Synthesis,Characterization and Properties of a Series of Copoly(amide-imide-ether-urethane)s with a New Hard Segment Constituent: Study of the Effect of Hard Segment Content

Abstract

Two series of thermally modified thermoplastic polyurethane elastomers (TPU)s based on poly(oxytetramethylene glycol) (PTMG) (PT samples), and poly(oxyethylene glycol) (POE) (PO samples) were synthesized from 4,4'-methylene-bis-(4-phenylisocyanate) (MDI) and an aromatic diacid, bis(p-amido benzoic acid)-N-trimellitylimido- L-leucine (BPABTL) (1). The aromatic diacid contains a L-leucine group and a preformed imide ring. The novel diacid was reacted with excess MDI to give an isocyanate terminated oligomer that was subsequently reacted with a polyol to give the poly(amide-imide-ether-urethane)s (PAIEU)s. The properties of the resulting PAIEUs were compared with poly(ether urethane)s without incorporation of BPABTL. The PAIEUs had a constant soft segment (SS) length derived from the polyol (average M _n 1000) but a variable hard block length. Studies were conducted on the effect of hard segment (HS) molar ratio on dynamic mechanical thermal properties, thermal properties, phase separation, crystallinity and solvent resistance of these new PAIEUs.

Keywords

copoly(amide-imide-ether-urethane)s hard segment content isocyanate route L-leucine phase separation

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