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首先对形状记忆功能高分子的特性进行了分析,提出了形状记忆性能的评价指标,即形状回复率、形状固定率、形状回复速度等.并进一步探讨了乙烯醋酸乙烯基共聚物(EVA) 的形状记忆功能特性,研究发现,用过氧化二异丙苯(DCP) 可对EVA 进行适度交联,控制二者组分结构,从而控制EVA 的交联程度,可使EVA 具有优异的记忆功能特性,如形状回复率和形状固定率均可达95 % 以上;进一步分析了EVA 的化学结构,讨论了分子结构与形状记忆性能的影响,并结合DMTA等热分析技术,对交联EVA 的交联密度进行计算,结果表明EVA 的交联点间分子量随DCP 用量增加而下降,并且其交联程度与EVA 的记忆特性存在着某种内在的必然联系,进一步研究分析发现其形状固定性与室温和橡胶态模量的比值呈线性关系,初步揭示了形状记忆机理
Firstly, the properties of shape memory polymer were analyzed, and the evaluation indexes of shape memory performance were put forward, that is shape recovery rate, shape fixation rate, shape recovery rate, etc. Further, the effects of ethylene-vinyl acetate copolymer (EVA) The shape memory function of the study found that the use of dicumyl peroxide (DCP) EVA can be properly cross-linked to control the composition of the two components in order to control the degree of cross-linking EVA can make EVA has excellent memory function Such as the shape recovery rate and the shape fixation rate can reach more than 95%. The chemical structure of EVA is further analyzed, and the influence of molecular structure and shape memory property is discussed. Combined with DMTA and other thermal analysis techniques, The results show that the molecular weight of cross-linked EVA decreases with the increase of the amount of DCP, and there is a certain inherent relationship between the degree of cross-linking and the memory properties of EVA. Further study shows that the shape stability of the cross- And rubber ratio of a linear relationship between the modulus, initially revealed the shape memory mechanism