AbstractThe interface structures of isotactic poly(methyl methacrylate) (it-PMMA)/alumina nanoparticle (Al2O3; ~40 nm) mixtures from tetrahydrofuran (THF) solutions were investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and differential scanning calorimetry (DSC). The mixtures of it-PMMA can form two amorphous phases with different crystallinities depending on casting conditions from THF. These structures are metastable and have different activation energies for crystal nucleus formation. The polymer interface on Al2O3 particles changes into a crystallizable amorphous phase with a trans-gauche-rich chain conformation.The interphase structure of isotactic poly(methyl methacrylate) (it-PMMA)/aluminananoparticle mixtures obtained from tetrahydrofuran (THF) solution was discussed. The it-PMMA in the mixtures forms two amorphous phases (crystallizable and incrystallizable phases) depending on casting conditions from THF. The polymer interphase on Al2O3 particles changes into a crystallizable structure with a trans-gauche rich conformation and amorphous. The interphase shows a lower Tg than the melt-cast one and is easy to crystallize at low temperature. The novel structure was formed by the conformation freezing of the polymer at Al2O3 surface.

中文翻译：

---

等规聚（甲基丙烯酸甲酯）/氧化铝纳米颗粒混合物中亚稳态界面的形成

摘要通过 X 射线衍射 (XRD)、傅里叶变换红外 (FT-IR) 研究了四氢呋喃 (THF) 溶液中等规聚甲基丙烯酸甲酯 (it-PMMA)/氧化铝纳米颗粒 (Al2O3;~40 nm) 混合物的界面结构。 ) 光谱和差示扫描量热法 (DSC)。根据来自 THF 的铸造条件，it-PMMA 的混合物可以形成具有不同结晶度的两种非晶相。这些结构是亚稳态的，并且具有不同的晶核形成活化能。Al2O3 颗粒上的聚合物界面转变为具有反式富链构象的可结晶非晶相。讨论了从四氢呋喃 (THF) 溶液中获得的等规聚甲基丙烯酸甲酯 (it-PMMA)/铝纳米颗粒混合物的界面结构。混合物中的 it-PMMA 根据铸造条件从 THF 形成两个非晶相（可结晶和不可结晶相）。Al2O3 颗粒上的聚合物界面转变为可结晶结构，具有丰富的反式构象和无定形。中间相显示出比熔铸相低的 Tg，并且在低温下容易结晶。这种新型结构是通过聚合物在 Al2O3 表面的构象冻结形成的。