , methanesulfonic acid , phase (matter) , light scattering , transmittance , polymerization , turbidity , chemical engineering , scattering , polymer chemistry , analytical chemistry (journal) , optics , composite material , chromatography , chemistry , organic chemistry , psychology , physics , oceanography , optoelectronics , engineering , quantum mechanics , psychiatry , geology
Kinetics of phase separation of poly(p‐phenylenebenzobisoxazole) (PBO) in methanesulfonic acid are examined by the time‐resolved small angle light scattering and turbidity measurements. Thin films of polymer solutions are spin‐coated on microscope slides and observed in a controlled environment light scattering cell. These solutions appear to undergo a spinodal decomposition‐like phase separation, following Cahn‐Hilliard type phase separation kinetics upon exposure to water vapor. An exponential increase in the scattered light intensity at short times is found. Transmittance measurements are used to determine the effects of molecular weight and coagulation medium on the rate of coagulation.