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首页> 外文期刊>Polymers for advanced technologies >Viscoelastic properties and self-healing behavior in a family of supramolecular ionic blends from silicone functional oligomers
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Viscoelastic properties and self-healing behavior in a family of supramolecular ionic blends from silicone functional oligomers

机译：来自硅氧烷功能性低聚物的超分子离子共混物系列中的粘弹性和自我愈合行为

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摘要

Supramolecular solid-like polymer gels were obtained, through acid-base interactions, starting from highly viscous amino-terminated and carboxylic-terminated telechelic PDMS oligomers, with different molecular weights, ranging approximately from 900 to 27 000 g/mol. The obtained blends were studied and characterized in terms of viscoelastic behavior, tensile properties, and self-healing abilities, with the aim of gaining a better understanding of structure-property relationships in these supramolecular ionic blends. IR spectroscopy confirmed the formation of supramolecular ionic interactions thanks to the presence of ammonium carboxylate group absorbance. Thermal analysis showed the formation of a crystalline phase at room temperature in some of the supramolecular blends when the molecular weight was lower than 27 000 g/mol. An increase in crystallinity by decreasing the chain length and therefore their molecular weights was also observed. These supramolecular PDMS materials showed self-healing abilities with a value of healing efficiency ranging from 25% up to 52%. Samples tested with creep recovery analyses showed a viscoelastic behavior. Interpolation of the creep curves according to the four-parameter Voigt model provides a relationship between the viscoelastic behavior of these PDMS materials and their self-healing abilities. Our results show how the control of the thermal, viscoelastic, and mechanical properties of these materials allows the design of supramolecular blends based on acid-base interactions with improved self-healing properties.
机译：通过酸碱相互作用，从端氨基和端羧基的高粘度遥爪PDMS低聚物开始，获得了具有不同分子量的超分子类固体聚合物凝胶，分子量范围约为900至27000 g/mol。研究并表征了所得共混物的粘弹性行为、拉伸性能和自愈合能力，目的是更好地理解这些超分子离子共混物的结构-性能关系。红外光谱证实了超分子离子相互作用的形成，这得益于羧酸铵基团的吸光度。热分析表明，当分子量低于27000 g/mol时，一些超分子共混物在室温下形成结晶相。还观察到通过减少链长和分子量来增加结晶度。这些超分子PDMS材料具有自修复能力，修复效率从25%到52%不等。蠕变恢复分析测试的样品显示出粘弹性行为。根据四参数Voigt模型对蠕变曲线进行插值，可以提供这些PDMS材料的粘弹性行为与其自愈能力之间的关系。我们的研究结果表明，通过控制这些材料的热、粘弹性和机械性能，可以设计基于酸碱相互作用的超分子共混物，从而改善自修复性能。

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