中文摘要：

为了更加准确地获得硅橡胶材料的静态接触角,有必要研究接触角测量时各种因素对测量结果的影响。基于接触角测量仪和数码相机及动静态接触角自动计算软件DSCA（dynamic static contact angle）,研究了座滴法测量硅橡胶静态接触角时水珠体积、拍照延迟时间、温度、水电导率和样本纵向倾斜程度对测量所得接触角的影响。结果表明：水珠体积对静态接触角测量没有明显影响,但不同体积水珠的最佳接触角算法不同;随拍照延迟时间增加,接触角有下降趋势,洁净样本、电晕样本、染污完全迁移样本下降速度较慢,浸泡和染污未完全迁移样本下降速度较快;温度对测量所得接触角有影响,低温下静态接触角偏小;水电导率对测量得到的接触角未见明显影响;反向倾斜可能会导致大误差,正向倾斜时,无论是大接触角图像还是小接触角图像,倾斜程度对测得的接触角影响不大,但倾斜的水珠图像会给自动计算带来难度。因此,低温中取出的试样要恢复到室温后测量,而高温试样则关系不大;水珠体积选择2～4μL;拍照可选择滴水后5s左右进行;水应选择去离子水,如无也可用自来水或具有一定电导率的盐水替换;尽量选择镜头平面垂直于硅橡胶平面时进行拍摄。

英文摘要：

To improve accuracy of static contact angle measurement of silicone rubber material,the influence of various factors on accuracy of silicone rubber static contact angle measurement should be studied.Basing on a contact angle meter,digital camera and dynamic and static contact angle calculation software DSCA（dynamic static contact angle）,we studied the influences of globule volume,delay time,temperature,water conductivity and sample longitudinal inclination on the static contact angle measurement according to sessile drop method.Results indicate that globule volume has little influence on the static contact angle measurement result,while different volume＇s globule images need different algorithms to calculate the contact angle.Static contact angle decreases with increase in delay time,however,clean,corona,and completely migration-contaminated samples have slow decrease speed,meanwhile,immersed,incompletely migration-contaminated samples have fast decrease speed.Temperature has some influences on the static contact angle measurement,static contact angle becomes small at low temperature.Water conductivity has no obvious effect on the measured static contact angle.If inclination direction is negative,the inclination may cause large error.If inclination direction is positive,in despite of large static contact angle or small static contact angle,the inclination has little influence on the measurement result of static contact angle,however,the inclined globule image will cause difficulty in automatic calculation of static contact angle.So,if a sample is taken out from low temperature condition,it must be placed to room temperature,if the sample is taken out from high temperature condition,it can be measured directly.The globule volume should be selected as 2~4 μL.The globule image should be pictured in 5 s after dripping.Deionized water should be selected,and running water or saline water with certain conductivity can be substituted.Photos should be taken when silicone rubber plane is perpendicular to camera lens