Oligo-fluoropolymer Modified Cycloaliphatic Epoxy Resins with Excellent Compatibility, Waterproof and Mechanical Properties for LED Encapsulation  

作　　者：SUN Yang LIU Weiqu WANG Zhengfang TAN Jianquan 

机构地区：[1]Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, P. R. China [2]Key Laboratory of Cellulose and Lignocellulosics Chemistry of Chinese Aeademy of Sciences, Guangzhou 510650, P. R. China [3]University of ChineseAcademy of Sciences, Beijing 100049, P. R. China

出　　处：《Chemical Research in Chinese Universities》2018年第2期326-332,共7页高等学校化学研究（英文版）

摘　　要：An oligo-fluoropolymer（PFM） with functional cycloaliphatic epoxy and fluorinated groups was obtained via free radical polymerization and applied to the modification of cycloaliphatic epoxy resins（CE）. The chemical structure of PFM was characterized by Fourier transform infrared（FT1R） spectroscopy, gel permeation chromatogra- phy（GPC） and nuclear magnetic resonance（NMR） spectroscopy, and the effects of different PFM concentra- tions（0.5%-6%, mass fraction） on the thermal resistance, mechanical properties, surface dewettability, light trans- mission, refractive index and various cured polymer properties were studied ha detail. The DSC and TGA results demonstrate that the modified epoxy resins possess a higher thermal resistance than the neat epoxy resin. The im- provements in the surface dewettability and water resistance are caused by the high crosslinking density and the enrichment of the oligo-fluorinated random copolymers dispersed in the matrix. The fracture surface morphologies of the thermosets were investigated by scanning electron microscopy（SEM） and transmission electron microsco- py（TEM）. It was observed that the optical transmittance of the composites was maintained even though microphase separation occurred during the curing process. With respect to the corresponding properties of the neat epoxy resins, the 2 phr（parts per hundreds of resin） PFM thermoset exhibited relatively better comprehensive properties, making the cured material a good candidate for light-emitting diode（LED） encapsulation.An oligo-fluoropolymer（PFM） with functional cycloaliphatic epoxy and fluorinated groups was obtained via free radical polymerization and applied to the modification of cycloaliphatic epoxy resins（CE）. The chemical structure of PFM was characterized by Fourier transform infrared（FT1R） spectroscopy, gel permeation chromatogra- phy（GPC） and nuclear magnetic resonance（NMR） spectroscopy, and the effects of different PFM concentra- tions（0.5%-6%, mass fraction） on the thermal resistance, mechanical properties, surface dewettability, light trans- mission, refractive index and various cured polymer properties were studied ha detail. The DSC and TGA results demonstrate that the modified epoxy resins possess a higher thermal resistance than the neat epoxy resin. The im- provements in the surface dewettability and water resistance are caused by the high crosslinking density and the enrichment of the oligo-fluorinated random copolymers dispersed in the matrix. The fracture surface morphologies of the thermosets were investigated by scanning electron microscopy（SEM） and transmission electron microsco- py（TEM）. It was observed that the optical transmittance of the composites was maintained even though microphase separation occurred during the curing process. With respect to the corresponding properties of the neat epoxy resins, the 2 phr（parts per hundreds of resin） PFM thermoset exhibited relatively better comprehensive properties, making the cured material a good candidate for light-emitting diode（LED） encapsulation.

关 键 词：Oligo-fluoropolymer Epoxy resin Light-emitting diode ENCAPSULATE 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业] TG146.21[一般工业技术—材料科学与工程]