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Recent progress in shape memory polymer: New behavior,enabling materials,and mechanistic understanding

Affiliation:	1. Singapore Centre for 3D Printing, School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;2. Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, 637662, Singapore

Abstract:	Shape memory polymers (SMPs), as a class of programmable stimuli-responsive shape changing polymers, are attracting increasing attention from the standpoint of both fundamental research and technological innovations. Following a brief introduction of the conventional shape memory effect (SME), progress in new shape memory enabling mechanisms and triggering methods, variations of in shape memory forms (shape memory surfaces, hydrogels, and microparticles), new shape memory behavior (multi-SME and two-way-SME), and novel fabrication methods are reviewed. Progress in thermomechanical modeling of SMPs is also presented.

Keywords:	Shape memory polymer Smart materials Stimuli-responsive polymer Polymer modeling SCPs"} {"#name":"keyword" "$":{"id":"kw0030"} "$$":[{"#name":"text" "_":"shape changing polymers LCEs"} {"#name":"keyword" "$":{"id":"kw0040"} "$$":[{"#name":"text" "_":"liquid crystalline elastomers SMP"} {"#name":"keyword" "$":{"id":"kw0050"} "$$":[{"#name":"text" "_":"shape memory polymer SME"} {"#name":"keyword" "$":{"id":"kw0060"} "$$":[{"#name":"text" "_":"shape memory effect 2W"} {"#name":"keyword" "$":{"id":"kw0070"} "$$":[{"#name":"text" "_":"two-way 1W"} {"#name":"keyword" "$":{"id":"kw0080"} "$$":[{"#name":"text" "_":"one-way transition temperature glass transition temperature melting temperature liquid crystal cleaning temperature deformation temperature shape fixing temperature crystallization temperature shape stability ratio shape recovery ratio switching temperature maximum recoverable strain maximum recovery stress SMC"} {"#name":"keyword" "$":{"id":"kw0210"} "$$":[{"#name":"text" "_":"shape memory cycle strain under load fixed strain recovery temperature recovered strain strain recovery rate apparent switching temperature PCL"} {"#name":"keyword" "$":{"id":"kw0295"} "$$":[{"#name":"text" "_":"poly(?-caprolactone) SMPU"} {"#name":"keyword" "$":{"id":"kw0305"} "$$":[{"#name":"text" "_":"shape memory polyurethane EMU"} {"#name":"keyword" "$":{"id":"kw0315"} "$$":[{"#name":"text" "_":"elemental memory unit TME"} {"#name":"keyword" "$":{"id":"kw0325"} "$$":[{"#name":"text" "_":"temperature memory effect PU"} {"#name":"keyword" "$":{"id":"kw0335"} "$$":[{"#name":"text" "_":"polyurethane liquid-crystal isotropic transition temperature vitrification temperature CIE"} {"#name":"keyword" "$":{"id":"kw0365"} "$$":[{"#name":"text" "_":"crystallization induced elongation MIC"} {"#name":"keyword" "$":{"id":"kw0375"} "$$":[{"#name":"text" "_":"melting induced contraction
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