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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Vesicle-Biopolymer Gels:Networks of Surfactant Vesicles Connected by Associating Biopolymers
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Vesicle-Biopolymer Gels:Networks of Surfactant Vesicles Connected by Associating Biopolymers

机译：囊泡-生物聚合物凝胶：通过缔合生物聚合物连接的表面活性剂囊泡网络

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摘要

The effect of adding an associating biopolymer to surfactant vesicles and micelles is studied using rheology and small-angle neutron scattering (SANS).The associating polymer is obtained by randomly tethering hydrophobic alkyl chains to the backbone of the polysaccharide,chitosan.Adding this polymer to surfactant vesicles results in agel;that is,the sample transforms from a Newtonian liquid to an elastic solid having frequency-independent dynamic shear moduli.SANS shows that the vesicles remain intact within the gel.The results suggest a gel structure in which the vesicles are connected by polymer chains into a three-dimensional network.-Vesicle-polymer binding is expected to occur via the insertion of polymer hydrophobes into the vesicle bilayer.Each vesicle thus acts as a multifunctional junction in the network structure.Significantly,gel formation does not occur with the native chitosan that has no hydrophobes.Moreover,adding the hydrophobically modified chitosan to a viscous sample containing wormlike micelles increases the viscosity further but does not give rise to a gel-like response.Thus,the formation of a robust gel network requires both the presence of hydrophobes on the polymer and vesicles in solution.
机译：使用流变学和小角度中子散射（SANS）研究了将缔合生物聚合物添加到表面活性剂囊泡和胶束中的效果。缔合聚合物是通过将疏水性烷基链随机束缚在多糖壳聚糖的骨架上而获得的。表面活性剂囊泡形成凝胶;也就是说，样品从牛顿液体转变为具有频率无关的动态剪切模量的弹性固体.SANS表明囊泡在凝胶中保持完整。结果表明，囊泡是凝胶结构通过聚合物链连接成三维网络。-有望通过将聚合物疏水物插入囊泡双层中而发生囊泡-聚合物结合，因此每个囊泡都在网络结构中充当了多功能连接点。天然的脱乙酰壳多糖不会产生疏水性。此外，将疏水改性的脱乙酰壳多糖添加到粘性样品中含有蠕虫状胶束的胶粘剂会进一步增加粘度，但不会产生类似凝胶的反应。因此，要形成牢固的凝胶网络，既需要在聚合物上也要存在疏水物，也需要溶液中的囊泡。

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