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首页> 美国卫生研究院文献>Polymers >Rheology Non-Isothermal Crystallization Behavior Mechanical and Thermal Properties of PMMA-Modified Carbon Fiber-Reinforced Poly(Ethylene Terephthalate) Composites
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Rheology Non-Isothermal Crystallization Behavior Mechanical and Thermal Properties of PMMA-Modified Carbon Fiber-Reinforced Poly(Ethylene Terephthalate) Composites

机译：PMMA改性碳纤维增强聚对苯二甲酸乙二酯复合材料的流变非等温结晶行为力学和热性能

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摘要

Poly(ethylene terephthalate) (PET) composites containing carbon fiber (CF) or polymethyl methacrylate (PMMA)-grafted carbon fiber (PMMA-g-CF) were prepared by melt compounding. The rheology, non-isothermal crystallization behavior, and mechanical and thermal properties of pure PET, PET/CF and PET/PMMA-g-CF composites were investigated. The results show that the addition of CF or PMMA-g-CF significantly increases the storage modulus (G′), loss modulus (G″), and complex viscosity (η*) of the composites at low frequency. The Cole-Cole plots confirm that the surface modification of CF leads to a better interaction between the CF and PET, and then decreases the heterogeneity of the polymeric systems, which is confirmed by the SEM observation on the tensile fracture surface of the composites. Non-isothermal crystallization analysis shows that the CF or PMMA-g-CF could serve as nucleation agent to accelerate the crystallization rate of the composites, and the effect of PMMA-g-CF is stronger than that of CF. The result is further confirmed by the analysis of the crystallization activation energy for all composites calculated by the Flynn-Wall-Ozawa method. Moreover, the tensile and impact strength and the thermal stability of the composites are improved by CF, while the incorporation of PMMA-g-CF further enhances the tensile and impact strength and thermal stability.
机译：通过熔融混合制备了包含碳纤维（CF）或聚甲基丙烯酸甲酯（PMMA）接枝的碳纤维（PMMA-g-CF）的聚对苯二甲酸乙二酯（PET）复合材料。研究了纯PET，PET / CF和PET / PMMA-g-CF复合材料的流变学，非等温结晶行为以及机械和热性能。结果表明，CF或PMMA-g-CF的添加显着提高了复合材料在低频下的储能模量（G'），损耗模量（G''）和复数粘度（η*）。 Cole-Cole图证实，CF的表面改性导致CF和PET之间更好的相互作用，然后降低了聚合物体系的异质性，这是通过在复合材料的拉伸断裂表面上进行SEM观察证实的。非等温结晶分析表明，CF或PMMA-g-CF可以作为成核剂来加速复合材料的结晶速率，PMMA-g-CF的作用要强于CF。通过用Flynn-Wall-Ozawa方法计算的所有复合材料的结晶活化能的分析进一步证实了该结果。此外，CF提高了复合材料的拉伸强度和冲击强度以及热稳定性，而PMMA-g-CF的加入进一步提高了拉伸强度和冲击强度以及热稳定性。

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