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洗碗工

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[交流] 【求助】聚合电解质的分子量大小影响自组装吗？

我想做PAH和PAA自组装，文献上用的是分子量分别为7万和9万，但是我买不到这种分子量的，PAH有分子量为1.5万的，PAA有分子量为1800和45万的。请问各位高手，分子量大小对自组装有影响吗？

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1楼2011-04-07 17:27:09

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Few studies have systematically investigated the influence of
polymer molecular weight (MW) on the physical properties of
PEM, whether for synthetic polyelectrolytes[44] or for natural
polyelectrolytes. One of the reasons is the difficulty in obtaining
monodispersed polymers, especially for natural polyelectrolytes
which have very diverse production methods and are subjected to
natural variation. Kujawa et al.[45] found that CHI/HA film
thickness increased when the MW of these polysaccharides was
higher. However, this effect was only attributed to a difference in
film growth onset and not to actual differences in mass deposited
per layer. Lynn and co-workers[35] used the (PAH/PAA) synthetic
film model to underline the importance of MW in the buildup
process. With lower MW PAA, they observed that growth
approached that of exponentially growing systems. The use of low
MW PAA instead of a higher MW (the one commonly used and
commercially available) made it possible to diffuse it within these
films, resulting in thicker and exponentially growing films. Such
differences in diffusion were also observed by Porcel et al.,[46] who
studiedMWchanges in the PLL/HA system. Changes in PLL and
HA MWdid not significantly affect the mass deposited per layer,
but the use of highMWPLL did restrain PLL diffusion within the
upper part of the film. Most of the investigations that focused on
the influence of polymer length essentially studied the influence
on the film growth curve and thickness, with other properties,
mechanical, for example, rarely investigated.[47] Overall, both the
nature of diffusing specie and its length are important.
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