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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. from huiyisu@126.com |
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