Self-healing polymer nanocomposites based on Diels-Alder-reactions with silica nanoparticles: The role of the polymer matrix
Self-healing polymer nanocomposites based on Diels-Alder-reactions with silica nanoparticles: The role of the polymer matrix
复制标题
DOI：
10.1016/j.polymer.2015.03.017
复制
发表时间：
2015-07
期刊：
影响因子：
4.6
通讯作者：
S. Schäfer;G. Kickelbick
中科院分区：
文献类型：
--
作者：
S. Schäfer;G. Kickelbick
研究了具有不同玻璃化转变温度的聚合物与表面功能化的二氧化硅纳米粒子的自愈合纳米复合材料。使用Stöber方法合成二氧化硅纳米颗粒，然后用偶联剂2-呋喃基-（十一碳烯基）-11-三乙氧基硅烷或3-马来酰亚胺丙基三乙氧基硅烷进行表面官能化。基于Diels-Alder（DA）化学，研究了所得纳米颗粒作为热触发自修复纳米复合材料中的交联剂。交联的纳米粒子与改性的聚（甲基丙烯酸丁酯）含有DA基团显示，刚性热塑性塑料只显示出低的倾向进行交联反应。相反，类似地改性的聚硅氧烷在DSC中以及在流变学测量中显示热可逆交联。结果表明，如果使用Diels-Alder基团作为交联剂，聚合物骨架的特定程度的流动性和柔性对于合理的快速自愈过程至关重要。
Self-healing nanocomposites were studied consisting of surface-functionalized silica nanoparticles and polymers with different glass transition temperatures. The silica nanoparticles were synthesized using the Stöber process and afterwards surface-functionalized with the coupling agents 2-furyl-(undecenyl)-11-triethoxysilane or 3-maleimidopropyltriethoxysilane. The obtained nanoparticles were studied as cross-linking agents in thermally triggered self-healing nanocomposites based on Diels-Alder (DA) chemistry. Cross-linking of the nanoparticles with modified poly(butyl methacrylates) containing DA groups revealed that the rigid thermoplasts show only low tendency to undergo the cross-linking reactions. Contrary, similarly modified polysiloxanes display thermally reversible cross-linking in DSC as well as in rheology measurements. The results reveal that a specific extent of mobility and flexibility of the polymer backbones is crucial for a reasonable fast self-healing process if Diels-Alder groups are used as crosslinking agents.