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Synthesis, characterization, and permeation properties of polyether‐based polyurethanes
Author(s) -
Chen C. T.,
Eaton R. F.,
Chang Y. J.,
Tobolsky A. V.
Publication year - 1972
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.1972.070160821
Subject(s) - peg ratio , materials science , absorption of water , polyurethane , polymer , polymer chemistry , permeation , swelling , chemical engineering , modulus , polyethylene glycol , composite material , membrane , chemistry , biochemistry , finance , engineering , economics
A system of synthesis of polyether‐based urethanes was developed which had sufficient flexibility in composition so that transport properties could be optimized. Mixtures of poly(oxyethylene) glycol (PEG) and poly(oxypropylene) glycol (PPG) of a variety of molecular weights were tied together by varying amounts of kinds of “hard segments.” Thus, the water swell, the mechanical properties, and the size of the soft blocks and hard blocks could be varied. With a fixed content of hard segments, the water absorption decreased with decrease in the PEG/PPG ratio, demonstrating the feasibility of producing controlled changes in hydrophilicity of the polymer without significant change in the mechanical strength. Some polyurethanes based on PEG 600 and PPG 425 had a very good high value of P w / P s but a somewhat low value of P w . The polyurethanes prepared by using phenylenediamines as chain extenders had markedly enhanced modulus and an extended rubbery plateau region, as anticipated.