摘要
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.
Based on the strong adhesive behavior of polydopamine on solid surface,PP film were modified via dispersing in a dopamine solution at room temperature. The properties of modified films were mainly characterized by contact angle measurements （CA） and scanning electron microscopy （SEM）. The peeling strength was measured using a T-peel test performed on an electronic universal testing machine. The results of CA showed that the hydrophilic properties of the film could be controlled by adjusting pH value, dopamine concentration and reaction time. The effects of polydopamine on film surface morphologies were investigated by SEM. The contact angle reduced from 105° to about 63° under the reaction conditions of pH 8.5, the concentration at 2.0 g/L for 24 h,which meant the hydrophilicity of PP films was significantly improved by the attachment of polydopamine. The durability of the modified layer was also investigated. The results indicate that the modified surface could retain its hydrophilic properties after immersing in water at 60 ℃ for 4g h or in a solutions of pH values between 1.0 and 10.0. There was no polydopamine dreg evidently split away from the PP film after durability test. Moreover, the peeling strength between polydopamine and PP film was about （25.3 ±3.0） N/m.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2013年第10期1319-1324,共6页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号21274007)
北京市自然科学基金
北京市教育委员会科技计划重点项目(项目号KZ201110011014)
北京市教委科技创新平台项目(项目号PXM2012-014213-000025)资助
关键词
聚多巴胺
聚丙烯
表面修饰
Polydopamine, Polypropylene, Surface modification
