Citation: YANG Yi-Qun, YI Cheng-Lin, WANG Yi-Hua, JIANG Jin-Qiang, LIU Xiao-Ya. Self-Assembly and Emulsification of the Alternating Copolymer P(St-alt-Ma-Dopa)[J]. Acta Physico-Chimica Sinica, 2009, 25(11): 2225-2231. doi: 10.3866/PKU.WHXB20091011
交替共聚物P(St-alt-Ma-Dopa)的自组装及乳化性能
以二甲亚砜(DMSO)为溶剂, 用多巴胺(Dopamine)胺解聚(苯乙烯-alt-马来酸酐)(P(St-alt-Man))制备双亲交替共聚物P(St-alt-Ma-Dopa). 在选择性溶剂(N,N-二甲基甲酰胺(DMF)/水)中对P(St-alt-Ma-Dopa)进行溶液自组装, 用紫外分光光度计(UV)、透射电镜(TEM)、荧光探针技术、zeta电位仪等技术研究了添加剂(HCl, NaOH或NaCl)对P(St-alt-Ma-Dopa)自组装行为的影响及其胶体粒子的乳化性能. 结果表明, P(St-alt-Ma-Dopa)链在选择性溶剂(DMF/水)中可自组装形成球状胶体颗粒, 其临界聚集水含量(CWC)明显大于P(St-alt-Man). 体系的pH值、盐浓度等对P(St-alt-Ma-Dopa)胶体粒子的性质(粒子大小、zeta电位、亲疏水性等)有较大的影响, 引入多巴胺结构使交替共聚物胶体粒子的乳化性能有所提高.
English
Self-Assembly and Emulsification of the Alternating Copolymer P(St-alt-Ma-Dopa)
Using dimethylsulfoxide (DMSO) as solvent, an amphiphilic alternating copolymer P(St-alt-Ma-Dopa) was prepared by the ammonolysis of P(St-alt-Man) with dopamine. The influences of additives (HCl, NaOH, or NaCl) on the characteristics of P(St-alt-Ma-Dopa) colloidparticles after the self-assemblyof the copolymer in the selective solvent N,N-dimethylformamide (DMF)/H2O were studied by UV spectrophotometer, transmission electron microscopy (TEM), zeta potential measurements, and fluorescence probe. Results show that P(St-alt-Ma-Dopa) can self-assemble into spherical particles and its critical water content (CWC) is larger than that of P(St-alt-Man). The size, zeta potential, and hydrophilic-hydrophobic property of these colloid particles showed a series of regular changes after the addition of HCl, NaOH, or NaCl. The emulsification of P(St-alt-Ma-Dopa) colloid particles was improved because of the presence of dopamine.
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Key words:
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Self-assembly
- / Alternating copolymer
- / Colloid particle
- / Emulsification
- / Dopamine
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