架橋硬化劑組成對環氧化Novolac樹脂機械性質及熱性質之影響

Effect of the Composition of Crosslinking Hardener on the Mechanical and Thermal Properties of Epoxidized Novolac Resin

謝漢民(Han-Min Hsieh) ； 李文昭(Wen-Jau Lee)

《中華林學季刊》 48卷1期 (2015/03) Pp. 87-96

摘要

本研究利用酚與福馬林於酸性條件下反應製備novolac樹脂，再將此樹脂與環氧氯丙烷反應形成環氧化novolac樹脂，並以不同重量混合比順丁烯二酸酐（Maleic anhydride；MA）及六亞甲基四胺（Hexamethy lenetetramine；Hexamine）混合物為架橋硬化劑，探討架橋硬化劑對環氧化novolac樹脂之硬化性及硬化樹脂機械性質及熱性質之影響。由DSC熱硬化性分析顯示採用MA／Hexamine混合架橋硬化劑者在熱掃描過程呈現兩階段硬化反應。在MA添加量0.5當量，Hexamine添加量5%之條件下，其硬化樹脂有較佳之抗彎強度。DMA及TGA結果顯示，採用混合型架橋硬化劑之硬化樹脂有較低之熱活動，較大之剛性及較佳之熱安定性。

關鍵字

架橋硬化劑 ； 硬化性 ； 環氧化Novolak樹脂樹脂 ； 酚醛樹脂 ； 熱性質

並列摘要

In this study, novolac resin was prepared by reacting phenol with formalin under acid condition, followed by reacting with epichlorohydrin to form epoxidized novolac resin. The mixture of maleic anhydride (MA) and hexamethylenetetramine (hexamine) with different weight ratios were used as the crosslinking hardener. The effect of crosslinking hardeners on the curing behavior was detected with DSC. The mechanical and thermal properties of cured epoxidized novolac resin were also investigated. DSC results showed a two-stage reaction during heat curing for that used MA/hexamine mixture as a crosslinking hardener. The resin cured with the mixture of 0.5 equivalent of MA and 5% of hexamine had the bending strength higher than others. DMA and TGA results showed that cured resins those with MA/hexamine mixtures as the crosslinking hardener had lower thermal activity, higher stiffness, and better thermal stability.

並列關鍵字

Crosslinking hardener ； Curing behavior ； Epoxidized novolac resins ； Phenol-formaldehyde resins ； Thermal properties