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多巴胺@纳米金刚石作为新型增强纳米填料用于聚酰亚胺，具有增强的热、机械和耐磨性能。

Dopamine@Nanodiamond as novel reinforcing nanofillers for polyimide with enhanced thermal, mechanical and wear resistance performance.

作者信息

Qin Songlv, Cui Mingjun, Qiu Shihui, Zhao Haichao, Wang Liping, Zhang Afang

机构信息

College of Materials Science and Engineering, Shanghai University Nanchen Road 333 Shanghai 200444 China

Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Ningbo China 315201.

出版信息

RSC Adv. 2018 Jan 18;8(7):3694-3704. doi: 10.1039/c7ra10688b. eCollection 2018 Jan 16.

DOI:10.1039/c7ra10688b
PMID:35542956
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9077701/
Abstract

In this study, to achieve a homogeneous dispersion of nanodiamond (ND) in a polyimide (PI) matrix and a strong interfacial adhesion between ND and the PI matrix, a biomimetic nondestructive dopamine chemistry was employed for surface modification of ND. FTIR and Raman spectroscopy studies revealed that self-polymerization of dopamine could produce thinner polydopamine (PDA) layers on the ND surface spontaneous oxidation and the intermolecular cross-linking reaction of PDA molecules. The structure and morphology of PDA-ND were studied by FTIR, SEM, and Raman spectroscopy, which verified the π-π interactions between PDA and ND. The facile dispersion of PDA-ND in a polyamic acid prepolymer made it possible to obtain PI/ND composites with no obvious ND aggregation. The effect of PDA-ND nanoparticles on the thermal, mechanical and tribological properties of the resulting PI/PDA-ND composites were evaluated, and the results showed that the incorporation of PDA-ND could increase the hardness, tensile strength, storage modulus, as well as the wear resistance properties. PI/PDA-ND composites prepared in this study showed that PDA-ND is a promising nanoreinforcing filler for PI composites.

摘要

在本研究中，为了实现纳米金刚石（ND）在聚酰亚胺（PI）基体中的均匀分散以及ND与PI基体之间的强界面粘附力，采用了仿生无损多巴胺化学方法对ND进行表面改性。傅里叶变换红外光谱（FTIR）和拉曼光谱研究表明，多巴胺的自聚合能够在ND表面产生更薄的聚多巴胺（PDA）层，这是PDA分子的自发氧化和分子间交联反应所致。通过FTIR、扫描电子显微镜（SEM）和拉曼光谱对PDA-ND的结构和形态进行了研究，证实了PDA与ND之间的π-π相互作用。PDA-ND在聚酰胺酸预聚物中的易分散性使得获得无明显ND团聚的PI/ND复合材料成为可能。评估了PDA-ND纳米颗粒对所得PI/PDA-ND复合材料的热性能、力学性能和摩擦学性能的影响，结果表明，加入PDA-ND可以提高硬度、拉伸强度、储能模量以及耐磨性能。本研究制备的PI/PDA-ND复合材料表明，PDA-ND是一种有前途的用于PI复合材料的纳米增强填料。

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