| 引用本文: | 陈惟惟,钱善华,周帅帅,李辉,申玉军.丙烯酰胺浓度对聚二甲基硅氧烷表面涂层性能的影响[J].中国表面工程,2023,36(2):180~188 |
| CHEN Weiwei,QIAN Shanhua,ZHOU Shuaishuai,LI Hui,SHEN Yujun.Effect of Acrylamide Concentration on Coating Properties on Polydimethylsiloxane Surfaces[J].China Surface Engineering,2023,36(2):180~188 |
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| 摘要: |
| 硅橡胶的疏水特性致使其在体内的减阻性能较差，亟须开展其表面亲水性能和润滑性能均良好的工艺研究。以聚二甲基硅氧烷(PDMS)为基材，以丙烯酰胺(AAm)为反应单体，通过紫外光固化工艺在 PDMS 表面制备 5 种不同浓度的聚丙烯酰胺(PAAm)涂层，对涂层的表面成分、表面粗糙度、厚度、亲水性能及润滑性能进行表征，讨论 AAm 浓度对涂层性能的影响。结果表明：AAm 浓度对涂层厚度和粗糙度有显著影响，即随着 AAm 浓度的提升，涂层厚度和粗糙度均呈上升趋势； AAm 浓度也改善涂层的亲水性能和润滑性能，即与基材 PDMS(110°)相比，含 20 wt.% AAm 的涂层接触角低至 18.24°，降低到基材的 16.6%；含 8 wt.% AAm 的涂层摩擦因数低至 0.039，与基材 PDMS 相比降低 98.2%。提出一种硅橡胶表面构建牢固涂层的简单且高效的方法，可为软材料表面改性提供较好的借鉴。 |
| 关键词: 亲水表面 丙烯酰胺 涂层厚度 紫外光固化 摩擦因数 |
| DOI：10.11933/j.issn.1007?9289.20220504001 |
| 分类号:TH117 |
| 基金项目:国家烟草专卖局创新平台科研活动稳定支持专项(202022AWCX13)和国家自然科学基金(51775244)资助项目 |
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| Effect of Acrylamide Concentration on Coating Properties on Polydimethylsiloxane Surfaces |
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CHEN Weiwei1,2, QIAN Shanhua1,2, ZHOU Shuaishuai2, LI Hui3, SHEN Yujun3
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1.College of Mechanical Engineering, Jiangnan University, Wuxi 214122 , China;2.Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi 214122 , China;3.Zhengzhou Tobacco Research Institute, China National Tobacco Corporation, Zhengzhou 450001 , China
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| Abstract: |
| Silicone rubber is a hydrophobic polymer material that is non-toxic, odorless, and nonirritating to human tissues; hence, it is less likely to be rejected by the body. It is widely used in medical catheters owing to its good physiological inertia and biocompatibility. However, the hydrophobic characteristics of silicone rubber make its drag-reduction properties much poorer in vivo, resulting in a relatively low compatibility with human tissues. To improve the surface properties of silicone rubber in a water environment, new methods are need to improve the hydrophilic and lubricating properties of its surface. Existing strategies to obtain this type of surface, such as plasma treatment, chemical grafting, and hydrogel coating, have certain disadvantages. For instance, the effects of the plasma treatment method are unstable and hydrophobic recovery can occur. Hydrophilic surface modification by grafting is a complicated process, and the grafted polymer is easily damaged when subjected to wear, shear, or other mechanical loads. Although hydrogel coatings have the advantages of low friction, high wettability, and wear resistance, there are still disadvantages such as uncontrollable coating thickness and high surface roughness. Therefore, in this study, polydimethylsiloxane (PDMS) and acrylamide (AAm) were selected as the substrate and reaction monomer, respectively. Five types of polyacrylamide (PAAm) coatings with different concentrations were prepared on the PDMS surface using the UV curing process. The firm coating was prepared using a simple three-step method: pretreatment, curing, and cleaning. The surface composition and surface roughness of the coating were characterized by Fourier-transform infrared spectroscopy and white light interferometry, respectively. The coating thickness was measured using the step method. The coating thickness was measured using the step method. An adhesion test was conducted according to the grid method of the test standard ISO2409-2007 to characterize the bonding strength between the coating and substrate. The friction properties of the as-prepared coatings were characterized using a wear tester under the condition of water lubrication. The lubricating performance of the coating and the effects of the AAm concentration on the coating properties were also analyzed. The results showed that the AAm concentration had a significant effect on the thickness and roughness of the coating. As the AAm concentration increased, the corresponding thickness and roughness of the coatings increased. According to the Wenzel equation, the increased surface roughness of the hydrophilic material would also decrease the contact angle. Compared with the PDMS substrate (110°), the contact angle of the coating with 20 wt. % AAm reached as low as 18.24°, which decreased to 16.6% of the PDMS substrate. The hydrophilicity of the PDMS substrate surface significantly improved after the PAAm coating was prepared. In addition, the PAAm coating had a high bonding strength with the PDMS substrate and did not easily peel off. The AAm concentration also improved the lubricating properties of the coating. As the PAAm concentration increased, the friction factor of the coating first decreased and then slowly increased. The friction factor of the coating with 8 wt. % AAm reached as low as 0.039, which is 98.2% lower than that of the PDMS substrate. The proposed method to develop a strong coating on the silicone rubber surface is simple and efficient. It yields a coating with good hydrophilic and lubricating properties, thus providing better insights into the surface modification of similar soft materials. |
| Key words: hydrophilic surface acrylamide coating thickness UV curing friction factor |
