Preparation And Properties Of Star-Shaped Uv-Curable Polyester Methacrylate Resins With Low Viscosity Derived From Renewable Resources
PROGRESS IN ORGANIC COATINGS(2021)
摘要
To meet the growing needs of environmental protection and green sustainable development, we have synthesized a series of low viscosity and colorless transparent UV-curable polyester methacrylate resins derived from renewable biologically fermented lactic acid (LA). The structure and properties of these polyester methacrylates were characterized by H-1-NMR, FTIR, and viscometer. The results show that the viscosity of polyester methacrylates can be dramatically reduced from 34,620 mPa.s of PLA-DA to 160-756 mPa s of 4sPCLA-TA by random copolymerization of LA and epsilon-caprolactone (CL) and further introducing star-shaped structure into the oligomer chain. UV-curing kinetic studies demonstrated that lowering resin viscosity positively affects the polymerization of double-bonds. The changing gel contents agree with these observations. The polyester-based methacrylic resins were used to prepare UV-cured coatings, and the performance of the coatings was tested systematically. The 4sPCLA-TA resin with 756 mPa.s viscosity can still exhibit a high tensile strength of 59.2 MPa, bending strength of 92.3 MPa, and bending modulus 2.96 GPa, the glass transition temperature of 154.8 degrees C. UV-cured coating of the 4sPCLA-TA has a high pencil hardness of 4H and Shore D hardness of 77.6, adhesion of 2 grade, and 3 mm flexibility. Overall, renewable polyester-based methacrylic resins developed in this work are excellent candidates for preparing environmentally friendly UV coatings.
更多查看译文
关键词
UV-curable, Low viscosity, Renewable, Polyester methacrylate, Coating properties
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要