| 聚丙烯中空纤维膜疏水性能测试方法研究 |
| 作者：李晓明 吕经烈 |
| 单位： 国家海洋局天津海水淡化与综合利用研究所 |
| 关键词： 聚丙烯；中空纤维疏水膜；静态接触角；膜粗糙度 |
| DOI号： |
| 分类号： TQ317.3 |
| 出版年,卷(期):页码： 2014,34(2):56-59 |
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摘要： |
| 采用切线法测量聚丙烯中空纤维膜的静态接触角，考察了实验条件如平衡时间、滴液体积以及环境温湿度对膜接触角的影响，根据相对标准偏差确定了接触角测试条件。在此基础上，采用原子力显微镜进行膜表面形貌表征，测量并比较聚丙烯初生纤维和商品膜的接触角，分析了表面粗糙度对膜疏水性能的影响。结果表明，当液滴体积小于0.1ul，避免了液滴重力对接触角的影响，环境温湿度和平衡时间是影响测量结果的主要因素。规则的微孔结构使膜表面粗糙度增大，形成毛细效应，有效阻止了液滴铺展和滑移，膜疏水性能显著提高。当液滴体积为0.04ul，环境温度为20℃±2℃，湿度为25%±4%～65%±4%，液滴平衡时间为15秒，膜接触角为111.2°～107.8°，相对标准偏差小于5%。 |
| Static contact angle of polypropylene hollow fiber membrane had been measured by tangent fitting method. The effects such as droplet size, equilibrium time, environmental temperature and humidity on membrane contact angle were studied. According to relative standard deviation (RSD) of membrane contact angle, the optimal testing parameters were determined. Based on above results, atomic force microscopy was used to characterize membrane surface morphology. Through comparison the angle results of commercial membrane and as-spun fiber, the relevance between membrane roughness and membrane hydrophobic was analyzed as well. The results showed that in order to improve accuracy of testing method, the influence of droplet gravity was avoided when droplet size was less than 0.1 microliter. Droplet equilibrium time, environmental temperature and humidity were the main factors. Regular micro-porous structure increased membrane surface roughness and formed capillary effect, prevented the droplet spreading and sliding along the fiber axial effectively, so membrane hydrophobic performance was improved significantly. The optimal testing parameters are listed as followed: droplet volume is 0.04ul, the environment temperature is 20℃±2℃, humidity is from 25%RH±4%RH to 65%RH±4%RH, droplet equilibration time is within 15 seconds, RSD of membrane contact angle is less than 5%. |
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基金项目： |
| 国家海洋局业务化项目子任务(YWH-2012-05) |
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作者简介： |
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李晓明(1980-)，女，辽宁省朝阳市人，硕士研究生，工程师，主要从事膜制备、检测及应用研究. *联系人 |
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参考文献： |
| [1] WAN LingShu, MENG XiangLin, YANG YunFeng, et al. Thermo-responsive stick-slip behavior of advancing water contact angle on the surfaces of poly(N-isopropylacrylamide)-grafted polypropylene membranes[J]. Science China Chemistry, 2010, 53(1):183-189. [2] 吉海燕,陈刚,胡杰.微纳米结构对聚合物超疏水表面润湿性的影响[J].工程塑料用,2011,39(4):94-96. [3] 连峰,张会臣,邹赫麟,等.反应离子刻蚀和自组装分子膜构建硅基底疏水与超疏水表面[J].高等学校化学学报,2011,32(12):2833-2837. [4] Gil Hurwitz, Eric M.V. Hoek. Characterizing Membrane Surface Charge by Contact Angle Titration[Z]. American Geophysical Union Fall Meeting, Sanfrancisco, USA, 2006. [5] Gil Hurwitz, Gregory R. Guillen, Eric M.V. Hoek. Probing polyamide membrane surface charge, zeta potential, wettability, and hydrophilicity with contact angle measurements[J].Journal of Membrane Science, 2010,349(1-2):349-357. [6] 王新平,陈志方,沈之荃.高分子表面动态行为与接触角时间依赖性[J].中国科学B辑,2005,35(1):64-69. [7] 陈志,耿兴国.高性能微纳米结构不粘薄膜的研究[J].材料导报,2005,19(3):104-105. |
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