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聚乙二醇/聚对二氧环己酮两亲性嵌段共聚物的合成及其自组装
发表时间：2013-04-15 浏览量：1467 下载量：442
| 全部作者： | 吴刚，刘昌蕾，陈思翀，王玉忠 |
| 作者单位： | 四川大学化学学院，环保型高分子材料国家地方联合工程实验室（四川），四川省降解与阻燃高分子材料高校重点实验室 |
| 摘 要： | 以单羟基或双羟基的聚乙二醇（PEG）为引发剂，在辛酸亚锡的催化下，引发对二氧环己酮（PDO）开环聚合。通过调控PEG的分子量以及单体投料比制备了一系列具有不同结构的两亲性两嵌段或三嵌段共聚物。采用核磁共振（nuclear magnetic resonance, NMR）对共聚物的结构进行了表征，通过凝胶渗透色谱（gel permeation chromatography, GPC）获得了共聚物的数均分子量、重均分子量和多分散系数等结构参数。采用芘荧光探针法（fluorescence probe method, FPM）和动态激光光散射(dynamic light scattering, DLS)对共聚物在水中的自组装进行了研究。荧光光谱(fluorescence spectrum, FS)的分析结果表明：共聚物能够在水中自组装形成纳米或微米聚集体，其临界聚集浓度（critical aggregation concentration, CAC）随疏水性的增强而减小，较小的CAC表明共聚物更容易自组装。DLS结果显示，当PEG分子量一定时，聚集体粒径随聚对二氧环已酮（PPDO）分子量的增大而增大。 |
| 关 键 词： | 高分子化学；嵌段共聚物；两亲性；自组装；聚乙二醇；聚对二氧环己酮 |
| Title： | Synthesis and self-assembly of poly (ethylene glycol)/ poly (p-dioxane) amphiphilic block copolymers |
| Author： | WU Gang, LIU Changlei, CHEN Sichong, WANG Yuzhong |
| Organization： | National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Degradable and Flame Retardant Polymer Materials, College of Chemistry, Sichuan University |
| Abstract： | Amphiphilic di-or tri-block copolymers were synthesized by bulk ring-opening polymerization of PDO using nomohydroxyl PEG or dihydroxyl PEG as macro-initiator, and Sn(Oct)2 as catalyst with different PEG molecuar weight and feed ratio. The structure of copolymers was characterized by nuclear magnetic resonance (NMR). Gel permeation chromatography (GPC) was used to determine molecular weight and molecular weight distribution of the copolymers. The self-assembling behavior of the copolymers were investigated by fluorescence probe method (FPM) and dynamic light scattering (DLS). The results of fluorescence spectrum (FS) showed that the copolymers could form nano/microparticle aggregates in aquesous solution, and the critical aggregation concentration (CAC) decreased with the hydrophobicity increasing of copolymers. In addition, the lower CAC indicated that the copolymers could self-assemble readily. The DLS results showed that when the molecular weight of PEG was stable, the particle size of copolymer increased with the increasing of PPDO molecular weight. |
| Key words： | polymer chemistry; block copolymer; amphiphilicity; self-assembly; poly(ethylene glycol); poly(p-dioxane) |
| 发表期数： | 2013年4月第7期 |
| 引用格式： | 吴刚，刘昌蕾，陈思翀，等. 聚乙二醇/聚对二氧环己酮两亲性嵌段共聚物的合成及其自组装[J]. 中国科技论文在线精品论文，2013，6（7）：625-630. |
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