環氧樹脂及環氧化Novolac樹脂性質之比較

Comparison of the Properties of Epoxy Resin and Epoxidized Novolactype Phenol-formaldehyde Resins

謝漢民(Han-Min Hsieh) ； 李文昭(Wen-Jau Lee)

《林業研究季刊》 37卷1期 (2015/03) Pp. 55-63

摘要

本研究利用雙酚A與環氧氯丙烷反應合成Epoxy樹脂，利用化石酚及液化柳杉為原料之Novolac樹脂與環氧氯丙烷反應合成環氧化PF樹脂（E-PF、E-LWPF）。比較三種含環氧基樹脂之環氧當量、重量平均分子量、膠化特性及分子結構。並利用三乙基四胺（TETA）為架橋硬化劑，探討常溫硬化樹脂之物理、機械及熱性質。由結果得知，Novolac樹脂之OH基可與環氧氯丙烷反應而轉換成環氧基，其中E-PF所含環氧基數量大於Epoxy及E-LWPF。三種含環氧基樹脂添加TETA為架橋硬化劑可常溫硬化，其中E-PF之硬化性與Epoxy相當，E-LWPF則較緩和。DSC熱分析顯示E-PF在硬化過程發生較多之架橋反應。硬化後之環氧化PF樹脂之溶出試驗重量保留率及抗彎強度大於Epoxy樹脂。DMA及TGA結果顯示，環氧化PF樹脂有較低之熱活動性，較大剛性及較佳之熱抵抗能力。

關鍵字

柳杉 ； 環氧化Novolac樹脂 ； 環氧樹脂 ； 液化木材 ； 酚醛樹脂

並列摘要

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.

並列關鍵字

＂Cryptomeria japonica＂ ； Epoxidized novolac resins ； Epoxy resins ； Liquefied wood ； Phenolformaldehyde resins