热压印聚丙烯疏水膜的制备及表征

Preparation and Characterization of Hot Embossed Polypropylene Hydrophobic Membrane

以聚丙烯(polypropylene, PP)为原料,不锈钢分子筛网为模板,通过热压印技术制备了PP疏水膜,重点考察了热压印工艺对疏水膜结构及性能的影响.利用扫描电子显微镜(SEM)分析膜表面形态结构的构筑及演变,以接触角测量仪测试膜的疏水性能,通过模拟材料的日常磨损分析PP疏水膜的机械稳定性能,由不同液滴在膜表面的滚动行为考察了膜的黏附性能.结果表明:PP疏水膜表面具有完善的微米级棱状突起结构,赋予膜良好的疏水性能;综合考虑热压印温度和压力的影响,通过单因素实验确立最佳成型工艺为140℃、10 000 N,PP疏水膜的表面静态水接触角为140.31°,滚动角为7°,具有良好的疏水性能和机械稳定性能.

Polypropylene(PP) hydrophobic membrane was prepared by hot embossing technique, using PP as raw material and stainless steel molecular sieve as template. The influence of hot embossing process on the structure and properties of hydrophobic membrane was investigated. The construction and evolution of the surface morphology were analyzed by scanning electron microscopy(SEM), the hydrophobic properties of the membrane were measured with a contact angle meter, the mechanical stability was analyzed by simulating the daily wear of the material, and the adhesion properties were investigated by the rolling behavior of different droplets on the membrane surface. The results show that the perfect micron-scale prismatic protrusion structure on the surface of the PP hydrophobic membrane promises the membrane excellent hydrophobicity. Considering the influence of hot embossing temperature and pressure, the optimal molding process parameters are established at 140 ℃ and 10 000 N by single factor experiment. The surface static water contact angle of the PP hydrophobic membrane is 140.31° and the rolling angle is 7°, the PP hydrophobic membrane shows excellent hydrophobic performance and mechanical stability.