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PCL–PEG–PCL triblock ester–ether copolydiol‐based waterborne polyurethane. II. Effect of NCO/OH mole ratio and DMPA content on the physical properties
Author(s) -
Yen Mengshung,
Kuo Shuchin
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(19980214)67:7<1301::aid-app21>3.0.co;2-2
Subject(s) - polycaprolactone , polyurethane , peg ratio , polymer chemistry , materials science , molar , ionomer , chemical engineering , nuclear chemistry , chemistry , composite material , polymer , copolymer , dentistry , medicine , finance , engineering , economics
This article was focused on the effects of the NCO/OH molar ratio and 2,2‐bis(hydroxyl methyl) propionic acid (DMPA) content during prepolymerization on the physical properties of synthesized waterborne polyurethane (WBPU) by using the polycaprolactone–poly(ethyl glycol)–polycaprolactone triblock copolydiol (PCL–PEG–PCL) as the soft segment. The results showed that the particle size of the WBPUs' dispersion decreased with a decreasing NCO/OH molar ratio or increasing DMPA content. Regarding thermal and mechanical properties, the WBPUs had a higher T g 's and lower T m 's and a higher breaking stress and a lower breaking strain of film with the NCO/OH molar ratio or DMPA content increase. The increasing NCO/OH molar ratio was advantageous to the water vapor permeability (WVP)‐breaking stress balance, but the effect of the DMPA content on the WVP was not significant. The WBPU with PCL–PEG–PCL as the soft segment had a smaller particle size in dispersion and a better WVP‐breaking stress balance than those of WBPU with the blending PCL and PEG as the soft segment. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1301–1311, 1998