Research on Structure and UV Curing Behaviors of Novel Cardanol-Based Unsaturated Resins Using FTIR Spectrum Analysis Method
LI Shou-hai1，2, YANG Xue-juan1, LI Mei1, HUANG Kun1, 2, XIA Jian-ling1, 2*
1. Institute of Chemical Industry of Forestry Products, Chinese Academy of Forestry; Key Lab of Biomass Energy and Material, Jiangsu Province; National Engineering Lab for Biomass Chemical Utilization; Key Lab on Forest Chemical Engineering, State Forestry Administration, Nanjing 210042, China 2. Institute of Forest New Technology, Chinese Academy of Forestry, Beijing 100091, China
Abstract：Two dissimilar cardanol-based unsaturated resin monomers were prepared via simple ring-opening and etherification reaction by utilizing the reactivity between phenolic hydroxyl and epoxy group with the aid of cardanol as raw material. The transformations of different groups were characterized using Fourier transform infrared (FTIR) during the synthesis process, the resin monomers’ structure was further analyzed using the 1H-nuclear magnetic resonance (1H-NMR) and gel permeation chromatography (GPC), and the UV curing behaviors of resin monomers were studied by means of FTIR method. In addition, the thermal stability of UV cured resin monomers were also tested by thermogravimetric analysis(TGA). The molecular structure analysis demonstrated that these two target products were successfully synthesized. UV curing behaviors analysis showed that the prepared cardanol-based unsaturated resin monomers could reach ultimate curing level within 30 s. TGA results showed that the molecular structure and the content of double bond had critical influence on their thermal stability. The main initial thermal decomposition temperature of these two cured resin monomers was all above 350 ℃.
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