Kim Jongsoo, Chisholm Bret J, Bahr James
Center for Nanoscale Science and Engineering, NDSU, Fargo, North Dakota 58102, USA.
Biofouling. 2007;23(1-2):113-20. doi: 10.1080/08927010701189708.
Interactions between coating thickness, modulus and shear rate on pseudobarnacle adhesion to a platinum-cured silicone coating were studied using a statistical experimental design. A combined design method was used for two mixture components and two process variables. The two mixture components, vinyl end-terminated polydimethylsiloxanes (V21: MW=6 kg mole(-1) and V35: MW=4 9.5 kg mole(-1), Gelest Inc.) were mixed at five different levels to vary the modulus. The dry coating thickness was varied from 160 - 740 microm and shear tests were performed at four different shear rates (2, 7, 12, and 22 microm s(-1)). The results of the statistical analysis showed that the mixture components were significant factors on shear stress, showing an interaction with the process variable. For the soft silicone coating based on the high molecular weight polydimethylsiloxane (E=0.08 MPa), shear stress significantly increased as coating thickness decreased, while shear rate slightly impacted shear force especially at 160 microm coating thickness. As the modulus was increased (E=1.3 MPa), more force was required to detach the pseudobarnacle from the coatings, but thickness and rate dependence on shear stress became less important.
采用统计实验设计方法，研究了涂层厚度、模量和剪切速率对伪藤壶附着于铂固化硅酮涂层的相互作用。对于两种混合组分和两个工艺变量，采用了组合设计方法。将两种乙烯基封端的聚二甲基硅氧烷混合组分（V21：分子量 = 6 kg·mol⁻¹ 和 V35：分子量 = 49.5 kg·mol⁻¹，Gelest 公司）以五种不同比例混合，以改变模量。干涂层厚度在 160 - 740 微米之间变化，并在四种不同的剪切速率（2、7、12 和 22 微米·秒⁻¹）下进行剪切试验。统计分析结果表明，混合组分是剪切应力的显著影响因素，与工艺变量存在相互作用。对于基于高分子量聚二甲基硅氧烷（E = 0.08 MPa）的软质硅酮涂层，随着涂层厚度减小，剪切应力显著增加，而剪切速率对剪切力的影响较小，尤其是在涂层厚度为 160 微米时。随着模量增加（E = 1.3 MPa），将伪藤壶从涂层上分离所需的力更大，但厚度和速率对剪切应力的依赖性变得不那么重要。
