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|標題:||Comparison of the Properties of Epoxy Resin and Epoxidized Novolactype Phenol-formaldehyde Resins
|關鍵字:||Cryptomeria japonica;Epoxidized novolac resins;Epoxy resins;Liquefied wood;Phenolformaldehyde resins;柳杉;環氧化Novolac樹脂;環氧樹脂;液化木材;酚醛樹脂||Project:||林業研究季刊, Volume 37, Issue 1, Page(s) 55-63.||摘要:||
In this study, epoxy resin was prepared by reacting bisphenol A with epichlorohydrin. Epoxidized phenol-formaldehyde resins (E-PF and E-LWPF) were prepared by reacting novolac resins that prepared from fossil phenol and liquefied Cryptomeria japonica with epichlorohydrin. The epoxy equivalent, weight average molecular weight, gel behavior, and molecular structure of these three epoxy group containing resins were compared. In addition, triethylene tetramine (TETA) was used as a crosslinking hardener, and the physical, mechanical, and thermal properties of room temperature cured resins were investigated. The results showed that OH groups in novolac resin could be converted to epoxy groups by reacting with epichlorohydrin. E-PF had the number of epoxy group more than epoxy and E-LWPF. All of these epoxy group containing resins could cure under room temperature after TETA was added as a crosslinking hardener. The curing behavior of E-PF was similar to epoxy resin, but it was more moderate for E-LWPF. DSC analysis showed that E-PF underwent more crosslinking reaction than that of others during curing. Set epoxidized PF resins had higher weight retention after dissolving testing and had higher bending strength than that of set epoxy resin. DMA and TGA results showed epoxidized PF resins had lower heat activity, higher stiffness, and better heat resistance than that of epoxy resin.
|Appears in Collections:||第37卷 第01期|
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