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標題: 液化木材應用於環氧化Novolac型PF樹脂製備及其硬化樹脂之性質
Application of Liquefied Wood for Preparing Epoxidized Novolac-type Phenol-Formaldehyde Resins and the Properties of Cured Resins
作者: 謝漢民
Hsieh, Han-Min
關鍵字: Blended resins;掺合樹脂;Epoxidized PF resins;Moldings;Novolac-type PF resins;Phenol-liquefied;Cryptomeria japonica;環氧化PF樹脂;成型板;Novolac型PF樹脂;酚液化;柳杉
出版社: 森林學系所
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本研究將柳杉(Cryptomeria japonica; Japanese fir)木材以酚為溶劑,H2SO4或HCl為催化劑進行液化處理,並將酚液化柳杉及酚分別與福馬林在酸性條件下合成Novolac型PF樹脂;進一步則將此Novolac型PF樹脂與環氧氯丙烷反應製備環氧化Novolac型PF樹脂,並探討此環氧化Novolac型PF樹脂以三乙基四胺(Triethylene tetramine; TETA)、順丁烯二酸酐(Maleic anhydride; MA)、六亞甲基四胺(Hexamethylenetetramine; Hexamine)及MA/Hexamine混合物為架橋硬化劑之反應性;另探討將環氧樹脂與Novolac型PF樹脂直接混合所得掺合樹脂之硬化性。由試驗結果可知,柳杉木材於酚液體中進行液化處理時,以H2SO4為催化劑者有較佳之液化效果。以酚液化柳杉或酚為原料所製備之Novolac型PF樹脂添加Hexamine為架橋硬化劑後可加熱而形成三次元網狀結構之硬化樹脂;將此Novolac型PF樹脂混合填料木粉、Hexamine及硬脂酸鋅可熱壓製作成型板,其板材具有良好尺寸安定性及內聚強度。環氧化Novolac型PF樹脂以TETA為硬化劑時具備常溫硬化性;然採用MA、Hexamine及MA/Hexamine混合物為硬化劑者則須加熱硬化,DSC分析顯示添加MA/Hexamine混合硬化劑者在熱硬化過程具有兩個硬化放熱峰;採用MA/Hexamine混合硬化劑者,其硬化後之環氧化Novolac型PF樹脂有較佳之溶出試驗重量保留率、機械性質、儲存模數及熱性質;然硬化樹脂之性質隨液化木材所製備PF樹脂含量增加而降低。環氧樹脂與PF樹脂混合並添加三苯基磷(Triphenylphosphine; TPP)為催化劑時可加熱硬化,其中PF樹脂比例較高者其重量保留率、機械性質、儲存模數均較大。

In this study, Cryptomeria japonica (Japanese fir) was liquefied in phenol with H2SO4 or HCl as a catalyst. Novolac-type phenol-formaldehyde resins (PF) were synthesized by reacting phenol-liquefied wood or phenol with formalin under acid condition. The Novolac-type PF resins prepared were then reacted with epichlorohydrin to form epoxidized Novolac-type PF resins. The reactivity of epoxidized Novolac-type PF resins with triethylene tetramine (TETA), maleic anhydride (MA), hexamethylenetetramine (Hexamine) and the mixture of MA-Hexamine as cross-linking hardeners were investigated. In addition, the curing capability of directly blending epoxy resin with Novolac-type PF resins was investigated too. The result shows that wood of Japanese cedar liquefied with H2SO4 as the catalyst had a better effect than that with HCl as the catalyst. Both Novolac-type PF resins that prepared from phenol-liquefied wood and phenol could form three-dimensional setting-resins under heating after hexamine was added as the cross-linking hardener. Moldings with good dimensional stability and internal bonding strength could be made with the mixture of Novolac-type PF resin, wood powder, hexamine and zinc stearate under hot-pressing. Epoxidized Novolac-type PF resins possessed the capability of room temperature curing when TETA was used as the hardener. However, heating would be necessary for curing when MA, hexamine and the mixture of MA/Hexamine were used as hardeners. DSC analysis showed two exothermic peaks during heat-curing when MA/Hexamine mixture was used as the hardener. Cured epoxidized Novolac-type PF resins that used MA/Hexamine mixture as the hardener had better weight retention, mechanical properties, storage modulus and thermal properties than others. Nevertheless, the properties would reduce as the rate of liquefied wood-base PF resins increased. Epoxy resin that blended with PF resin and triphenylphosphine could cure under heating, and more the ratio of PF resin, higher the weight retention, mechanical properties and storage modulus would be.
其他識別: U0005-1808201119022100
Appears in Collections:森林學系

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