CAJ | 학술논문

以苯乙烯(St)和甲基丙烯酸二甲氨乙酯(DMAEMA)为共聚单体,通过普通自由基溶液聚合合成了双亲性无规共聚物P(St-co-DM).用傅里叶变换红外(FTIR)光谱、核磁共振氢谱(1H NMR)、凝胶渗透色谱(GPC)和差示扫描量热(DSC)仪对聚合物结构进行表征.研究了共溶剂的性质对P(St-co-DM)自组装胶束结构及其乳化性能的影响.用透射电镜(TEM)和动态激光光散射(DLS)表征了自组装胶体粒子的形态、粒径大小及其分布.通过测量胶束在甲苯/水界面的接触角表征胶束表面性能.结果表明: P(St-co-DM)以四氢呋喃(THF)为共溶剂自组装时,胶束的临界聚集水含量较大,胶束表面亲水性较强,流体力学半径较大;用二氧六环或THF为共溶剂,水为选择性溶剂, P(St-co-DM)自组装可以得到外层松散、内层比较密实的球状胶束,用N,N-二甲基甲酰胺(DMF)为共溶剂时,胶束整体呈现比较密实的球状胶束;分别用DMF、二氧六环和THF为共溶剂制备的胶束,其接触角均值都小于90°,可形成O/W型(水包油型)乳液.乳化实验结果表明,以二氧六环和THF为共溶剂制备的胶束作为颗粒乳化剂制备的乳液性能较好.
이분을희(St)화갑기병희산이갑안을지(DMAEMA)위공취단체,통과보통자유기용액취합합성료쌍친성무규공취물P(St-co-DM).용부리협변환홍외(FTIR)광보、핵자공진경보(1H NMR)、응효삼투색보(GPC)화차시소묘량열(DSC)의대취합물결구진행표정.연구료공용제적성질대P(St-co-DM)자조장효속결구급기유화성능적영향.용투사전경(TEM)화동태격광광산사(DLS)표정료자조장효체입자적형태、립경대소급기분포.통과측량효속재갑분/수계면적접촉각표정효속표면성능.결과표명: P(St-co-DM)이사경부남(THF)위공용제자조장시,효속적림계취집수함량교대,효속표면친수성교강,류체역학반경교대;용이양륙배혹THF위공용제,수위선택성용제, P(St-co-DM)자조장가이득도외층송산、내층비교밀실적구상효속,용N,N-이갑기갑선알(DMF)위공용제시,효속정체정현비교밀실적구상효속;분별용DMF、이양륙배화THF위공용제제비적효속,기접촉각균치도소우90°,가형성O/W형(수포유형)유액.유화실험결과표명,이이양륙배화THF위공용제제비적효속작위과립유화제제비적유액성능교호.
Styrene monomer (St) and dimethylaminoethyl methacrylate monomer (DMAEMA) were used to synthesize the amphiphilic random copolymer P(St-co-DM) via free radical copolymerization. The polymer structure was characterized by Fourier transform infrared (FTIR) spectroscopy, 1H nuclear magnetic resonance (1H NMR) spectroscopy, gel permeation in chromatography (GPC), and differential scanning calorimetry (DSC). We investigated the influence on the microstructure of the P(St-co-DM) nanoscale micel es by self-assembly in three common solvents (co-solvent), and also investigated the effect of micel e structure on the emulsion properties. The morphologies and size distributions of the P(St-co-DM) col oid particles were studied by transmission electron microscopy (TEM) and dynamic light scattering (DLS). The results show that the more critical water content, the higher hydrophilic and the bigger hydrodynamic radius of the micel es are observed when tetrahydrofuran (THF) is used as co-solvent. When dioxane or THF is used as co-solvent, the P(St-co-DM) self-assembles into spherical micel es with a relatively loose outer layer and a compact inner layer. In the case of N,N-dimethylformamide (DMF), particles are distributed uniformly inside the spherical micel es. The hydrophilic properties of the micel es were characterized by recording the contact angle for the toluene/water interface. The contact angles of al the micel es are less than 90° . The O/W type (oil-in-water type) emulsions were obtained for three co-solvents. The type of emulsions was determined by drop test. The emulsifier experiment shows that the solid particulate emulsifiers have excel ent emulsifying properties for dioxane and THF as co-solvents.