Effect of tacticity of poly(methyl methacrylate) on interfacial region with silica in polymer nanocomposite
Effect of tacticity of poly(methyl methacrylate) on interfacial region with silica in polymer nanocomposite
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DOI：
10.1002/pen.25556
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发表时间：
2020-10
影响因子：
3.2
通讯作者：
K. Matsuura;K. Kuboyama;T. Ougizawa
中科院分区：
文献类型：
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作者：
K. Matsuura;K. Kuboyama;T. Ougizawa
采用差示扫描量热法（DSC）、傅里叶变换红外光谱（FT - IR）和X射线衍射（XRD）研究了弹性对PMMA/二氧化硅纳米复合材料中聚甲基丙烯酸甲酯（PMMA）与二氧化硅界面区域的影响。共规（st‐）和无规（at‐）PMMA/二氧化硅纳米复合材料的玻璃化转变温度（Tg）值高于整齐PMMA的玻璃化转变温度。相反，等规（it‐）PMMA/二氧化硅纳米复合材料的tg略高于neatit‐PMMA。DSC和XRD结果表明，PMMA链迁移率在二氧化硅纳米颗粒界面区的限制随着共规含量的增加而增强。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醇基相互作用引起的。因此，可以得出结论，富等规的PMMA在与二氧化硅纳米颗粒表面的界面区域比富等规的PMMA具有明显不同于整齐PMMA的分子迁移率。
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 (Tg) values of the syndiotactic (st‐) and atactic (at‐) PMMA/silica nanocomposites are higher than those of the neat PMMA. Conversely, theTgof the isotactic (it‐) PMMA/silica nanocomposite is slightly higher than that of the neatit‐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.