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Reinforcement of shape-memory poly(ethylene-co-vinyl acetate) by carbon fibre to access robust recovery capability under resistant Condition`  
Reinforcement of shape-memory poly(ethylene-co-vinyl acetate) by carbon fibre to access robust recovery capability under resistant Condition`
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关键词: Smart  materials  Carbon  fibresPolymer-matrix  composites  Shape  memory  
polymer  
资料大?。?/td> 1443k
所属学科: 功能高分子
来源: 来源网络
简介:
Poly (ethylene-co-vinyl acetate) (EVA), as one of commercial polymers, has been used early to fabricateshape-memory polymers (SMPs). However, its low recovery stress restricts the potential applications insome tough conditions due to its high ?exible feature. Herein, we developed a series of EVA-basedcomposites (cEVA/CF) with remarkably enhanced recovery stress both in free-state and resistant con-dition by incorporating different amounts of a stiff ?ller carbon ?bre (CF) into the commercial EVAmatrix. The observation of morphology showed that CF was well dispersed in EVA matrix, and thethermal properties of cEVA/CF composites were just slightly affected as demonstrated by the DSCanalysis. More importantly, the modulus of composites was signi?cantly improved, especially above themelting temperature (Tm). This feature is valuable to improve the recovery stress of cEVA/CF compositesas both the shape deformation and recovery occur at T > Tm. To investigate the recovery behaviors of thecEVA/CF composites in free-state or with varying external loads, the strategy that combing appropriateclamp operation and well-designed procedures under two DMA modes (DMA Controlled Force and DMAIso-Strain) was put forward. Compared with pristine cEVA, cEVA/CF comp osites with 5e30 wt% CFpossessed 100e650% increase of recovery stress. Consequently, cEVA/CF composites exhibited a robustshape recovery performance under resistant condition, while the recovery capability of pristine cEVAwas totally depressed. Aiming at practical applications, a model of deployable device made of cEVA/CF30was well-established
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