Polyurethane gels (PUGs) were synthesized from poly (oxypropylene) glycol (PPG) (M̄n=2000, 4000 and 8000) and lysine triisocyanate (LTI). To control the number of dangling chains in the PUGs, with the ratio of K= [NCO]/[OH] was varied. The glass transition temperature of PPG in the PUGs (Tg,PUG) was observed at around -60°C by differential scanning calorimetry (DSC). The difference temperature of the glass transition temperature of PPG (Tg,PPG) and Tg,PUG (ΔT g) was decreased with an increase in molecular weight for PPG and a decrease in K. In the tan δ curve, different relaxation that can be attributed to the motion of the dangling chain was observed in the higher temperature side of α-relaxation. These all results are related to the formation of incomplete network structure due to the decrease in K, which can act as a dangling chains.
|Number of pages||1|
|Publication status||Published - Oct 18 2006|
|Event||55th SPSJ Annual Meeting - Nagoya, Japan|
Duration: May 24 2006 → May 26 2006
|Other||55th SPSJ Annual Meeting|
|Period||5/24/06 → 5/26/06|
All Science Journal Classification (ASJC) codes