当前位置: X-MOL 学术J. Intell. Mater. Syst. Struct. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
How graphene oxide affects shape memory properties and strength of poly(l-lactide-co-ε-caprolactone)
Journal of Intelligent Material Systems and Structures ( IF 2.4 ) Pub Date : 2020-07-25 , DOI: 10.1177/1045389x20942581
Xue-Jiao Zhang 1 , Qing-Sheng Yang 1 , Jin-Song Leng 1, 2
Affiliation  

Poly( l -lactide-co-ε-caprolactone) is an environment-friendly shape memory polymer. Molecular dynamics method was used to study the shape memory effect and mechanical properties of graphene oxide–reinforced poly( l -lactide-co-ε-caprolactone) to understand the microscopic mechanism. Two models containing dispersed graphene oxide were constructed. It is shown that the addition of graphene oxide causes the glass transition temperature of material to rise because of limitation on polymer activity. The uniaxial tensile properties of the composites were studied. The results exhibited that strength of composites depend on the interface state of the polymer and graphene oxide. The strength of the composite with covalent bond is much higher than that of another without the covalent bond between graphene oxide and poly( l -lactide-co-ε-caprolactone) generated. Stress softening effect was observed in the cross-linked composite in the glass state. Their uniaxial tension thermodynamic cycles were carried out to consider the shape memory effect of the composites. It is shown that graphene oxide–reinforced composites with different interactions exhibit fair shape memory effect in the direction of paralleling graphene oxide surface. In terms of the direction perpendicular to graphene oxide sheet, the fixed ratios of the composites decrease slightly about 1.64%–3.63%, and the recovery ratios of the composites with the covalent bond are higher than others about 3.22%–12.93%.

中文翻译:

氧化石墨烯如何影响聚(l-丙交酯-共-ε-己内酯)的形状记忆特性和强度

聚(l-丙交酯-共-ε-己内酯)是一种环保形状记忆聚合物。分子动力学方法用于研究氧化石墨烯增强的聚(l-丙交酯-共-ε-己内酯)的形状记忆效应和机械性能,以了解微观机制。构建了两个包含分散氧化石墨烯的模型。结果表明,由于聚合物活性的限制,氧化石墨烯的加入导致材料的玻璃化转变温度升高。研究了复合材料的单轴拉伸性能。结果表明,复合材料的强度取决于聚合物和氧化石墨烯的界面态。具有共价键的复合材料的强度远高于另一种没有生成氧化石墨烯和聚(l-丙交酯-共-ε-己内酯)共价键的复合材料。在玻璃态的交联复合材料中观察到应力软化效应。进行单轴拉伸热力学循环以考虑复合材料的形状记忆效应。结果表明,具有不同相互作用的氧化石墨烯增强复合材料在平行氧化石墨烯表面的方向上表现出良好的形状记忆效应。在垂直于氧化石墨烯片的方向上,复合材料的固定比例略有下降,约为1.64%~3.63%,具有共价键的复合材料的回收率高于其他材料,约为3.22%~12.93%。在玻璃态的交联复合材料中观察到应力软化效应。进行单轴拉伸热力学循环以考虑复合材料的形状记忆效应。结果表明,具有不同相互作用的氧化石墨烯增强复合材料在平行氧化石墨烯表面的方向上表现出良好的形状记忆效应。在垂直于氧化石墨烯片的方向上,复合材料的固定比例略有下降,约为1.64%~3.63%,具有共价键的复合材料的回收率高于其他材料,约为3.22%~12.93%。在玻璃态的交联复合材料中观察到应力软化效应。进行单轴拉伸热力学循环以考虑复合材料的形状记忆效应。结果表明,具有不同相互作用的氧化石墨烯增强复合材料在平行氧化石墨烯表面的方向上表现出良好的形状记忆效应。在垂直于氧化石墨烯片的方向上,复合材料的固定比例略有下降,约为1.64%~3.63%,具有共价键的复合材料的回收率高于其他材料,约为3.22%~12.93%。结果表明,具有不同相互作用的氧化石墨烯增强复合材料在平行氧化石墨烯表面的方向上表现出良好的形状记忆效应。在垂直于氧化石墨烯片的方向上,复合材料的固定比例略有下降,约为1.64%~3.63%,具有共价键的复合材料的回收率高于其他材料,约为3.22%~12.93%。结果表明,具有不同相互作用的氧化石墨烯增强复合材料在平行氧化石墨烯表面的方向上表现出良好的形状记忆效应。在垂直于氧化石墨烯片的方向上,复合材料的固定比例略有下降,约为1.64%~3.63%,具有共价键的复合材料的回收率高于其他材料,约为3.22%~12.93%。
更新日期:2020-07-25
down
wechat
bug