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通过负染色与冷冻蚀刻透射电子显微镜(TEM)、流变学性能测试等方法,研究了以1.0代聚酰胺-胺(PAMAM)为核心、以(PO)m(EO)n(其中PO与EO分别是环氧丙烷、环氧乙烷的缩写,m和n分别代表嵌段中PO和EO的个数)为辐射臂的树枝状大分子与双十二烷基二甲基溴化铵(DDAB)的分子间相互作用,并将此混合体系的聚集行为、流变学特性与DDAB的囊泡体系进行了比较.研究表明,由于DDAB分子可能插入到树枝状大分子聚集体的疏水微区中,使得混合体系中DDAB类似于凝胶的结构几乎被破坏,随其浓度的增加,混合体系中仅形成了DDAB单层囊泡及其与树枝状大分子构成的复合物,导致剪切后的黏度大幅下降,同时体系几乎不再具有黏弹性特征.
(PO) m (EO) n (PO and EO) were studied by means of negative staining and freeze-thaw transmission electron microscopy (TEM) and rheological property test. Respectively, the abbreviation of propylene oxide and ethylene oxide, m and n represent the number of PO and EO in the block, respectively) as the radiating arm dendrimer and didodecyldimethylammonium bromide (DDAB ), And the aggregation behavior and rheological properties of DDAB were compared with that of the DDAB vesicle system.Research shows that because DDAB molecules may be inserted into the hydrophobic domains of dendrimer aggregates , The structure of DDAB is almost destroyed in the mixed system. With the increase of concentration, DDAB monolayer and its complex with dendrimer are formed in the mixed system, Viscosity drops dramatically, while the system almost no longer has viscoelastic properties.