Premium
Dynamic mechanical properties of polyurethane–urea microcapsules on coated paper
Author(s) -
Ichikawa Kimio
Publication year - 1994
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.1994.070540914
Subject(s) - polyurethane , glass transition , materials science , urea , core (optical fiber) , dynamic mechanical analysis , composite material , polymer chemistry , polymerization , substrate (aquarium) , chemistry , polymer , organic chemistry , oceanography , geology
Polyurethane–urea microcapsules were prepared by an interfacial polymerization method. Dynamic mechanical measurements were carried out on the polyurethane–urea microcapsules coated on a paper substrate. The glass transition temperatures (T g ) of capsule wall were observed in the temperature scan data. T g as the temperatures of tan δ peaks were decreased with increasing amounts of core materials. The apparent activation energies of the glass transition were estimated at about 100 kcal/mol. Master curves were obtained by shifting the tan δ spectra along the frequency axis, and the glass transition regions were unaffected by core materials studied. The shift factors were found to depend on the core/wall ratio and discussed in terms of a morphological change of microcapsules. © 1994 John Wiley & Sons, Inc.