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題名 | 硬化劑添加量對環氧樹脂/酚液化柳杉摻合樹脂硬化性及膠合性能之影響=Effect of the Amount of Hardener on the Curing Behavior and Bonding Properties of Blended Resins Prepared by Mixing Epoxy Resin with Phenol-liquefied Cryptomeria japonica |
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作者 | 康甄玲; 陳奕君; 李文昭; | 書刊名 | 林產工業 |
卷期 | 35:2 2016.06[民105.06] |
頁次 | 頁97-105 |
分類號 | 467.4 |
關鍵詞 | 摻合樹脂; 膠合強度; 柳杉; 環氧樹脂; 酚液化木材; Blended resins; Bonding strength; Cryptomeria japonica; Epoxy resins; Phenol-liquefied wood; |
語文 | 中文(Chinese) |
中文摘要 | 本研究利用雙酚A(Bisphenol A)與環氧氯丙烷(Epichlorohydrin)反應合成環氧樹脂(Epoxy resin),另將柳杉(Cryptomeria japonica Don.;Japanese cedar)木粉以酚為溶劑,鹽酸及硫酸為催化劑進行液化處理分別得LW-C及LW-S兩種液化柳杉。隨後將環氧樹脂與液化柳杉以重量比100/50混合製備摻合樹脂,並添加樹脂液重8、10及12 phr(Parts per hundred parts of resin)之三乙基四胺(Triethylene tetramine;TETA)為硬化劑,探討不同硬化劑添加量對摻合樹脂膠化性及膠合性能之影響。由結果得知,摻合樹脂添加TETA後可在室溫環境下硬化,其硬化過程為一放熱反應,隨TETA添加量增加,樹脂液在硬化過程之最高放熱溫度提高,膠化時間縮短,硬化樹脂溶出試驗重量保留率增大。熱示差掃描卡量分析(Differential scanning calorimetry;DSC)顯示,混合LW-C之摻合樹脂所進行之架橋反應程度大於混合LW-S者,前者以硬化劑添加量10 phr有最大之反應熱,後者則隨硬化劑添加量增加,硬化反應熱提高。混合LW-C之摻合樹脂之常態膠合強度可達CNS 11031號「結構用集成材」標準中對樹種區分編號第1類9.6 MPa之要求,且其膠合強度隨硬化劑添加量增加而提高,然混合LW-S者之膠合強度則隨硬化劑添加量增加而降低,其中僅添加量8 phr者可符合標準中之強度要求。 |
英文摘要 | In this study, epoxy resin was synthesized by reacting bisphenol A with epichlorohydrin. Liquefied woods, named LW-C and LW-S, were obtained by liquefying Cryptomeria japonica wood powders in phenol with HCl and H2SO4 as the catalyst, respectively. The blended epoxy resins were prepared by mixing epoxy resin with liquefied C. japonica wood with the weight ratio of 100/50. Triethylene tetramine (TETA) with the weight of 8, 10 and 12 phr (parts per hundred parts of resin) was added as a hardener. The influence of the amount of the hardener on the curing behavior and bonding properties of blended resins were investigated. The experimental results showed that blended resins could cure under room temperature when TETA was added. The setting process underwent an exothermic reaction. Increasing the amount of TETA, the maximum exothermic temperature of the resins during curing reaction raised, the gel time shortened, and the weight retention of cured resins after solvent dissolving test increased. The differential scanning calorimetry analysis (DSC) showed that blended resins prepared by mixing with LW-C had a higher degree of crosslink reaction than that with LW-S. Adding 10 phr of hardener had the largest reaction heat for the former. But the curing reaction heat would increase with the amount of hardener increased for the latter. Blended resins mixed with LW-C had the dry bonding strength over 9.6 MPa which could meet the requirement of CNS 11031 standard "Structural glulam" for the first category of wood species. Increasing the amount of the hardener, the bonding strength of the blended resins mixed with LW-C would enhance. However, the bonding strength would be weakened when the amount of the hardener increased for that mixed with LW-S. Among which, only 8 phr of hardener added could meet the requirement. |
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