環(huán)硅氧烷陽離子乳液聚合動力學(xué)特征

材料科學(xué)論文編號:CL102  論文字?jǐn)?shù):8195,頁數(shù):17

Ⅱ
 目  錄
中文摘要 I
英文摘要 II
目錄 III
1. 緒論 1
 1.1 有機(jī)硅工業(yè)簡介 1
 1.2 我國有機(jī)硅工業(yè)存在的問題及發(fā)展方向 2
 1.3 有機(jī)硅乳液聚合  3
 1.3.1 陰離子乳液聚合 4
 1.3.2 陽離子乳液聚合 5
 1.3.3 與氨基單體共聚 5
 1.4 課題的提出及研究內(nèi)容 6
2．實驗部分 7
 2.1 主要試劑與儀器 7
 2.2 實驗步驟 8
 2.3 樣品測試 8
3．結(jié)果與討論 9
 3.1 聚合速率的研究 9
 3.1.1 陽離子乳化劑用量的影響 9
 3.1.2 溫度的影響 10
 3.1.3 催化劑用量的影響 10
 3.2 單體擴(kuò)散傳遞的研究 11
4．總結(jié)與展望 14
致謝 15
參考文獻(xiàn) 16

摘 要：本文以十二烷基二甲基芐基溴化銨為陽離子乳化劑、KOH為催化劑、D4為單體進(jìn)行環(huán)硅氧烷陽離子乳液聚合，在此基礎(chǔ)上，討論聚合動力學(xué)特征以及聚合過程中單體的擴(kuò)散規(guī)律。研究結(jié)果表明：溫度升高，聚合速率增加，平衡轉(zhuǎn)化率在86%。陽離子乳化劑及KOH用量增加，聚合反應(yīng)速率也增加，至一定程度再下降。此外，當(dāng)聚合開始后，增溶膠束形成的乳膠粒聚合速率快，單體濃度低，單體液滴形成的乳膠粒聚合速率慢，單體濃度高，并隨聚合的進(jìn)行，由于擴(kuò)散的作用，兩者濃度差距變小，直至達(dá)到平衡狀態(tài)，兩者達(dá)到同樣的濃度。
關(guān)鍵詞：陽離子乳液聚合;環(huán)硅氧烷;乳液聚合，動力學(xué)特征

Abstract: This article take the lauryl dimethyl phenmethyl ammonium bromide as the positive ion emulsifier, KOH is the catalyst, D4 is the monomer carries on the link siloxanes positive ion emulsion polymerization, based on this, in discussion kinetics of polymerization characteristic as well as polymerization process monomer proliferation rule. The findings indicated: Temperature increment, the polymerization speed increases, balanced conversion rate in 86%. The positive ion emulsifier and the KOH amount used increases, the polyreaction speed also increases, drops again to the certain extent. In addition, after when gets together starts, increases the emulsoid partical polymerization speed which dissolves micellar forms to be quick, the monomer density is low, the monomer bubble forms the emulsoid partical polymerization speed is slow, the monomer density is high, and along with polymerization advance, because proliferates the function, both density disparity changes is small, until achieves the state of equilibrium, both achieve the similar density.
Key word: Positive ion emulsion polymerization; Surrounds the siloxanes; Emulsion polymerization, dynamics characteristic t