【正文】 micelle nucleation, water phase nucleation and monomer droplet nucleation, rather than two parts. In other words, the nucleation sites increased. When the monomer content is fixed, with increase of the nucleation sites, the number of the particles increases and the particle size decreases. Therefore, the semicontinuous feeding mode is favorable to form the smaller particles exhibiting a higher transmittance[(A)] and a lower refractive index[(B)].北方民族大學(xué)學(xué)士學(xué)位論文303 Effect of the Feeding Modes on the Viscosity Average Molecular Weight of the Obtained PMMAWhen the monomer content is 30% and the weight ratio of the emulsifier to the monomer is 1/30 in the feed, the viscosity average molecular weights of the PMMA obtained by the batch and the semicontinuous feeding modes are 106 and 106, respectively, which are of the same order of magnitude, indicating that in the experimental, the monomer feeding modes have only a little effect on the molecular weight of the obtained polymers.4 Effect of the Feeding Modes on the Glass Transition Temperature of the Obtained PMMA(A) and 4(B) are the 。在此謹(jǐn)向張老師致以最衷心的感謝與敬意!同時(shí)，我要向在大學(xué)四年中，所有給予我關(guān)懷、鼓勵(lì)并諄諄教導(dǎo)我的老師們表示忠心的感謝！ 本文在寫作過(guò)程中參考了大量的文獻(xiàn)資料，主要文獻(xiàn)資料已列出來(lái)，在此向所有的作者表示謝意！北方民族大學(xué)學(xué)士學(xué)位論文24參考文獻(xiàn)[1] 王晶，[J] ，化學(xué)與黏合， 2022，32（3）：57~60.[2] 劉丹丹，曾幸榮等. 聚合條件對(duì)丙烯酸酯微乳液粒徑及其分布的影響[J]，中國(guó)膠黏劑，2022,20（1）:22~26.[3] 陳均，[J] ，高分子通報(bào)， 2022， （5）：63~66.[4] 楊在林，王華鋒， [J]，應(yīng)用科技.[5] 余遠(yuǎn)斌，石飛．新型苯丙乳液聚合的研究[J] ，北京工業(yè)大學(xué)學(xué)報(bào)， 1996，(3)：7~13.[6] 李干佐，[M] ，北京: 石油工業(yè)出版社，1999．[7] 白瑋，、制備與應(yīng)用Ⅱ.結(jié)構(gòu)化微乳液[J]，高分子通報(bào)，2022， （12）：55~67.[8] 、表征方法及應(yīng)用[J] ，化工職業(yè)技術(shù)教育，2022，3.[9] 金鳳友，王可答，[J]，綏化學(xué)院學(xué)報(bào)，2022，6（28）:168~170.[10] 劉玉勇．微乳液聚合研究進(jìn)展[J] ，膠體與聚合物， 2022，04：32~36．[11] 成國(guó)祥，張仁柏， Fe3O4 納米微粒 制備[J]．兵器材料科學(xué)與工程，1998 ，21(6):27~30．[12] 萬(wàn)波，王得寧．反應(yīng)型乳化劑的合成及其在乳液聚合中的應(yīng)用[J]，合成橡膠工業(yè)，2022，26(2)：94~97 ．[13] 羅正湯，候有軍，寧平，曾繁森．涂料用丙烯酸酯苯乙烯超微乳液的研究[J] ．華南理工大學(xué)學(xué)報(bào)(自然科學(xué)版)，2022，29(3)：71~74．[14] 張勻，王虹，[J]，化學(xué)工業(yè)與工程，2022,25（1）.[15] 徐相凌，張志成，吳欣，等．苯乙烯微乳液種子聚合[J]．高等學(xué)校化學(xué)學(xué)報(bào)，1998，19(2)：112~116 ．[16] 張恒，紀(jì)秀麗， [J]，化學(xué)研究與應(yīng)用，2022，22（5）:583~586.[17] [J] ，合成材料老化與應(yīng)用， 2022,38（4）:7~11.[18] 孟丹，陳爾凡等 . 丙烯酸(酯)/苯乙烯微乳液的制備及表征 [J]，沈陽(yáng)化工學(xué)院學(xué)報(bào)，2022，19（3）:196~199.[19] 李淑娟，韓穎等. 低乳化劑含量丙烯酸酯微乳液的合成與性能 [J]，中國(guó)膠黏劑，2022，20（8）:460~463.北方民族大學(xué)學(xué)士學(xué)位論文25[20] 吳躍煥， [J]，應(yīng)用化學(xué)，2022,25（2）：218~223.[21] 黃璐，羅文佳，[J]，印染，2022,20.[22] 徐天柱，徐軍，[J]，中國(guó)膠黏劑，2022,19（3）:24~27.[23] 滕大勇，徐俊英， [J]，化工技術(shù)與開發(fā)，2022,40（10）:29~31.[24] 王玉標(biāo)，劉國(guó)軍， [J]，涂料工業(yè)，2022,41（9）:13~17.[25] 郝京誠(chéng)，[J] ，分子催化， 1997,11（2）:157~159.[26] 黃淼淼，河南科技，2022， （2）：62~63.北方民族大學(xué)學(xué)士學(xué)位論文26附錄一：英文文獻(xiàn)Microemulsion Polymerization of Methyl MethacrylateThe microemulsion polymerization of methyl methacrylate was studied. The effects of feeding modes on the structure and the properties of the obtained polymer microlatex were investigated by measuring the conversion, the transmittance and the refractive index of the latex, and by measuring the particle size ,the molecular weight and the glass transition temperature(Tg) of the polymers. The results show that pared to the batch feeding mode, the semicontinuous feeding mode is more favorable to from a PMMA microlatex with a higher transmittance, a smaller particle size, a higher molecular weight and a higher Tg. And the obtained PMMA microlatex has a 30%~40%(mass fraction) polymer content, a emulsifier/water weight ratio, a emulsifier/monomer weight ratio and a 17 nm average particle diameter, which is very important for the industrialization of the microemulsion polymerization technique.Keywords Microemulsion polymerization, Methyl methacrylate, Feeding mode, Particle sizeIntroductionMicroemulsion polymerization is a new and effective approach for preparing nanosize polymer materials which can be widely used in paints, adhesive, and functional materials. Recently, this technique has attracted more and more attention. According to the literatures, the systems concerned with microemulsion polymerization, which were extensively studied, were styrene(St) and methyl methacrylate(MMA) and the researches were focused on the kiics of the polymerization, the controllability of the particle size as well as the structure of the particles. But there have still existed a lot of problems in the field needed to be solved, such as higher weight ratios of water(usually higher than ) and emulsifier to monomer(usually higher than 1), lower polymer content(usually lower than 10%~30%, mass fraction), and the higher price of the used cationic emulsifier as well as the usage of cosurfactants. Those problems have greatly restricted the industrialization of the microemulsion polymerization and hence restricted the application of the technique. In this work, we tried to prepare a PMMA microlatex with a lower emulsifier/water mass ratio(), a lower emulsifier/monomer mass ratio(≤) and a higher polymer content(30%~40%, mass fraction) and without any cationic emulsifier and cosurfactant via a new microemulsion polymerization adopting different feeding modes to study the effects of the feeding modes on the structure and the properties of the obtained PMMA microlatex so as to provide a new approach for preparing nanosize polymer materials.Experimental北方民族大學(xué)學(xué)士學(xué)位論文271 MaterialaMethyl methylacrylate(MMA) was purchased from the Chengdu Rongfeng Chemical Factory(China) and purified by rectification. Potassium persulfate(KPS) and sodium dodecyl sulfate(SDS) were the products of the Beijing Chemical Faactory(China) and the Wuhan Chemical Factory(China), respectively, and both the chemicals were of analysis grade. Deionized water was used for all the experiment.2 Microemulsion Polymerization of MMAThe microemulsion polymerization of MMA was carried out in a threenecked 250mL roundbottom flask equipped with a reflux condenser, a mechanical stirrer and a thermometer by adopting either semicontinuous feeding mode or batch feed