光敏共聚物P(St/VM-co-MA)自组装胶体粒子及其性能

以苯乙烯类光敏单体7-(4-乙烯基苄氧基)-4-甲基香豆素(VM)、苯乙烯(St)、马来酸酐(MA)为共聚单体,采用自由基聚合法制备了光敏性双亲共聚物P(St/VM-co-MA).在选择性溶剂(N,N-二甲基甲酰胺(DMF)/H2O)中对P(St/VM-co-MA)进行自组装,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.利用紫外光照使胶体粒子中香豆素基元发生光二聚反应,形成交联胶体粒子,并用紫外-可见光分光光度计(UV-Vis)跟踪其交联过程.用DLS研究了交联和未经交联胶体粒子的粒径和结构稳定性,用激光扫描共聚焦显微镜(LSCM)和光学显微镜考察了胶体粒子的乳化、包覆性能.结果表明:交联和未经交联胶体粒子均具有乳化性,且在乳化过程中可实现对油溶性染料的包覆.胶体粒子交联后,粒径有所减小,结构稳定性、乳化性能、包覆性能均有所提高.

Self-Assembled Colloid Particles and Properties of the Photosensitive Copolymer P(St/VM-co-MA)

A photosensitive amphiphilic copolymer P(St/VM-co-MA) was synthesized from styrene (St), a styrene-containing photosensitive monomer 7-(4-vinylbenzyloxy)-4-methyl coumarin (VM), and maleic anhydride (MA) by free radical copolymerization. P(St/VM-co-MA) self-assembled into colloid particles in the selective solvent N,N-dimethylformamide (DMF)/H₂O. The morphologies, sizes, and size distributions of the colloid particles were characterized by transmission electron microscopy (TEM) and dynamic laser scattering (DLS). The P(St/VM-co-MA) colloid particles were photo-crosslinked by the photodimerization of the coumarin groups under UV irradiation to form crosslinked colloid particles. The crosslinking process was monitored using UV-Vis spectroscopy. The sizes and stabilities of the crosslinked and non-crosslinked colloid particles were examined by DLS. Additionally, the emulsification and encapsulation of the colloid particles were studied by laser scanning confocal microscopy (LSCM) and optical microscopy. The results showed that both the crosslinked and non-crosslinked colloid particles possessed emulsifying properties. During emulsification the oil-soluble dye was encapsulated into the emulsion. When the colloid particles were crosslinked, they became smaller and their structural stability as well as emulsification and encapsulation were improved.