Structural effects of TiO2 nanoparticles in photocurable ladder-like polysilsesquioxane nanocomposites

被引:6
作者
Dire, Sandra [1 ,2 ]
Callone, Emanuela [1 ,2 ]
Ceccato, Riccardo [1 ,2 ]
Parrino, Francesco [1 ,2 ]
Di Credico, Barbara [3 ]
Mostoni, Silvia [3 ]
Scotti, Roberto [3 ]
D'Arienzo, Massimiliano [3 ]
机构
[1] Univ Trento, Dept Ind Engn, Via Sommar 9, I-38123 Trento, Italy
[2] Univ Trento, Klaus Muller Magnet Resonance Lab, Via Sommar 9, I-38123 Trento, Italy
[3] Univ Milano Bicocca, Dept Mat Sci, INSTM, Via R Cozzi 55, I-20125 Milan, Italy
关键词
Ladder-like polysilsesquioxanes; Methacrylate groups; TiO2; NMR; XRD; Structural properties; SOLID-STATE NMR; HARD COATING FILMS; MECHANICAL-PROPERTIES; HYBRID FILMS; SPECTROSCOPY; PERFORMANCE; KINETICS;
D O I
10.1007/s10971-023-06127-5
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Ladder-like polysilsesquioxanes (LPSQs) are characterized by a double-stranded siloxane backbone, whose chemical and structural properties depend on both the synthesis parameters and the nature of the organic side-chains. In the case of ladder-like (methacryloxypropyl) polysilsesquioxanes (LPMASQ), polymer matrices can be produced by exploiting the presence of photocurable methacrylate groups. Consequently, they can be used to prepare functional nanocomposites (NCs), either by blending with organic polymers such as polybutadiene or exploiting the inorganic fillers' dispersion. Since the properties of LPMASQ-based NCs are strongly related to their structure, the structural changes of polymerized LPMASQ were investigated upon addition of low loadings of TiO2 nanoparticles (up to 3 wt%) by solid state nuclear magnetic resonance and X-ray diffraction. The filler addition leads to the reduction of the polymerization capacity of the LPMASQ organic side-chains. Moreover, a different organization of ladder chains has been highlighted, ascribable to the increase in fully condensed linear ladder units at the expenses of folded chains and defective structures. The methodological approach here adopted can be extended to other composite systems and may help to describe the properties at the filler-matrix interface, offering valuable hints for a better design of these materials. [GRAPHICS] .
引用
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页码:1 / 13
页数:13
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