Effect of tetrahydrofuran on poly(methyl methacrylate) and silica in the interfacial regions of polymer nanocomposites
Effect of tetrahydrofuran on poly(methyl methacrylate) and silica in the interfacial regions of polymer nanocomposites
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DOI：
10.1038/s41428-020-0375-0
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发表时间：
2020-06
期刊：
影响因子：
2.8
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
通过差示扫描量热法（DSC）、傅里叶变换红外光谱（FT-IR）和X射线衍射（XRD）分析，研究了四氢呋喃（THF）对聚合物纳米复合材料中聚甲基丙烯酸甲酯（PMMA）/SiO2纳米粒子界面物理性能的影响。在退火的样品中观察到含有大量的trans-gauche构象的PMMA链的无定形结构。从THF悬浮液中浇铸的样品中的无定形结构含有富含trans-transformers的PMMA链。这些无定形结构与不含二氧化硅制备的纯PMMA的结构不同。虽然聚合物链的流动性降低，由于PMMA和二氧化硅纳米粒子之间的相互作用，反式-反式-富PMMA链内的无定形结构受这些相互作用的影响较小。当非晶结构被加热到PMMA的玻璃化转变温度以上时，trans-gauche构象的比例增加。
The effects of tetrahydrofuran (THF) on the physical properties of poly(methyl methacrylate) at (PMMA)/silica nanoparticle interfaces in polymer nanocomposites were investigated via differential scanning calorimetry (DSC), Fourier transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD) analysis. Amorphous structures containing PMMA chains with large numbers of trans-gauche conformers were observed in the annealed samples. The amorphous structures in the samples cast from THF suspensions contained PMMA chains rich in trans–trans conformers. These amorphous structures differed from those of neat PMMA prepared without silica. Although the polymer chain mobility was reduced due to interactions between PMMA and the silica nanoparticles, trans–trans-enriched PMMA chains within the amorphous structures were less affected by these interactions. When the amorphous structures were heated above the glass transition temperature of PMMA, the proportion of trans–gauche conformers increased.