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題名 | 以四價鈰離子誘發丙烯腈與聚乙烯醇之接枝共聚合反應研究 |
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作者 | 陳志勇; 楊政達; 郭人鳳; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷期 | 16:4 1985.10[民74.10] |
頁次 | 頁363-372 |
分類號 | 467 |
關鍵詞 | 丙烯腈; 四價鈰子; 共聚合反應; 接枝; 聚乙烯醇; 誘發; |
語文 | 中文(Chinese) |
中文摘要 | 本文以四價鈰離子(Ce⁺⁴)誘發丙烯腈與聚乙烯醇之接枝共聚合反應,探討Ce⁺⁴濃度、AN濃度、PVA濃度及PVA聚合度等對聚合反應行為、接枝效率、接枝程度及聚合物顆粒大小和數目的影響。發現(1)反應可生成穩定的乳液,且乳液顆粒的形成機構為均勻成核(homoqeneous nucleation)。(2)所形成的聚合物顆粒數目在反應初期急驟增加,爾後隨反應之進行而下降,至某一反應程度後卽保持定值。(3)Ce⁺⁴濃度、AN濃度及PVA聚合度等提高或PVA濃度下降,皆有助於接枝程度的提高;接枝效率則隨Ce⁺⁴濃度與PVA濃度及聚合度的增加而提高。(4)最後由實驗得Ce⁺⁴濃度、AN濃度與PVA濃度有關之乳液顆粒數目的實驗式:N[9064][fed1][Ce⁺⁴]□[AN]□[PVA]□。 |
英文摘要 | The graft copolymerization of acrylonitrile (AN) onto the polyvinyl alcohol (PVA) in aqueous solution at 6.5°C using the ceric ion type, Ce(IV) catalyst was studied. Grafting rate, grafting yields, size and number of polymer particles formed in various concentrations of Ce(IV), AN and PVA, and the degree of polymerization of PVA was investigated. The results show that the mechanism for the formation of polymer particles is of homogeneous nucleation. The number of polymer particles rapidly increases initially and then becomes constant. The grafting yield and efficiency increase with the increase of the concentration of Ce(IV), concentration of AN and degree of polymerization of PVA. The empirical equation obtained which relates the number of polymer particles of latex with the concentration of Ce(IV), AN and PVA is N[9064][fed1][Ce⁺⁴]□[AN]□[PVA]□. |
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