Microstructure and Self-Assembly of Supramolecular Polymers Center-Functionalized with Strong Stickers

详细信息    查看全文

• 作者：Cyril V茅chambre ; Xavier Callies ; C茅cile Fonteneau ; Guylaine Ducouret ; Sandrine Pensec ; Laurent Bouteiller ; Costantino Creton ; Jean-Marc Chenal ; Laurent Chazeau
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：November 24, 2015
• 年：2015
• 卷：48
• 期：22
• 页码：8232-8239
• 全文大小：482K
• ISSN：1520-5835

文摘

This manuscript describes the microstructure of a series of nearly monodisperse poly(n-butyl) acrylate (PnBA) chains center-functionalized with a triurea interacting moiety, able to self-associate by six hydrogen bonds. Different molecular weights have been investigated, from 5000 g路mol^鈥? up to 80鈥?00 g路mol^鈥?. For molecular weights (M_n) below 40鈥?00 g路mol^鈥?, X-ray scattering experiments and atomic force microscopy at ambient temperature clearly show that the systems organize as nanofibers hexagonally packed in oriented domains. This supramolecular structure explains the solid-like gel behavior of these polymers, which is suppressed at high temperature (at an order鈥揹isorder transition temperature). For higher molecular weights, nanofibers still form at ambient temperature but their concentration is too low to self-assemble in oriented domains. This is consistent with the reported viscoelastic behavior of these systems described in the companion paper.1