Relationship between dangling chains in polyurethanes and their properties

Eiichi Imoto; Suguru Motokucho; Ken Kojio; Mutsuhisa Furukawa

Relationship between dangling chains in polyurethanes and their properties

Eiichi Imoto, Suguru Motokucho, Ken Kojio, Mutsuhisa Furukawa

Research output: Contribution to conference › Paper › peer-review

Abstract

Polyurethane gels (PUGs) were synthesized from poly (oxypropylene) glycol (PPG) (M̄_n=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 (T_g,PUG) was observed at around -60°C by differential scanning calorimetry (DSC). The difference temperature of the glass transition temperature of PPG (T_g,PPG) and T_g,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.

Original language	English
Number of pages	1
Publication status	Published - Oct 18 2006
Externally published	Yes
Event	55th SPSJ Annual Meeting - Nagoya, Japan Duration: May 24 2006 → May 26 2006

Other

Other	55th SPSJ Annual Meeting
Country/Territory	Japan
City	Nagoya
Period	5/24/06 → 5/26/06

All Science Journal Classification (ASJC) codes

Engineering(all)

Cite this

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title = "Relationship between dangling chains in polyurethanes and their properties",

abstract = "Polyurethane gels (PUGs) were synthesized from poly (oxypropylene) glycol (PPG) ({\=M}n=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.",

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T1 - Relationship between dangling chains in polyurethanes and their properties

AU - Imoto, Eiichi

AU - Motokucho, Suguru

AU - Kojio, Ken

AU - Furukawa, Mutsuhisa

PY - 2006/10/18

Y1 - 2006/10/18

N2 - 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.

AB - 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.

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T2 - 55th SPSJ Annual Meeting

Y2 - 24 May 2006 through 26 May 2006

ER -

Relationship between dangling chains in polyurethanes and their properties

Abstract

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