Supramolecular polymer gels formed from carboxy-terminated telechelic polybutadiene and polyamidine through amidinium-carboxylate salt bridge
Supramolecular polymer gels formed from carboxy-terminated telechelic polybutadiene and polyamidine through amidinium-carboxylate salt bridge
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DOI：
10.1002/pola.27187
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发表时间：
2014-07-01
影响因子：
--
通讯作者：
Endo, Takeshi
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文献类型：
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作者：
Furusho, Yoshio;Endo, Takeshi
在本文中，我们报道了基于脒-羧酸盐桥的聚丁二烯制备的本体超分子聚合物凝胶的制备和性能，强调了与基于羧酸和胺的成熟网络系统的区别。我们用羧基封端的遥爪聚丁二烯和主链上具有N,N-二取代乙脒基团的线性聚脒制备了基于脒羧酸盐桥的超分子聚合物凝胶。 FTIR 分析和小角 X 射线散射测量表明盐桥归因于通过三维网络形成的凝胶化。含有等摩尔量的羧基和脒基的超分子凝胶几乎没有观察到流动性，其在室温下表现出约1MPa的高G值和37℃的Tgel。为了进行比较，使用线性聚乙烯亚胺代替聚脒制备了由铵羧酸盐交联的超分子聚合物凝胶。羧基和仲氨基等摩尔量的凝胶在室温下表现出类似液体的流动性，G值约为0.01 MPa，FTIR分析表明，这是由于一定量的羧基以游离形式存在，没有形成盐。 (c) 2014 年 Wiley periodicals, Inc. J. Polym。科学，A 部分：聚合物。化学。 2014, 52, 1815-1824
In this article, we report the preparation and properties of the bulk supramolecular polymer gels prepared from a polybutadiene based on the amidinium-carboxylate salt bridge, highlighting the difference from a well-established network system based on carboxylic acid and amine. We have prepared the amidinium-carboxylate salt bridge-based supramolecular polymer gels from a carboxy-terminated telechelic polybutadiene and a linear polyamidine having N,N-di-substituted acetamidine group in the main chain. FTIR analysis along with Small angle X-ray scattering measurements indicated that the salt bridge was attributed to the gelation through three-dimensional network formation. Virtually no fluidity was observed for the supramolecular gel containing equimolar amounts of the carboxyl group and the amidine group, which showed a high G value of about 1 MPa at room temperature and a Tgel of 37 degrees C. For comparison, the supramolecular polymer gels crosslinked by ammonium-carboxylate salt were prepared using a linear polyethyleneimine instead of the polyamidine. The gel with equimolar amounts of the carboxyl group and the secondary amino group showed liquid-like fluidity with a G value of about 0.01 MPa at room temperature, which was attributed to the fact that a certain amount of the carboxyl group remained as its free form without salt formation, as evidenced by FTIR analysis. (c) 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 1815-1824