摘要
纳米SiO_(2)颗粒粒径小、比表面积大,广泛用做填料、涂料、催化剂等。由于纳米SiO_(2)颗粒表面能高、亲水性强、易团聚、在聚合物基体中的分散性差,需要对其表面修饰改性。多巴胺(DA)分子具有类似贻贝分泌的黏附蛋白的结构单元儿茶酚和活性基团氨基,在碱性条件下,通过氧化自聚可在多种材料表面沉积,形成富含活性基团的聚多巴胺(PDA)包覆层,可进行二次修饰,是近期发展的一种新型表面修饰方法。本文针对纳米SiO_(2)颗粒表面的PDA功能化修饰,分析了该修饰方法的工艺特点及优势,阐述了SiO_(2)@PDA纳米颗粒及SiO_(2)/PDA共聚复合颗粒的制备路线及应用,总结了SiO_(2)@PDA颗粒表面二次功能化修饰的研究进展。分析表明,SiO_(2)@PDA表面易于接枝功能化聚合物分子,并可负载功能纳米颗粒,有利于拓展SiO_(2)纳米颗粒的多功能应用。关于多巴胺与SiO_(2)纳米颗粒的表面反应机制、沉积动力学、聚合机理等仍需进一步研究。
Silica(SiO_(2))nanoparticles with small particle size and large specific surface area are widely used as fillers,paints,catalyst etc.However,due to the high surface energy and poor interface compatibility with polymer matrix,modification for the SiO_(2) nanoparticles is necessary to solve the problems of the pool dispersion and easy agglomeration in application.Dopamine(DA)molecules possess the similar structure unit and strong adhesion as those of adhesive proteins secreted by mussels,and it can form polydopamine(PDA)coated layer on the surface of SiO_(2) substrate in alkaline solution expeditiously,which results in the improvement of the chemical versatility and strong adhesion performance to substrate.PDA modification is a new modification method developed recently for particle surface.This paper reviewed the preparation and application of SiO_(2)@PDA nanoparticles and nanocomposite,as well as the secondary modification of SiO_(2)@PDA and the application.The characteristics and advantages of the PDA modification were summarized.The analysis indicated that SiO_(2)@PDA particle surface can easily graft functional polymer molecules and load metal nanoparticles,which expanded the multifunctional application of SiO_(2) nanoparticles.However,the surface reaction mechanism,deposition kinetics and polymerization mechanism of SiO_(2)@PDA nanoparticles still needed to be further studied.
作者
马冠香
杨令
王亭杰
MA Guanxiang;YANG Ling;WANG Ting-jie(Department of Chemical Engineering,Tsinghua University,Beijing 100084,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2021年第12期6729-6737,共9页
Chemical Industry and Engineering Progress
