植物纖維對環氧樹脂/酸酐系統硬化動力學之影響

Influence of plant fibers on the cure kinetics of an epoxy/anhydride resin

歐汀原(Ting-Yuan Ou)

指導教授 ： 石燕鳳

朝陽科技大學/理工學院/應用化學系碩士在職專班/碩士(2011年)

摘要

本研究利用示差掃描熱量分析儀(DSC)，以升溫法及恆溫法分析以酸酐系做為硬化劑，並分別在是否添加植物纖維的狀態下，環氧樹脂硬化之反應動力學。用動態量測被用來預測環氧樹脂的整體放熱反應，並利用 Kissinger及 Ozawa兩種模式計算出其活化能數值。實驗結果顯示植物纖維在反應動力學上呈現出一種促進環氧樹脂硬化反應的效果，致使其硬化反應之活化能降低。
這些方法可證實植物纖維對於其動力學上是促進反應亦或抑制反應。另外為求得轉化率對時間及溫度的關係，恆溫DSC法所得數據並以Kamal模式擬合。這兩種系統的實驗數據(純環氧樹脂及其複合材料)均顯示出具有自催化之行為。其中隨著添加植物纖維後，其硬化速率的增加是由於植物纖維上的氫氧基的催化作用。同時也發現到純環氧樹脂及其複合材料的轉化率隨著溫度與時間增加而增加，而添加纖維的複合材料其整體轉化率則是小於純環氧樹脂。

關鍵字

植物纖維 ； 硬化動力學 ； 複合材料 ； 環氧樹脂

並列摘要

The cure kinetics of an epoxy resin with and without plant fibers and cured with an anhydride hardener was investigated by isothermal and nonisothermal differential scanning calorimetry (DSC). Dynamic measurements were used to predict the total heat of reaction of the epoxy resin as well as its activation energy based on the methods of Kissinger and Ozawa. Plant fibers showed an accelerating effect on the reaction kinetics of the original epoxy resin as the activation energy was reduced.
With these methods the inhibition and acceleration effects of plant fibers on the kinetics have been demonstrated. To describe the dependence of the conversion on time and temperature, isothermal DSC data were fitted to an autocatalytic model developed by Kamal model. The experimental data for both systems (virgin epoxy and its composites) showed an autocatalytic behaviour. With the addition of plant fibers, the cure rate increased due to the catalytic role of hydroxyl groups of plant fibers. It was also found that the conversion of virgin epoxy resin and its composites increased with increasing time and temperature. For the plant fiber-containing material, the total conversion was less than the virgin resin.

並列關鍵字

plant fiber ； curing kinetics ； composite ； epoxy

參考文獻

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