两亲性乙基纤维素接枝松香聚合物的合成及自组装

通过可逆加成断裂链转移聚合法（RAFT）将脱氢枞酸(2-甲基丙烯酰氧基异丙醇基)酯（DAGMA）单体接枝到乙基纤维素上合成了全生物质基两亲性的乙基纤维素-聚脱氢枞酸(2-甲基丙烯酰氧基异丙醇基)酯共聚物（EC-g-PDAGMA），并制备了聚合物自组装胶束。利用核磁共振氢谱（¹H NMR）、凝胶色谱仪（GPC）对聚合物的结构进行了表征，证实成功合成了EC-g-PDAGMA。由于脱氢枞酸的引入，EC-g-PDAGMA接枝共聚物具有明显的紫外吸收性能。利用动态光散射（DLS）和透射电子显微镜（TEM）对聚合物自组装胶束的粒径、胶束溶液的Zeta电位和形貌进行了表征。结果表明，EC-g-PDAGMA共聚物在选择性溶剂THF/H₂O中能够进行自组装形成规整的球形胶束，并且其大小随着聚合物浓度和分子链长而变化，粒径分布较窄，同时胶束具有良好的储存稳定性。

Synthesis and self-assembly of amphiphilic ethyl cellulose grafted dehydroabietic moiety polymer

Novel biomass-based amphiphilic ethyl cellulose grafted 2-methcryloyloxyisopropanol ester of dehydroabietic acid (EC-g-DAGMA) copolymers was synthesized through the RAFT polymerization，and self-assembled micelles were prepared in the selective solvent THF/H₂O. The structure and molecular weight of the polymer was characterized by ¹H NMR and gel permeation chromatography (GPC)，which confirmed the successful synthesis of EC-g-PDAGMA. The amphiphilic copolymers showed an excellent UV absorption ability due to the presence of rosin based side chains. Dynamic light scattering (DLS), zeta-potential measurement and transmission electron microscopy (TEM) were used to study the self-assembly behavior of the EC-g-DAGMA copolymers. The results showed that the EC-g-PDAGMA copolymers could self-assemble to micelles in the selective solvent THF/H₂O with regular spherical morphology and good stabilities. Moreover, the diameters of micelles were influenced by the polymer concentration and molecular weights.