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Chemistry and Industry of Forest Products ›› 2016, Vol. 36 ›› Issue (5): 61-67.doi: 10.3969/j.issn.0253-2417.2016.05.009

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Synthesis and Phase Separation Phenomena of Cardanol Diethers-Mannich Base Curing Agent

SONG Jian1, LI Mei1,2, LI Shou-hai1,2, HUANG Kun1, XIA Jian-ling1,2   

  1. 1. Institute of Chemical Industry of Forest Products, CAF;National Engineering Lab. for Biomass Chemical Utilization;Key and Open Lab. of Forest Chemical Engineering, SFA;Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China;
    2. Research Institute of Forestry New Technology, CAF, Beijing 100091, China
  • Received:2016-07-05 Online:2016-10-25 Published:2016-11-05

Abstract: The cardanol diethers (CDE) was obtained from Williamson etherification of cardanol(CD) and 1,3-dibromopropane. Then the cardanol diethers-Mannich baseas curing agent (MBCDE) for epoxy resins was prepared from the Mannich reaction of CDE, paraformadehyde and diethylenetriamine. The chemical structure was confirmed by FT-IR and 1H NMR. N-Aminoethylpiperazine (AEP) was chose as a control to investigate the toughening properties of MBCDE. Thermogravimetric analysis (TGA), scanning electronic microscopy (SEM) and mechanical properties of the cured epoxies were also conducted to investigate the properties of the bisphenol A epoxy resin (DGEBA) cured by two curing agents. The TGA results showed that the maximum decomposition temperature of MBCDE was 351.6℃ and the sample had good thermal stability. The impact strength of cured AEP/DGEBA was 3.641 J/m, while the cured 80% MBCDE sample had an impact strength of 5.155 J/m, which was improved by 41.6%. SEM results indicated that there was phase seperation in the cured materials contained MBCDE.

Key words: cardanol, phase separation, curing agent, epoxy resin, phenol-aldehyde amine, Mannich reaction

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