高密度聚乙烯基水凝胶复合涂层制备及其摩擦学性能  

Preparation and tribological properties of high density polyethylene based hydrogel composite coating

作　　者：刘春荣 刘思思[1] 邓宇星 王思贤 段尚豪 贾海涛 LIU Chunrong;LIU Sisi;DENG Yuxing;WANG Sixian;DUAN Shanghao;JIA Haitao(School of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China;Taizhou Med Medical Technology Co.,Ltd.,Taizhou 225300,China)

机构地区：[1]湘潭大学机械工程与力学学院,湘潭411105 [2]泰州麦迪医疗科技有限公司,泰州225300

出　　处：《复合材料学报》2025年第1期349-361,共13页Acta Materiae Compositae Sinica

基　　金：湖南省青年科技人才项目(2022RC1133);湖南省制造业关键产品“揭榜挂帅”项目(2023GXGG001,2023GXGG018)。

摘　　要：受天然关节结构启发,在高密度聚乙烯(HDPE)表面构建水凝胶涂层,从而提升材料润湿性能及承载性能。然而水凝胶与HDPE基体结合性能差易脱落,因此采用紫外诱导多巴胺(DA)聚合形成聚多巴胺(PDA)接枝在HDPE上,得到HDPE-PDA样品,随后在HDPE-PDA表面构建纳米羟基磷灰石-聚乙烯醇(HAPVA)水凝胶涂层,得到HDPE-PDA-HA-PVA水凝胶复合涂层样品。研究了样品的润湿性能、生物相容性、界面结合性能及摩擦学特性等。将HDPE-PDA-HA-PVA分别置于加了Na^(+)、Ca^(2+)、Al^(3+)的小牛血清(BSA)稀释润滑溶液中,探究了金属离子对摩擦副的影响规律。综上发现:HDPE-PDA的静态水接触角由未接枝前的94.57°降低至26.87°,抗菌性能提升98%,与水凝胶的结合力提升了84%。在摩擦学性能研究中发现,HDPEPDA-HA-PVA在2 N载荷水润滑条件下的摩擦系数低至0.016,仅存在微量磨损。当载荷增大至5 N时,与HDPE相比平均摩擦系数和磨损量分别降低了73%和46%。在探究含金属离子的润滑溶液对摩擦学性能的影响中发现,在3 N载荷下,含Ca^(2+)的润滑溶液表现出较好的润滑性能,这是由于Ca^(2+)能增强材料对润滑蛋白的吸附,易形成润滑层,表现出比其他含金属离子的润滑溶液更好的润滑特性。Inspired by the natural joint structure,a hydrogel coating is constructed on the surface of high density polyethylene(HDPE)to improve the wettability and bearing capacity of materials.However,the adhesion between hydrogel and HDPE matrix is poor and easy to fall off,so UV induced dopamine(DA)polymerization is used to form polydopamine(PDA)grafted onto HDPE to obtain HDPE-PDA sample,and then nano hydroxyapatite polyvinyl alcohol(HA-PVA)hydrogel coating is constructed on the surface of HDPE-PDA to obtain HDPE-PDA-HA-PVA sample.Studied the wetting performance,biocompatibility,interface bonding performance and tribological characteristics of the sample.The effect of metal ions on friction pairs was investigated by placing HDPE-PDA-HA-PVA in a diluted lubrication(BSA)solution of calf serum containing Na^(+),Ca^(2+)and Al^(3+),respectively.To sum up:It is found that the static water contact angle of HDPE-PDA is reduced from 94.57°before grafting to 26.87°,the antibacterial performance is increased by 98%,and the adhesion with hydrogel is increased by 84%.In the study of tribological properties,it was found that the friction coefficient of HDPE PDA-HA-PVA under 2 N load water lubrication conditions was as low as 0.016,with only slight wear.When the load increased to 5 N,the average friction coefficient and wear amount decreased by 73%and 46%respectively compared to HDPE.In exploring the effect of lubrication solutions containing metal ions on tribological properties,it was found that under a 3 N load,lubrication solutions containing Ca^(2+)exhibited better lubrication performance.This is because Ca^(2+)can enhance the material's adsorption of lubricating proteins,easily forming a lubrication layer,and exhibiting better lubrication characteristics than other lubrication solutions containing metal ions.

关 键 词：高密度聚乙烯 聚多巴胺 水凝胶 润滑剂 摩擦学性能 

分 类 号：TH145.4[一般工业技术—材料科学与工程] TB332[机械工程—机械制造及自动化]