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Investigation and gas permeability of polyurethane complexes
Author(s) -
Huang ShihLiang,
Chao MinShiun,
Lai JuinYih
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(19980131)67:5<865::aid-app12>3.0.co;2-n
Subject(s) - fourier transform infrared spectroscopy , thermogravimetric analysis , polymer chemistry , differential scanning calorimetry , polybutadiene , hydrogen bond , polyurethane , materials science , ionic bonding , permeability (electromagnetism) , chemical engineering , chemistry , membrane , polymer , composite material , ion , organic chemistry , molecule , copolymer , thermodynamics , engineering , biochemistry , physics
Ionic polyurethane (PU) membranes of hydroxyl‐terminated polybutadiene (HTPB) and 4,4′‐dicyclohexylmethane diisocyanate (H 12 MDI) were polymerized by a two‐stage method. The ionic group was introduced by adding N ‐methyldiethanolamine (MDEA) as the chain extender of which the tertiary amines were complexed with cobalt ions. It was found that the binding of hard segments and the flexibility of soft segments had subtle effects on the gas permeability. The effects of hard segment content and the amount of cobalt ion on the gas permeability and morphological properties were investigated. Fourier transform infrared (FTIR) spectroscopy was utilized to identify the segregation between hard and soft segments and structure change, which affect the transport properties. The hydrogen bonding index (HBI), frequency difference, and shift as a measure of the phase segregation and the average strength of the interpolymer hydrogen bonds were utilized tostudy the intermolecular interaction and transport property of the prepared PUs. The results of differential scanning calorimetry, thermogravimetric analysis (TGA), and FTIR measurements explain the complexation and, hence, the gas permeability. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:865–873, 1998