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4D Printable Shape Memory Polyamide Elastomer by Reactive Extrusion
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DOI：10.1021/acsapm.5c01008.png)
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Abstract
En 中文
Thermoplastic polyamide elastomer (TPAE) is usually synthesized by polycondensation of polyamide and polyether or polyester through esterification/amidation in a stainless steel reactor, which requires harsh reaction conditions and a long reaction time. Unfortunately, this synthetic method cannot produce a high-viscosity sample or a micro-cross-linked sample. In the present work, a kind of TPAE named poly(urethane-urea-amide) (PUUA) was prepared by amino-terminated long carbon chain polyamide 1212 (PA1212) and diisocyanate-terminated polytetramethylene ether glycol (PTMG) through reactive extrusion, which simplified the reaction conditions and shortened the reaction time. Through combining different PA1212 hard segments and PTMG soft segments, PUUAs showed excellent and adjustable mechanical and thermal properties. And the tensile strength and elongation at break could vary in the range of 6–38 MPa and 180–490%, respectively. With the aid of melting/crystallization temperature or glass transition temperature, PUUA exhibited an outstanding one-way shape memory effect (1W-SME) with a shape fixation ratio (Rf) of ∼97.5% and two-way shape memory effect (2W-SME) with a response strain (εres) of 3.8–14.3% for quasi 2W-SME and ∼2.9% for reversible 2W-SME. Furthermore, PUUA was processed into the wire for fused deposition modeling (FDM), followed by optimization of printing parameters, and then printed into a “swan” possessing a 2W-SME achieving 4D printing. The reactive extrusion production technology not only offers a simple way for synthesizing TPAE industrially but also broadens the application range of TPAE.
Keywords:
thermoplastic polyamide elastomer
reactive extrusion
shape memory effect
4D printing
poly(urethane-urea-amide)
Journal
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IF:
3.5
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Citations:
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