本文選題：乳液聚合 + 乙烯基聚硅氧烷乳液��； 參考：《湖北大學(xué)》2011年碩士論文

【摘要】：有機(jī)硅聚合物是一類兼具有機(jī)/無機(jī)材料雙重特性的特種高分子,其具有許多優(yōu)異的理化性能,如耐高低溫性、耐候性、疏水性、生理惰性等,因而具有廣泛的用途。其中,有機(jī)硅乳液已經(jīng)被廣泛應(yīng)用于紡織印染、醫(yī)藥、交通等行業(yè)作為后整理劑、光亮劑、消泡劑、化妝品添加劑、藥物載體等。近20年來,八甲基環(huán)四硅氧烷(D4)開環(huán)乳液聚合制備線型聚二甲基硅氧烷(PDMS)的報(bào)道很多,而有關(guān)D4與其他含乙烯基有機(jī)硅單體的乳液共聚很少報(bào)道,特別是以堿催化開環(huán)乳液共聚制備含乙烯基聚硅氧烷(Vi-PDMS)大分子的研究鮮見報(bào)道。本文以氫氧化鉀(KOH)為催化劑,十六烷基三甲基溴化銨(CTAB)和辛基酚聚氧乙烯(10)醚(OP-10)為復(fù)合乳化劑,采用四甲基四乙烯基環(huán)四硅氧烷(D4Vi)、Y-(甲基丙烯酰氧)丙基三甲氧基硅烷(MPS)與D4共聚制備Vi-PDMS大分子乳液。 在D4/D4Vi的乳液共聚中,研究了復(fù)合乳化劑用量[E]及配比、KOH用量、環(huán)硅氧烷用量[M]及配比、反應(yīng)溫度對(duì)乳液性能(乳膠粒粒徑及其分布、乳膠粒子的ζ電位、聚合物的摩爾質(zhì)量、乳液穩(wěn)定性等)的影響。結(jié)果表明,聚合較佳條件為：復(fù)合乳化劑用量為乳液質(zhì)量的5.72%,CTAB與OP-10的質(zhì)量比為1：6,KOH用量為乳液質(zhì)量的0.191%,環(huán)硅氧烷用量為乳液質(zhì)量的30%以下,D4與D4Vi的質(zhì)量比為9：1,反應(yīng)溫度為80℃,反應(yīng)時(shí)間為8.5h；此條件下的表觀動(dòng)力學(xué)方程為Rp=k[E]0.18[KOH]0.59[M]0.75,表觀活化能為Ea=52.77kJ/mol; FTIR證明了D4和D4Vi發(fā)生了共聚反應(yīng)；TEM對(duì)乳膠粒子的形貌進(jìn)行了表征；TGA對(duì)共聚物的熱穩(wěn)定性進(jìn)行了表征；共聚物中乙烯基含量隨D4Vi用量的增大而增大。 在D4/MPS的乳液共聚中,研究了加料方式、復(fù)合乳化劑用量、KOH用量、D4用量、MPS用量、反應(yīng)溫度對(duì)乳液性能的影響。結(jié)果表明,采用單體連續(xù)滴加法可以提高共聚物的穩(wěn)定性；聚合較佳條件為：當(dāng)復(fù)合乳化劑用量為D4質(zhì)量的4%,CTAB與OP-10的質(zhì)量比為1：2,KOH用量為D4質(zhì)量的0.2-0.4%,D4用量為乳液質(zhì)量的20%,MPS用量為D4用量的2-4%,MPS在單體D4加完并恒溫反應(yīng)2-3小時(shí)后加入,反應(yīng)溫度為80℃；FTIR證明了D4和MPS發(fā)生了共聚反應(yīng)；TGA表明聚二甲基硅氧烷中接枝一定含量的MPS在一定范圍內(nèi)能提升聚合物的熱穩(wěn)定性；共聚物中乙烯基含量隨MPS用量的增大而增大,相對(duì)誤差也相應(yīng)增大。
[Abstract]:Silicone polymer is a kind of special polymer with dual properties of organic / inorganic materials. It has many excellent physical and chemical properties, such as high and low temperature resistance, weather resistance, hydrophobicity, physiological inertia and so on, so it has a wide range of applications. Silicone emulsion has been widely used as finishing agent, brightener, defoamer, cosmetic additive, drug carrier and so on. In the past 20 years, there have been many reports on the preparation of linear polydimethylsiloxane (PDMS) by ring-opening emulsion polymerization of octamethylcyclotetrasiloxane (D4), while the emulsion copolymerization of D4 with other vinyl silicone monomers has been rarely reported. In particular, the preparation of vinyl polysiloxane Vi-PDMS macromolecules by alkali catalyzed ring-opening emulsion copolymerization is rarely reported. In this paper, using potassium hydroxide (Koh) as catalyst, cetyltrimethylammonium bromide (CTAB) and octylphenol polyoxyethylene (10) ether as composite emulsifiers, Vi-PDMS macromolecular emulsion was prepared by copolymerization of tetramethyltetravinylcyclotetrasiloxane (tetramethyl tetravinylcyclotetrasiloxane) (D4ViO4) and D4 (methacryloxy) propyl trimethoxysilane (MPSs). In the emulsion copolymerization of D4/D4Vi, the amount of compound emulsifier [E] and the ratio of Koh, cyclosiloxane [M] and ratio, reaction temperature on emulsion properties (size and distribution of latex particles, 味 potential of latex particles, molar mass of polymer) were studied. Effects of emulsion stability, etc. The results showed that the optimum polymerization conditions were as follows: the mass ratio of compound emulsifier to OP-10 was 1: 6 Koh = 0.191% of emulsion mass, the mass ratio of cyclosiloxane to D4Vi was 9: 1, the mass ratio of cyclosiloxane to D4Vi was 9: 1, and the reaction temperature was 80 鈩，

本文編號(hào)：1778615