中文摘要：

为了准确获得硅橡胶材料的静态接触角,研究了不同水珠体积和憎水性下接触角算法的选择问题。考虑到水珠表面服从Young-Laplace方程,仿真分析了硅橡胶处于憎水性状态（静态接触角〉90°）且水珠体积〈100μL时接触角和水珠体积对椭圆拟合算法准确性的影响。结果表明：接触角不变且接触角≥105°时,随着水珠体积的增加椭圆拟合算法误差增大,水珠体积〈100μL且接触角为（90°,105°）时可选用椭圆拟合算法;水珠体积不变,随着接触角的增加椭圆拟合算法误差有增大的趋势;在大接触角或大体积时ASDA-P算法具有更高的准确性。洁净硅橡胶接触角时计算可选用椭圆拟合算法,染污后憎水性迁移或超疏水硅橡胶的接触角时计算应选用ASDA-P算法。文中给出了不同水珠体积和接触角下的算法选择策略。最后用不同憎水性和水珠体积下硅橡胶的静态接触角测量实验验证了分析结论。

英文摘要：

For improving accuracy of silicone rubber static contact angle measurement,we focused on the selection of contact angle algorithm of different globule volume and hydrophobicity.Supposing that the globule surface obeys the Young-Laplace equation,we analyzed the contact angle of globule images of silicone rubber when the static contact angle is larger than 90° and volume less than 100 μL.The results indicate that,if the contact angle keeps constant,and the contact angle is not less than 105°,ellipse fitting algorithm error will increase with the globule volume,if the contact angle of silicone rubber is less than 105° and larger than 90°,in the meantime,the globule volume is less than 100 μL,the ellipse fitting algorithm should be selected.If the globule volume keeps constant,the error of the ellipse fitting algorithm will increase with the increase of the contact angle.If the contact angle or volume is large,axisymmetric drop shape analysis-profile（ASDA-P） algorithm has higher accuracy.If the contact angle of the clean silicone rubber sample is calculated,the ellipse fitting algorithm should be selected.If the contact angle is contaminated and hydrophobicity is completely migrated silicone rubber samples or super-hydrophobicity samples are calculated,the ASDA-P algorithm should be selected.The contact angle algorithm selection strategy of different globule volumes and contact angles is given.Finally,the contact angle of silicone rubber samples with different contact angles and globules volume was calculated by the ellipse fitting algorithm and the ASDA-P algorithm,and the result verified the above analysis.