A comparative study of grafting steps on the preparation and properties of modified nanosilica for UV-curable coatings

作者：Wu, Jianbing; Ling, Lixia; Ma, Guozhang; Wang, Baojun^*

来源：JCT Research, 2014, 11(5): 717-725.

DOI：10.1007/s11998-014-9593-8

• Surface modification
• Nanosilica
• Grafting to
• UV-curable coatings
• Acrylsilane

Nanosilica was modified and functionalized with acrylsilane by the "grafting to" method via different grafting steps, i.e., prepared-grafting step and step-wise propagation. The prepared-grafting step was achieved by grafting the nanosilica surface with the prepared acrylsilane, which was obtained by thiol-ene click reaction between 3-mercaptopropyl trimethoxysilane (MPTMS) and trimethylolpropane triacrylate (TMPTA). The step-wise propagation was achieved by first grafting MPTMS onto the nanosilica surface and then using the mercapto groups as initiators to react with TMPTA. The acrylsilane was characterized by FTIR. The modified nanosilica was characterized by FTIR, TGA, and contact angle analysis. It was demonstrated that the thiol-ene click reaction can easily occur between MPTMS and TMPTA. The grafting ratio of modified nanosilica via prepared-grafting step was higher than that of step-wise propagation. The SEM images of fractured films containing modified nanosilica also indicated that the former is more effective than the latter in reducing the self-aggregation of nanosilica. The effects of modified nanosilica on the viscosity and hardness of UV-curable coatings were also investigated.

• 出版日期2014-9
• 单位太原理工大学; 中国科学院长春应用化学研究所