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Synthesis and Characterization of Shape‐Memory Polyurethane–Polybenzoxazine Compounds
Author(s) -
Erden Numan,
Jana Sadhan C.
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201200315
Subject(s) - prepolymer , curing (chemistry) , monomer , isocyanate , polyurethane , polymer chemistry , materials science , polymerization , thermoplastic , shape memory alloy , polymer , composite material
The study investigates the scope for significant enhancements in shape‐memory properties in blends of thermoplastic polyurethanes (PUs) and polybenzoxazine (PB). PB was expected to serve as a second fixed phase in addition to hard segment of PU. The shape‐memory compounds were prepared in three steps. First, benzoxazine monomer was dissolved in urethane prepolymer synthesized from 4,4′‐methylenebis (phenyl isocyanate) (MDI) and poly (tetramethylene) glycol (PTMG). Second, the prepolymer was chain extended with 1,4‐butanediol (BD) without curing of benzoxazine. Third, the benzoxazine was polymerized into PB by thermal curing at 180 °C for 3 h. A compound with 17 wt% PB exhibited a recovery stress (RS) of 13 MPa and strain recovery (SR) of 93% compared with RS of 6.8 MPa and SR of 72% for PU.