文献类型：期刊文献

英文题名：Diphenolic Acid-Derived Hyperbranched Epoxy Thermosets with High Mechanical Strength and Toughness

作者：Xiao, Laihui[1] Li, Wenbin[1] Li, Shuai[1] Chen, Jie[1] Wang, Yigang[1] Huang, Jinrui[1] Nie, Xiaoan[1]

第一作者：Xiao, Laihui

通信作者：Chen, J[1]|[a000589b5308f5ef7bcf9]陈洁;

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod,Key Lab Biomass Energy, Natl Engn Lab Biomass Chem Utilizat,Coinnovat Ctr, Natl Forestry & Grassland Adm,Key Lab Chem Engn F, Nanjing 210042, Jiangsu, Peoples R China

年份：2021

卷号：6

期号：49

起止页码：34142-34149

外文期刊名：ACS OMEGA

收录：;Scopus(收录号：2-s2.0-85120912817);WOS:【SCI-EXPANDED(收录号:WOS:000757388000086)】；

基金：This work was financially supported by the Jiangsu Key Laboratory of Biomass Energy and Material (JSBEM-S202002), the Innovation and Promotion Project for Forestry Science and Technology of Jiangsu Province (LYKJ[2019]45), National Natural Science Foundation of China for Youth Science Funds (51803234), the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (CAFYBB2020QB006), and Fundamental Research Funds of Research Institute of Forest New Technology, CAF (CAFYBB2019SY028).

语种：英文

摘要：Diglycidyl ether of bisphenol A (DGEBA) is a kind of widely used epoxy resin, but its thermosets normally show high brittleness and poor impact resistance due to the intrinsic rigid aromatic rings, which limit its application greatly. To avoid this drawback, we proposed a method to prepare a series of hyperbranched epoxies (HBEPs) with different molecular weights. After HBEPs were cured with methyl tetrahydrophthalic anhydride (MTHPA), characterizations were carried out to evaluate the properties of the cured HBEP samples. Testing results indicate that the hyperbranched thermosets can achieve excellent mechanical strength and toughness (tensile strength: 89.2 MPa, bending strength: 129.6 MPa, elongation at break: 6.1%, toughness: 4.5 MJ m(-3), and impact strength: 6.7 kJ m(-2)), which are superior to those of the thermosets of commercial DGEBA (tensile strength: 81.2 MPa, bending strength: 108.2 MPa, elongation at break: 3.0%, toughness: 1.5 MJ m(-3), and impact strength: 4.2 kJ m(-2)). In addition, HBEP with the highest molecular weight and degree of branching shows the best comprehensive mechanical properties. All hyperbranched thermosets exhibit high glass-transition temperatures (T-g) and thermostability, which further illustrates the potential application value of HBEPs.