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The plasticizing effect on the thermal transitions of the toluenediisocyanate‐based polyurethanes monitored by thermally stimulated current technique
Author(s) -
Hsu JungMu,
Yang DerLern,
Huang Steve K.
Publication year - 2000
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(20000502)76:5<743::aid-app17>3.0.co;2-j
Subject(s) - materials science , elastomer , polyurethane , differential scanning calorimetry , polycaprolactone , plasticizer , amorphous solid , composite material , polymer , chemical engineering , chemistry , organic chemistry , physics , engineering , thermodynamics
A liquefied curative in methylene‐bis‐orthochloroaniline/dioctyl or di‐2‐ethylhexyl phthalate (MOCA/DOP) was used as the substitute curative for the hot‐melt MOCA curative in a two‐component preparative system for the toluene diisocyanate (TDI)‐based polyurethane elastomers. The polyurethane elastomer specimens based on this liquefied curative were prepared with three different soft segments with the addition of various plasticizers. The DOP‐added specimens were evaluated by the depolarization technique in the thermally stimulated current/relaxation mapping analysis (TSC/RMA). The results were also compared with differential scanning calorimeter and dynamic mechanical analyzer on the observation on the changes in thermal transitions. Results indicated that at a low DOP content of less than 26 wt %, little disruption on the urethanic matrix was found in the TDI‐polycaprolactone (PCL)/MOCA‐DOP system. However, at a high DOP content of 47 wt %, a disruption in TDI‐poly(tetramethylene) oxide (PTMO) amorphous phase by DOP was observed. The optimum weight ratio of MOCA/DOP was found to be 1 : 2 and this liquefied solution was stable at the ambient temperature, and can be applicable for use as a curative for the preparation of the TDI‐based polyurethane elastomers at ambient temperature. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 743–761, 2000