【作者】 荆正军；

【导师】 张超灿；

【作者基本信息】 武汉理工大学 ， 材料学， 2006， 硕士

【摘要】 本论文为了能得到有机硅聚合物-聚甲基丙烯酸甲酯梯度材料,以解决传统多次涂膜法存在的界面粘结问题。首先要让有机硅单体更好的乳化,所以用硫酸酯化反应,以聚醚改性聚硅氧烷为原料,合成了聚醚改性聚硅氧烷硫酸酯钠乳化剂,该乳化剂属于非离子、阴离子复合型乳化剂。经实验发现,与未进行硫酸酯化的乳化剂相比,其浊点明显提高,能让常规乳液聚合更稳定的进行。 利用甲基丙烯酸甲酯(MMA)和自制的γ-甲基丙烯酰氧丙基三(三甲硅氧基)硅烷(TRIS)为原料,以聚醚改性聚硅氧烷硫酸酯钠、十二烷基硫酸钠和1-丙烯基-2-羟基烷机磺酸钠为复配乳化剂,采用单体乳液半连续滴加法,分别制备了有机硅均聚物(PTRIS)乳液、有机硅-甲基丙烯酸甲酯共聚物(P(MMA-co-TRIS))乳液和聚甲基丙烯酸甲酯(PMMA)乳液。用粒径分析仪,TEM测试了乳液的胶粒,并用IR,TEM,水滴接触角测试等方法对所制备的均聚物和共聚物膜进行了表征。结果表明:当乳化剂用量在6%～8%(相对单体量)、改性乳化剂、十二烷基硫酸钠和1-丙烯基-2-羟基烷机磺酸钠复配比为2:1:1、引发剂用量在0.8～1%(相对单体量)、聚合温度为80℃、搅拌速度在200～250rpm时,得到的均聚物和共聚物乳液稳定,而且粒径分布均匀;对于共聚物乳液来说,随着单体中TRIS含量的增加,所得聚合物膜的水滴接触角增加,即其表面能增加。 通过乳液共混成膜时发生自结构,本文以乳液共混法制备了有机硅聚合物-聚丙烯酸酯梯度复合材料。结果发现PTRIS和PMMA的相容性较差,加入不同聚合比例的共聚物P(MMA-co-TRIS)后相容性得到改善,并可以得到一面富集丙烯酸酯聚合物:然后结构渐变成另一面富集有机硅聚合物的梯度膜。更多还原

【Abstract】 In this theses,in order to get polysilane-polyacrylate gradient material and solve interfacial coherence problems which existents etraditional times coating process. First to get preferable emulsification for organosilicon monomer. The emulsifier, sodium polyether sulfovinate modified polysiloxane, was synthesized by sulfuric acid esterification between chlorosulfonic acid and polyether modified polysiloxane. It was a kind of nonionic and anionic mixed emulsifier. In experiments, it was found that the mixed emulsifier has higher cloud point, and was able to let emulsion polymerization more stable, compared with emulsifier unesterified.With sodium polyether sulfovinate modified polysiloxane, sodium lauryl sulfate and sodium 3-allyoxy-2-hydroxypropanesulfonate(COPS-l) as composite emulsifier system, using methyl methacrylate(MMA) and self-made monomer Y -[tris(trimethylsiloxy)silyl]propyl methacrylate(TRIS) as raw materials, we prepared the homopolymer of TRIS, MMA, and the copolymers (P(MMA-co- TRIS)) by means of semi-continuous method of monomer preemulsion.Used Zeta.PALS, TEM test .galactic colloidal particle was clearly observed. Then, IR, TEM, DMA and water contact angle measurements were utilized to study these polymers and their films. The result indicated that the stable homopolymer and copolymer emulsion with uniform size distribution was got, when the ratio of sodium polyether sulfovinate modified polysiloxane, sodium lauryl sulfate and sodium 3-allyoxy-2-hydroxypropanesulfonate was 2:1:1, the quantity of the emulsifiers ranged from 6% to 8%(relative to monomer), the quantity of initiator ranged from 0.8% to l%(relative to monomer), the stirring speed ranged from 200rpm to 250rpm, the polymerization temperature was 80 centigrade degree. As for the copolymer emulsion, the more the TRIS content in the monomers, the larger the water contact angle of their films became, namely, the surface energy of the copolymer films increased with the TRIS content in the monomers.The testing results indicated that adding different P(MMA-co-PTRIS) can improve the poor miscibility of PMMA and PTRIS. The obtained polysilane -polyacrylate gradient films showed no macro-interface with the silicone content reducing gradually from the top surface to the bottom one.更多还原