The interfacial phase structures of nylon 6 with alumina nanoparticles were investigated by X-ray diffraction measurements, infrared spectroscopy, and differential scanning calorimetry for composites with high weight fractions (30–70%) of alumina. The melting and crystallization temperatures were decreased by the addition of alumina nanoparticles. Changes in the infrared spectra of the composites suggested that the alumina nanoparticles strengthened the hydrogen bonds of nylon 6 at their interfaces. The composites were dispersed in formic acid, which is a good solvent of nylon 6, and the precipitates were collected by centrifugation. The infrared spectrum and the results of thermal gravimetric analysis suggested the presence of nylon 6 in the precipitate even after washing with formic acid. These results indicate the existence of an interfacial phase where nylon 6 is strongly adsorbed onto alumina nanoparticles, and its crystallization behavior and structure formed by the hydrogen bonds were affected by the interfacial interaction. Composites of nylon 6 and large amounts of alumina nanoparticles were prepared to investigate nylon 6 at its interface with alumina. DSC curves obtained by heating and cooling the slowly cooled samples indicate decreases in melting and crystallization temperatures. The melting enthalpy and XRD patterns show a decrease in the degree of crystallization with the addition of alumina. The IR spectra suggest that hydrogen bonds were enhanced at the interface.

中文翻译：

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强吸附在氧化铝颗粒上的尼龙 6 的界面相

尼龙 6 与氧化铝纳米粒子的界面相结构通过 X 射线衍射测量、红外光谱和差示扫描量热法对具有高重量分数 (30-70%) 氧化铝的复合材料进行了研究。通过添加氧化铝纳米颗粒降低了熔化和结晶温度。复合材料红外光谱的变化表明氧化铝纳米颗粒加强了尼龙 6 在其界面处的氢键。将复合材料分散在甲酸中，甲酸是尼龙 6 的良好溶剂，通过离心收集沉淀物。红外光谱和热重分析结果表明，即使在用甲酸洗涤后，沉淀物中仍存在尼龙 6。这些结果表明存在界面相，其中尼龙 6 强烈吸附在氧化铝纳米粒子上，其结晶行为和由氢键形成的结构受界面相互作用的影响。制备了尼龙 6 和大量氧化铝纳米粒子的复合材料，以研究尼龙 6 与氧化铝的界面。通过加热和冷却缓慢冷却的样品获得的 DSC 曲线表明熔化和结晶温度降低。熔融焓和 XRD 谱图表明，随着氧化铝的加入，结晶度降低。红外光谱表明界面处的氢键增强。其结晶行为和由氢键形成的结构受界面相互作用的影响。制备了尼龙 6 和大量氧化铝纳米粒子的复合材料，以研究尼龙 6 与氧化铝的界面。通过加热和冷却缓慢冷却的样品获得的 DSC 曲线表明熔化和结晶温度降低。熔融焓和 XRD 谱图表明，随着氧化铝的加入，结晶度降低。红外光谱表明界面处的氢键增强。其结晶行为和由氢键形成的结构受界面相互作用的影响。制备了尼龙 6 和大量氧化铝纳米粒子的复合材料，以研究尼龙 6 与氧化铝的界面。通过加热和冷却缓慢冷却的样品获得的 DSC 曲线表明熔化和结晶温度降低。熔融焓和 XRD 谱图表明，随着氧化铝的加入，结晶度降低。红外光谱表明界面处的氢键增强。通过加热和冷却缓慢冷却的样品获得的 DSC 曲线表明熔化和结晶温度降低。熔融焓和 XRD 谱图表明，随着氧化铝的加入，结晶度降低。红外光谱表明界面处的氢键增强。通过加热和冷却缓慢冷却的样品获得的 DSC 曲线表明熔化和结晶温度降低。熔融焓和 XRD 谱图表明，随着氧化铝的加入，结晶度降低。红外光谱表明界面处的氢键增强。