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Abstract：
In this study, a 3D-printed photocurable resin was developed by incorporating graphene nanoplatelets functionalised with melamine to investigate the thermal, mechanical, fracture and shape memory behaviours. The objective of this work was to produce a printed functionally graded nanocomposite material that has a smart temperature-responsive structure; presents good thermal stability, strength and fracture toughness; and can demonstrate shape-changing motions, such as sequential transformations, over time. The functionalised graphene nanoplatelets were examined via thermogravimetric analysis, Fourier transform infrared spectroscopy, Raman spectroscopy and ultraviolet-visible spectroscopy. Thermogravimetric analysis showed that the degradation temperature of the nanocomposite containing 0.1 wt% of functionalised graphene nanoplatelets at the weight loss of 5% was 304 °C, greater than that of the neat one by 29%. Dynamic mechanical analysis results showed property enhancements of the storage modulus and glass transition temperature. Fracture toughness, tensile strength and impact resistance were improved by 18%, 35% and 78%, respectively. The shape memory tests were performed to obtain the temperature-time recovery behaviour of the 3D-printed structures. The addition of functionalised graphene nanoplatelets demonstrated an enhancement in the shape recovery ratios. Generally, the five subsequent cycles were notably stable with a high recovery ratio of 97-100% for the flat shape and circular shape of the M-GNP specimens. On the other hand, these values were between 91% and 94% for the corresponding neat specimens.
摘要：
在这项研究中,一种3D打印的光固化树脂是通过掺入用三聚氰胺功能化的石墨烯纳米片来研究热，机械,骨折和形状记忆行为。这项工作的目的是生产一种具有智能温度响应结构的印刷功能梯度纳米复合材料;具有良好的热稳定性，强度和断裂韧性；并且可以表现出形状变化的运动，例如顺序转换，随着时间的推移。通过热重分析检查功能化的石墨烯纳米片，傅里叶变换红外光谱,拉曼光谱和紫外-可见光谱。热重分析表明，在失重5％时，含有0.1wt％的功能化石墨烯纳米片的纳米复合材料的降解温度为304°C，比整洁的高出29%。动态力学分析结果显示储能模量和玻璃化转变温度的性能增强。断裂韧性,拉伸强度和抗冲击性提高了18%，35%和78%，分别。进行形状记忆测试以获得3D打印结构的温度-时间恢复行为。官能化石墨烯纳米片的添加证明了形状恢复率的提高。一般来说,对于M-GNP样品的扁平形状和圆形形状，随后的五个循环特别稳定，回收率高，为97-100％。另一方面,对于相应的纯样本，这些值在91％至94％之间。
