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In situ infrared spectroscopy and moving-window two-dimensional (MW2D) correlation spectroscopy were employed to study the multiple endotherms observed in differential scanning calorimetry (DSC) curves for linear thermoplastic polyurethanes (TPUs). A 4,4′- diphenylmethane diisocyanate (MDI)/1,4-butanediol (BDO) polyester based TPU with a hard segment content of 45 wt % was used in this study. Temperature-dependent...
Most shape memory polymers are rigid and exhibit only one way (irreversible) shape memory effect. This work explored the two-way (reversible) shape memory effect for semi-crystalline elastomeric networks. These semi-crystalline networks with various gel fractions and crosslinking densities were synthesized via radical initiated crosslinking of poly(ethylene-co-vinyl acetate). The thermal, mechanical,...
A series of rod-coil-rod triblock copolymers containing polycaprolactam (PA6) as the coil block and poly (p-benzamide) (PBA) as the rod block were synthesized by a two-step polycondensation reaction. Proton nuclear magnetic resonance ( 1 H NMR), UV–vis spectrophotometry (UVS) and differential scanning calorimetry (DSC) were performed to determine the fundamental molecular structure and thermal...
Deformation-induced phase transition behavior of polyamide 12 (PA12) in its segmented copolymers with polytetrahydrofuran (PTHF) was studied with in-situ wide angle X-ray scattering (WAXS) at different temperatures. In these segmented copolymers, which contain a high content of PTHF, a transformation from the stable γ phase to a metastable α″ phase is observed during tensile deformation at room temperature,...
A series of rod–coil–rod triblock copolymers were synthesized by two-step polycondensation with polycaprolactam (PA6) as the flexible block and poly(p-benzamide) (PBA) as the rod. Proton nuclear magnetic resonance ( 1 H NMR), UV–vis spectrophotometry and differential scanning calorimetric (DSC) were first performed to determine the fundamental molecular structure and thermal property of each...
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