单宁酸改性制备光敏碳纳米管及UV光固化AESO复合膜的制备

本文以单宁酸(TA)和甲基丙烯酸缩水甘油酯(GMA)为原料,通过开环反应制备出含有双键的光敏单宁酸(pTA),并通过π-π非共价键作用使其吸附到碳纳米管上,得到pTA修饰后的具有良好分散性的光敏碳纳米管(pTA/MWCNTs)。再将该pTA/MWCNTs作为填料添加到环氧大豆油丙烯酸酯(AESO)中,通过UV光固化得到AESO-pTA/MWCNTs复合膜。利用pTA对MWCNTs进行改性,提高了MWCNTs的分散性,同时引入双键,使得pTA/MWCNTs能够参与到光固化过程中,提高了碳纳米管与AESO基质间的界面粘结力,对AESO起到了比较好的增强作用。本文还研究了pTA/MWCNTs的加入对AESO复合涂料光固化动力学及涂膜性能的影响,结果表明该pTA/MWCNTs的掺入提高了光固化AESO复合膜的力学性能,当掺入量为0.8%时,对膜的增强效果最好,与纯AESO比较,其拉伸模量提高了390%,拉伸强度提高了110%。

Preparation of Photosensitive Carbon Nanotubes by Tannic Acid Modification and Preparation of UV-curable AESO Composite Films

Tannic acid (TA) and glycidyl methacrylate (GMA) were used to prepare a photosensitive tannic acid (pTA) containing double bonds through ring-opening reaction. The pTA modified photosensitive carbon nanotubes (pTA/MWCNTs) with good dispersibility were adsorbed onto carbon nanotubes through π-π noncovalent interaction. The as-prepared pTA/MWCNTs was subsequently incorporated into acrylated epoxidized soybean oil (AESO) covalently via UV curing technology. Modification of MWCNTs by pTA not only improves the dispersibility of MWCNTs, but also introduces double bonds, which enables pTA/MWCNTs to participate in the photocuring process, improves the interfacial adhesion between carbon nanotubes and AESO matrix and plays a better role in enhancing AESO. The effect of pTA/MWCNTs addition on photocuring kinetics and film properties of AESO composite was also studied. The results showed that the addition of pTA/MWCNTs improved the mechanical properties of photocuring epoxy resin. When the amount of pTA/MWCNTs was 0.8%(mass fraction), the enhancement effect on the film was the best. Compared with pure AESO, the tensile modulus of the film increased 390% and the tensile strength increased 110%.