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利用多巴胺可在固体材料表面自聚合的特性,在聚丙烯(PP)薄膜表面制备有一定厚度的聚多巴胺层.通过接触角测量仪(CA)和扫描电子显微镜(SEM)对修饰膜的表面进行相应的表征.考察了溶液的pH值、多巴胺的浓度和反应时间等制备条件对修饰膜亲水性的影响;对修饰膜的耐久性能进行了一定的探索;并用万能力学试验机测试聚多巴胺层与PP膜间的剥离强度.研究结果表明,多巴胺可在PP膜表面发生自聚,对表面进行修饰;在溶液pH值为8.5,多巴胺浓度为2.0 g/L,反应时间24 h的实验条件下,对PP膜的亲水性能改善效果最佳,接触角从未经修饰时的105°下降至63°左右;耐久性能测试结果表明,该方法制备的修饰层在60℃的水溶液中或在pH值介于1.0和10.0范围的溶液浸泡后,仍可保持原有修饰表面的亲水特性;T型剥离结果表明聚多巴胺层与PP膜间的剥离强度为(25.3±3.0)N/m.
Polydopamine layers with a certain thickness were prepared on the surface of polypropylene (PP) films by the self-polymerization of dopamine on the surface of the solid materials.The surface of the films was modified by contact angle measurement (CA) and scanning electron microscopy (SEM) The effects of preparation conditions such as solution pH value, dopamine concentration and reaction time on the hydrophilicity of the modified films were investigated, and the durability of the modified films was explored. The properties of the polydopamine layer And PP membrane.The results show that dopamine can self-polymerization on the surface of PP membrane, and modify the surface. Under the experimental conditions of pH 8.5, dopamine concentration 2.0 g / L, reaction time 24 h , The best hydrophilicity of PP membrane was improved. The contact angle decreased from 105 ° unmodified to about 63 °. The results of durability test showed that the modified layer prepared in this method was stable in 60 ℃ aqueous solution or at pH The hydrophilic properties of the original modified surface were retained even after immersion in the range of 1.0 and 10.0. The T-peel results showed that the peel strength between the polydopamine layer and the PP film was (25.3 ± 3.0) N / m.