Relationship of Structure and Damping Property in Poly(Ether-Ester) Polyurethane Elastomer
Poly(ether-ester) polyurethane (PU) elastomer were prepared with 2,4-tolulene diisocyanate (TDI-100),3,3′-dichloro-4,4'-diaminodiphenyl methane (MOCA) and poly(neopentyl glycol propoxylated succinic acid) (PNPS) or poly(neopentyl glycol propoxylated adipic acid) (PNPA),which were synthesized from neopentyl glycol propoxylated (PONPG) and succinic acid (SA) or adipic acid (AA) through condensation polymerization.The structures and molecular weights of poly(ether-ester) glycols were characterized by FT-IR,GPC and 1H-NMR.The macrostructure of PU elastomer were characterized by AFM.The effects of type and molecular weight of poly(etherester) glycols on damping property of PU elastomer were investigated.The results indicate that the maximum loss factor (tanδmax) of PU is improved gradually and the glass transition temperature moves to lower region significantly with increase of poly(ether-ester) glycols molecular weight:Simultaneously,AFM phase domains of PU increase and three-dimensional figures show a rugged jungle-like morphology.Furthermore,with the same molecular weight,PU prepared from PNPA has the smaller tanδmax and the lower damping region.The damping property of PU elastomer agrees well with the phase separation structures.
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