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4810076 
Journal Article 
Waterborne polyurethanes and their properties 
Kim, BK; Lee, JC 
1996 
Yes 
Journal of Polymer Science. Part A, Polymer Chemistry
ISSN: 0887-624X
EISSN: 1099-0518 
34 
6 
1095-1104 
WOS:A1996UC63000023 
Anionomer-type waterborne polyurethanes (PUs) were obtained from poly(beta-methyl-delta-valerolactone) glycol (PMVL) and isophorone diisocyanate, following a prepolymer mixing process. The soft-hard segment phase separation in response to the variations of composition and structure of PU has been studied from the dynamic mechanical measurements of the emulsion cast films. The structural variation included ionic and hard segment content, molecular weight of NCO-terminated prepolymer, and type and length of the soft segment. It was found that phase separation is more sensitive to the soft segment length, rather than the soft segment content. With only phase separation, the rubbery modulus was significant even with lower hard segment content. Phase separation was much more pronounced with PU from poly(tetramethylene adipate) glycol, rather than from PMVL and poly(caprolactone) (C) 1996 John Wiley & Sons, Inc. 
waterborne polyurethanes; ionomers; PCL; PTAd; PMVL