Thermo‐mechanical properties of rosin‐modified o‐cresol novolac epoxy thermosets comprising rosin‐based imidoamine curing agents

编号 020027004

推送时间 20201221

研究领域 林产化工 

年份 2020 

类型 期刊 

语种 英语

标题 Thermo‐mechanical properties of rosin‐modified o‐cresol novolac epoxy thermosets comprising rosin‐based imidoamine curing agents

来源期刊 Polymer engineering and science

期 第270期

发表时间 20201023

关键词 crosslinking;  renewable resources;  resins;  structure-property relationship;  imidoamine; 

摘要 Rosin‐modified o‐cresol novolac epoxy resin (AEOCN) was synthesized by condensation of rosin acid with o‐cresol formaldehyde novolac resin (AOCN). The AEOCN resin was further epoxidized using epichlorohydrin and sodium hydroxide. Rosin‐based imidoamine curing agents (IAMDK, IASDK, and IAEDK) were also prepared by reacting dimaleopimaryl ketone (DMPK), a dimerized rosin product with aromatic diamines. The chemical structures of all synthesized products were confirmed by FTIR, 1H‐NMR, 13C‐NMR, and DEPT‐135° spectroscopic techniques. The curing process of rosin‐modified epoxy cured with imidoamine crosslinkers was studied using differential scanning calorimetry (DSC) and the results were compared to o‐cresol novolac epoxy resin (EOCN) and some previously reported commercial‐based systems. The thermal and mechanical properties of the cured epoxy thermosets were determined using a thermogravimetric analyzer (TGA) and a universal testing machine (UTM), respectively. The chemical resistance analysis was carried out by immersing cured epoxy coated panels in 1M NaOH, 1MHCl, and 1M NaCl solutions. The results were evaluated in terms of % weight loss method and the morphological changes that appeared due to chemical exposure were also investigated via scanning electron microscopy (SEM). This study presents the economical synthetic approach towards high‐performance bio‐based epoxy coating materials impending to replace some of the petrochemical compounds in coating industries.

服务人员 尚玮姣

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