原位一步法制备温敏改性纳米二氧化硅

Preparation of thermosensitive silica by in situ one-pot method

摘要:

采用原位一步法合成了温敏改性聚 N-异丙基丙烯酰胺(PNIPAAm)/SiO2纳米复合物. 通过接触角对温敏改性的纳米SiO2进行了条件优化：反应温度73℃，反应时间6 h,单体用量与KH-570摩尔比为1:1，引发剂用量为单体用量与KH-570总质量的2.5%。通过TEM、FT-IR、XPS等手段对温敏性纳米SiO2的组成和结构进行了表征。同时，这一有机-无机纳米复合物仍然保持PNIPAAm 的温度响应性, 最低临界溶解温度(LCST)与纯PNIPAAm相似。

Abstract:

A novel thermo-sensitive poly (N-isopropylacrylamide) (PNIPAAm)/ silica nano-composite has been prepared via in situ one-pot method . Effects of factors, such as reaction temperature, reaction time, monomer dosage and initiator dosage on the influence of contact angles were investigated. The optimum surface modification conditions were determined as: reaction temperature was 73℃, reaction time was 6 h, monomers and KH-570 molar ratios is 1, The amount of initiator monomer is 2.5 (wt%)of the total mass amount of monomer and KH-570. The samples were characterized by fourier transform infrared transmission emission microscope (TEM) and dynamic light scatter (DLS). Moreover, the thermo-sensitive property of PNIPAAm was retained in the nano-composite, which had a lower critical solution temperature similar to that of pure PNIPAAm.