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題名 | 合成條件對酚-山黃麻樹皮萃取物-甲醛共聚合樹脂熱硬化特性之影響=Effect of Synthesis Conditions on the Thermosetting Properties of Phenol-India Charcoal Bark Extractives-Formaldehyde Copolymer Resins |
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作者 | 李文昭; 宋憶青; | 書刊名 | 林產工業 |
卷期 | 25:1 民95.03 |
頁次 | 頁41-48 |
分類號 | 436.18 |
關鍵詞 | 樹皮萃取物; 熱示差掃描卡量儀; 山黃麻; 酚-萃取物-甲醛共聚合樹脂; Bark extractive; Differential scanning calorimetry; DSC; India charcoal; Phenol-extractive-formaldehyde copolymer resins; |
語文 | 中文(Chinese) |
中文摘要 | 本研究以山黃麻(Trema orientalis Blume, India charcoal)樹皮之鹼萃取物取代部分酚為原料製備PF樹脂,探討合成時甲醛/酚莫耳比(F/P=1.8、2.0、2.2)、氫氧化鈉/酚莫耳比(NaOH/P=0.4、0.55、0.7)及萃取物取代量(37、44、56、67%)等對所合成酚-樹皮萃取物-甲醛共聚合樹脂(PTF)性質之影響,並利用熱示差掃描卡量儀(DSC)分析不同合成條件PTF共聚合樹脂之熱硬化特性。由試驗結果得知,合成時之F/P莫耳比、NaOH/P莫耳比及萃取物取代量均影響PTF共聚合樹脂之粘度及膠化特性。F/P莫耳比較大者粘度較低,膠化時間較短;NaOH/P莫耳比較大者則粘度較低,膠化時間較長;隨萃取物取代量增加,其樹脂液之粘度增加,膠化時間延長。PTF共聚合樹脂合成時,F/P莫耳比、NaOH/P莫耳比較大者在熱硬化過程中僅出現高溫側縮合反應之放熱峰,而F/P莫耳比、NaOH/P莫耳比較小者則另出現低溫側加成反應之放熱峰。隨萃取物取代量增加,PTF共聚合樹脂有較大之反應活性,其起始熱硬化之Onest溫度及最高放熱峰溫度向低溫側偏移,活化能亦降低,然硬化時架橋程度較少,所釋放之反應熱較低。 |
英文摘要 | India charcoal (Trema orientalis Blume) bark extractive was used to replace part of phenol at the synthesis of PF resin. The influences of the molar ratio of formaldehyde to phenol (F/P=1.8, 2.0, 2.2), sodium hydroxide to phenol (NaOH/P=0.4, 0.55, 0.7) and the substitution amount of extractive for phenol (37, 44, 56, 67%) on the properties of phenol-extractive-formaldehyde copolymer resins (PTF) were investigated. The thermosetting properties of PTF copolymer resins made with various synthetic conditions were analyzed by differential scanning calorimetry (DSC). From the results, the molar ratio of F/P and NaOH/P and the substitution amount of extractive that used at resins synthesis would all influence the viscosity and gel time of PTF copolymer resins. PTF copolymer resins that made with higher F/P had lower viscosity and shorter gel time, and that made with higher NaOH/P had lower viscosity and longer gel time. Increased the amount of extractive replacement would rise the viscosity and prolong the gel time of PTF copolymer resins. At thermosetting process, PTF copolymer resins with higher F/P and NaOH/P appeared only one exothermic peak at higher temperature that contributed to the condensation reaction. But with lower F/P and NaOH/P, another exothermic peak contributed to the addition reaction was appeared at lower temperature. The PTF copolymer resin had higher reactivity when increased the amount of extractive replacement, their onset temperature and maximum exothermic peak temperature shifted to lower temperature, and activation energy decreased. But the degree of cross-linking would decrease and less reaction heat would release. |
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