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Effect of storage on film‐formation property of vinylidene chloride‐acrylonitrile‐methyl acrylate terpolymer latex
Author(s) -
Kodani Takahiko,
Sakai Hideki,
Takayama Atsuko,
Nomura Mamoru
Publication year - 1998
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/(sici)1097-4628(19980718)69:3<573::aid-app17>3.0.co;2-u
Subject(s) - crystallinity , acrylonitrile , materials science , polymer , polymer chemistry , acrylate , methyl acrylate , butyl acrylate , copolymer , polymerization , vinyl chloride , chemical engineering , composite material , engineering
Latex prepared from 91 : 5 : 4 wt % vinylidene chloride‐acrylonitrile‐methyl acrylate monomer mixture by seeded semicontinuous emulsion polymerization was investigated for a change in minimum film‐formation temperature (MFFT) during storage, with focus placed on polymer crystallinity in the dispersed state. MFFT rose from 20°C to 32°C, with storage at 20°C for 49 weeks. Infrared absorption of fresh and stored latexes in the dispersed state indicated an increase in absorbance at 1048 cm −1 , which is characteristic of a crystalline vinylidene chloride polymer, that correlated with the MFFT rise with storage. This suggested that the MFFT rise with storage was caused by increasing crystallinity of the polymer in the dispersed state. X‐ray wide‐angle diffraction and infrared absorption of powder polymers obtained by lyophilization of fresh and stored latexes also indicated increasing crystallinity with latex storage. Oxygen gas permeabilities of films coated with fresh and stored latexes were measured. Latex stored for long periods exhibited poor barrier property, indicating that such latex is unsuitable as an industrial barrier coating material for films and papers. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 573–579, 1998