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Two‐Way Reversible Shape Memory Properties of Benzoyl Peroxide Crosslinked Poly(ethylene‐co‐vinyl acetate) under Different Stress Conditions
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-03-12 , DOI: 10.1002/mame.201900825 Jin Hui 1 , Hong Xia 2 , Yaqin Fu 3 , Yiping Qiu 4 , Qing‐Qing Ni 2, 5
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-03-12 , DOI: 10.1002/mame.201900825 Jin Hui 1 , Hong Xia 2 , Yaqin Fu 3 , Yiping Qiu 4 , Qing‐Qing Ni 2, 5
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Two‐way (reversible) chemically crosslinked semicrystalline shape memory polymers are synthesized using poly(ethylene‐co‐vinyl acetate) (PEVA) with benzoyl peroxide (BPO). The two‐way shape memory effect (2W‐SME) is achieved under both constant stress and stress‐free conditions. It is found that the stress‐free 2W‐SME can be achieved by the relationship between the initial prestretching strain (Rprestretch) and recovery strain (Rrec). Under the same prestretching stress, the stress‐free two‐way shape memory behavior can be controlled by variation of Rrec using a different setting temperature (Tset) in the recovery process. More importantly, the driving force and recovery force, as one of the key indicators for two‐way shape memory materials, are investigated, and they significantly change depending on the BPO content. The sample with high BPO content shows excellent high‐temperature creep resistant performance. A highly crosslinked structure can suppress viscous flow and provides sufficient force to allow the sample to recover its initial shape after crystal melting. Therefore, the PEVA/BPO samples are able to contract during heating. The presence of an oriented crystal structure with high applied stress that causes sample elongation during cooling is also investigated. These findings for PEVA/BPO two‐way shape memory polymers will contribute to their applications as soft actuators in various fields.
中文翻译：
在不同应力条件下过氧化苯甲酰交联的聚（乙烯-乙酸乙烯酯）的双向可逆形状记忆特性
双向（可逆）化学交联的半结晶形状记忆聚合物是使用聚（乙烯-共-乙酸乙烯酯）（PEVA）和过氧化苯甲酰（BPO）合成的。在恒定应力和无应力条件下均可实现双向形状记忆效应（2W-SME）。发现通过初始预拉伸应变（R prestretch）和恢复应变（R rec）之间的关系可以实现无应力的2W-SME 。在相同的预拉伸应力，无应力的双向形状记忆行为可以通过变化来控制ř REC使用不同的设置温度（Ť集）在恢复过程中。更重要的是，对作为双向形状记忆材料的关键指标之一的驱动力和恢复力进行了研究，它们随BPO含量的变化而显着变化。高BPO含量的样品具有出色的耐高温蠕变性能。高度交联的结构可以抑制粘性流动，并提供足够的力使样品在晶体融化后恢复其初始形状。因此，PEVA / BPO样品在加热过程中会收缩。还研究了具有高施加应力的定向晶体结构的存在，该结构会导致样品在冷却过程中伸长。PEVA / BPO双向形状记忆聚合物的这些发现将有助于它们在各种领域中作为软致动器的应用。
更新日期：2020-03-12
中文翻译：
在不同应力条件下过氧化苯甲酰交联的聚（乙烯-乙酸乙烯酯）的双向可逆形状记忆特性
双向（可逆）化学交联的半结晶形状记忆聚合物是使用聚（乙烯-共-乙酸乙烯酯）（PEVA）和过氧化苯甲酰（BPO）合成的。在恒定应力和无应力条件下均可实现双向形状记忆效应（2W-SME）。发现通过初始预拉伸应变（R prestretch）和恢复应变（R rec）之间的关系可以实现无应力的2W-SME 。在相同的预拉伸应力，无应力的双向形状记忆行为可以通过变化来控制ř REC使用不同的设置温度（Ť集）在恢复过程中。更重要的是，对作为双向形状记忆材料的关键指标之一的驱动力和恢复力进行了研究，它们随BPO含量的变化而显着变化。高BPO含量的样品具有出色的耐高温蠕变性能。高度交联的结构可以抑制粘性流动，并提供足够的力使样品在晶体融化后恢复其初始形状。因此，PEVA / BPO样品在加热过程中会收缩。还研究了具有高施加应力的定向晶体结构的存在，该结构会导致样品在冷却过程中伸长。PEVA / BPO双向形状记忆聚合物的这些发现将有助于它们在各种领域中作为软致动器的应用。
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