The effect of tacticity on the interfacial region between poly(methyl methacrylate) (PMMA) and silica in a PMMA/silica nanocomposite was investigated by differential scanning calorimetry (DSC), Fourier‐transform infrared spectroscopy (FT‐IR), and X‐ray diffraction (XRD). The glass transition temperature (T_g) values of the syndiotactic (st‐) and atactic (at‐) PMMA/silica nanocomposites are higher than those of the neat PMMA. Conversely, the T_g of the isotactic (it‐) PMMA/silica nanocomposite is slightly higher than that of the neat it‐PMMA. DSC and XRD results suggest that the restriction of the PMMA chain mobility in the silica nanoparticle interfacial region heightens as the syndiotactic content increases. FT‐IR results show that this phenomenon is caused by the interaction between the carbonyl group of PMMA and the silanol group on the silicon dioxide surface. Therefore, it can be concluded that the syndiotactic‐rich PMMA has a significantly different molecular mobility from that of the neat PMMA in the interfacial region with silica nanoparticle surface than isotactic‐rich PMMA.

中文翻译：

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聚合物纳米复合材料中聚（甲基丙烯酸甲酯）的立构规整度对二氧化硅与界面的影响。

通过差示扫描量热法（DSC），傅立叶变换红外光谱（FT-IR）和X射线研究了立构规整度对PMMA /二氧化硅纳米复合材料中聚甲基丙烯酸甲酯（PMMA）和二氧化硅之间的界面区域的影响衍射（XRD）。玻璃化转变温度（Ť_克的间同立构（的）值ST和无规立构的（ - ）在- ）PMMA /二氧化硅纳米复合材料比纯PMMA的高。相反地，Ť_克全同立构（的它- ）PMMA /硅石纳米复合材料是略高于纯的它‐PMMA。DSC和XRD结果表明，随着间规含量的增加，对二氧化硅纳米颗粒界面区域中PMMA链迁移率的限制增加。FT-IR结果表明，这种现象是由PMMA的羰基与二氧化硅表面的硅烷醇基之间的相互作用引起的。因此，可以得出结论，富含间同立构的PMMA与具有全同立构的PMMA相比，在具有二氧化硅纳米粒子表面的界面区域具有与纯净PMMA显着不同的分子迁移率。