【摘要】 用DSC研究了碳纤维 (CF)表面阴离子接枝尼龙 6 (PA6 )后复合材料CF/PA6的等温结晶及熔融行为。结果表明 ,未接枝的CF对PA6结晶起异相成核作用 ,使PA6的结晶度增大。接枝改性CF增强了两相界面间的相互作用 ,促进成核 ,但使PA6大分子链的运动受到约束 ,使PA6的结晶度减小。接枝导致CF/PA6复合材料界面化学性质相似 ,因此 ,具有较高的诱发横穿晶能力。等温熔融结果表明 ,较低的结晶温度下 ,未接枝CF表面的诱导作用有利于基体PA6形成α晶型 ,接枝改性CF使PA6主要形成亚稳定的γ 晶型。较高温度下 ,未改性CF使PA6主要形成γ晶型 ;接枝改性CF使基体倾向于形成热稳定性较低的γ 型结晶更多还原

【Abstract】 The isothermal crystallization behavior and melting characteristics of CF/PA6 composites have been studied by DSC. The results show that the ungrafted carbon fiber in CF/PA6 composites played the role of (nucleating) agent, which enhances the crystallization rate and increase the apparent crystallization degree of PA6. The grafting CF improved the interface adhesion between PA6 and CF, which prohibits the movement of PA6 molecule thus leading to reduce the crystallization rate and the apparent crystallization degree of PA6. The interphase chemistry property of grafting CF/PA6 composites was similar due to grafting, thus the inducing transcrystallization ability of grafting CF was improved. At lower (crystallization) temperature, ungrafted CF (induces) PA6 matrix to form α crystal and inhibits the form of γ crystal, grafting CF enhances the interface (interaction) between CF and PA6, thus prohibits PA6 from forming stable crystal and produces metastable γ~* crystal.At higher crystallization temperature, the induction effect of ungrafted CF declined, and PA6 matrix intended to form γ crystal as the pure PA6, but grafting CF urges PA6 to form metastable γ~* crystal as it did at lower crystallization temperature.更多还原