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題名 | 乳化系中活性自由基聚合反應機構之探討 |
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作 者 | 廖平喜; | 書刊名 | 技術學刊 |
卷期 | 6:1 1991.03[民80.03] |
頁次 | 頁77-82 |
分類號 | 467.42 |
關鍵詞 | 自由基; 乳化系; 活性; 聚合反應; 機構; |
語文 | 中文(Chinese) |
中文摘要 | 本研究選用三種不同性質的單體(SM,MMA,MAA),在乳化系統中分別就各種單體的極性,在水相的溶解度及在異相起始劑表面的吸附狀態等因素,探討這些因素對乳化聚合反應速率之影響,結果發現疏水性單體(SM)易行均一聚合反應,而親水性單體(MAA)則易行接枝聚合反應,這兩種聚合反應之競爭程度也受pH值影響,亦即pH值增大有利於SM之接枝聚合反應,同時疏水性第三成份物(苯、正己烷)會抑制SM聚合總反應速率,因此本文提出一個合理的反應機構來說明活性自由基的均一與接枝聚合反應之競爭途徑。 |
英文摘要 | The influences of the polarity, solubility in water, and adsorption on the heterogeneous initiator of three different monomers (SM, MMA, and MAA) on the reaction rate of emulsion polymerization were studied. It was found that the hydrophobic monomer (SM) reacted mainly via homopolymerization, while the hydrophilic monomer (MAA) reacted mainly via graft polymerization. The degree of these two competitive polymerization was also affected by pH value, i.e. the higher pH value the more graft polymerization. The presence of hydrophobic solvents (benzene or hexane) would restrain the overall rate of polymerization. Thus, a living radical mechanism was proposed to explain the competence of homepoly-merization and graft polymerization. |
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