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題名 | 環氧樹脂/Novolac摻合樹脂之反應性及硬化樹脂之性質=Reactivity of Epoxy/Novolac Blended Resins and the Properties of Cured Resins |
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作者 | 謝漢民; 李文昭; | 書刊名 | 林產工業 |
卷期 | 34:3 2015.09[民104.09] |
頁次 | 頁135-141 |
分類號 | 436.51 |
關鍵詞 | 摻合樹脂; 硬化性; 環氧樹脂; Novolac樹脂; 三苯基磷; Blended resins; Curing behavior; Epoxy resins; Novolac resins; Triphenylphosphine; |
語文 | 中文(Chinese) |
中文摘要 | 本研究將柳杉(Cryptomeria japonica D. Don)木粉以酚為溶劑,HCl及H_2SO_4為催化劑進行液化處理,將酚及兩種液化柳杉與福馬林反應製備PF、C-PF及S-PF三種Novolac型PF樹脂,以雙酚A與環氧氯丙烷反應製備環氧樹脂(Epoxy resin)。隨後將Epoxy樹脂與Novolac樹脂以不同重量比混合調配摻合樹脂,並添加三苯基磷為催化劑。以熱示差掃描卡量儀(Differential scanning calorimeter;DSC)分析其硬化特性,硬化摻合樹脂以溶出試驗測定膠化度,以強度試驗機測定其抗彎性質,以動態熱機械分析儀(Dynamic mechanical analyzer;DMA)分析其粘彈特性。DSC結果顯示Novolac樹脂與Epoxy樹脂可在高溫條件下發生架橋反應,然添加催化劑三苯基磷可降低熱硬化所需溫度。硬化摻合樹脂為同質分子結構,隨Novolac所占比例增加,溶出試驗重量保留率、抗彎強度、儲存模數提高,阻尼值波峰高度降低,最高峰溫度向高溫側偏移。液化木材為原料之Novolac所調配摻合樹脂之架橋反應程度較低,硬化摻合樹脂之重量保留率、抗彎強度、儲存模數較小,相轉移前後之儲存模數差異較大。利用C-PF與S-PF所調配摻合數之比較,C-PF摻合樹脂之性質優於S-PF。 |
英文摘要 | Wood powders of Cryptomeria japonica were liquefied in phenol with HCl and H_2SO_4 as a catalyst. Novolac-type phenol formaldehyde resins i.e. PF, C-PF and S-PF, were prepared by reacting phenol and two kinds of liquefied wood with formalin. Epoxy resin was prepared by reacting bisphenol A with epichlorohydrin. Blended resins were prepared by mixing novolac resin and epoxy resin with different weight ratios and the triphenylphosphine was added as a catalyst. The curing behavior of blended resins was detected by differential scanning calorimetry (DSC). After curing, the gel degree, bending properties and viscoelastic behaviors were measured by dissolving test, universal strength test machine and dynamic mechanical analyzer (DMA), respectively. The DSC results show that crosslink reaction could occur between novolac resin and epoxy resin. However, the temperature needed for curing reaction could be decreased when triphenylphosphine was added as a catalyst. The cured blended resins have the homogeneous molecular structure. When the proportion of novolac increased, the weight retention of dissolving test, the bending strength and the storage modulus of blended resins could be raised. In addition, the height of damping peak would be decreased and shifted to higher temperature. Blended resins that were prepared with liquefied wood-based novolac resin had lower crosslinking degree. The cured resins had lower weight retention, bending strength and storage modulus than that with PF and had a larger variance of storage modulus before and after phase transition. Comparison between C-PF and S-PF, blended resin prepared with C-PF had better properties than that with S-PF. |
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