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首页> 外文期刊>Journal of industrial and engineering chemistry >Preparation and characterization of polyacrylonitrile-based carbon fibers produced by electron beam irradiation pretreatment
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Preparation and characterization of polyacrylonitrile-based carbon fibers produced by electron beam irradiation pretreatment

机译：电子束辐照预处理制备聚丙烯腈基碳纤维及其表征

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摘要

This study evaluated the feasibility of polyacrylonitrile (PAN) fibers stabilized by thermal treatment after electron beam irradiation (EBI) in the production of carbon fibers. The effects of EBI and thermal treatments on the PAN precursor were verified by FT-IR, differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning electron microscopy (SEM). FT-IR spectra confirmed that the intensities of the C=N stretching vibration at 2244 cm~(-1) significantly decreased as the thermal treatment temperature increase from 200 °C to 250 °C and the holding time from 20 min to 40 min after EBI process. This decrease was caused by the cyclization of nitrile groups upon stabilization by the EBI and thermal treatments. The thermal properties were characterized by DSC, which confirmed that the EBI affected the quantity of the released heat as well as the position of exothermic equilibrium over a wide range of low temperatures. The majority of the exothermic peaks disappeared after thermal treatment. The stabilization index (SI) values for the PAN fibers that were exposed to EBI and thermal treatment after EBI were evaluated by XRD. The SI value of the PAN fibers that were treated at 250 °C for 40 min after EBI was 99.21%. Additionally, the tensile strength of carbon fibers that were produced from PAN attained about 2.3 GPa, the cross-section exhibited a clear and brittle morphology.
机译：这项研究评估了碳纤维生产中通过电子束辐照（EBI）后的热处理稳定化的聚丙烯腈（PAN）纤维的可行性。通过FT-IR，差示扫描量热法（DSC），X射线衍射（XRD）和扫描电子显微镜（SEM）验证了EBI和热处理对PAN前体的影响。 FT-IR光谱证实，随着热处理温度从200°C升高至250°C，保持时间从20 min升高至40 min，在2244 cm〜（-1）处C = N拉伸振动的强度显着降低。 EBI流程。这种减少是由于通过EBI和热处理稳定后腈基的环化作用引起的。 DSC表征了热性能，这证实了EBI在广泛的低温范围内影响释放的热量以及放热平衡的位置。热处理后，大部分放热峰消失了。通过XRD评估暴露于EBI和EBI后热处理的PAN纤维的稳定指数（SI）值。 EBI后在250°C处理40分钟的PAN纤维的SI值为99.21％。另外，由PAN生产的碳纤维的拉伸强度达到约2.3GPa，横截面显示出清晰而脆的形态。

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