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    王伟, 丁剑峰, 夏浙安, 李欣欣. 扩链改性回收尼龙6/碳纤维复合材料的结构与性能[J]. 华东理工大学学报(自然科学版), 2020, 46(5): 613-620. DOI: 10.14135/j.cnki.1006-3080.20190512002
    引用本文: 王伟, 丁剑峰, 夏浙安, 李欣欣. 扩链改性回收尼龙6/碳纤维复合材料的结构与性能[J]. 华东理工大学学报(自然科学版), 2020, 46(5): 613-620. DOI: 10.14135/j.cnki.1006-3080.20190512002
    WANG Wei, DING Jianfeng, XIA Zhean, LI Xinxin. Structure and Properties of Recycled Polyamide 6/Carbon Fiber Composites Modified by Chain Extension[J]. Journal of East China University of Science and Technology, 2020, 46(5): 613-620. DOI: 10.14135/j.cnki.1006-3080.20190512002
    Citation: WANG Wei, DING Jianfeng, XIA Zhean, LI Xinxin. Structure and Properties of Recycled Polyamide 6/Carbon Fiber Composites Modified by Chain Extension[J]. Journal of East China University of Science and Technology, 2020, 46(5): 613-620. DOI: 10.14135/j.cnki.1006-3080.20190512002

    扩链改性回收尼龙6/碳纤维复合材料的结构与性能

    Structure and Properties of Recycled Polyamide 6/Carbon Fiber Composites Modified by Chain Extension

    • 摘要: 以苯乙烯-马来酸酐共聚物(SMA-700)为扩链剂,通过双螺杆挤出机制备了扩链剂改性回收尼龙6(r-PA6)/碳纤维(质量分数为10%,CF10)复合材料。通过流变性能、力学性能、断面形貌分析(SEM)、差示扫描量热分析(DSC)、X-射线多晶衍射分析(XRD)等手段对r-PA6/CF10复合材料的结构和性能进行了表征。结果表明:SMA-700对r-PA6/CF10具有显著的扩链作用,能够明显改善材料的加工性能。随着SMA-700添加量(质量分数,余同)的增加,r-PA6/CF10的熔体质量流率逐渐减小,表观黏度逐渐增大,熔体假塑性增强。当SMA-700的添加量为1%时,SMA-700的成核作用能够提高r-PA6的结晶速率和结晶度,r-PA6/CF10的拉伸强度也达到最大值(125.4 MPa);但当SMA-700过量添加时,r-PA6的结晶速率和结晶度下降,α晶型的完善程度也会降低。

       

      Abstract: A chain extender, styrene-maleic anhydride copolymer SMA-700, was mixed with recycled polyamide 6/carbon fiber composites (r-PA6/CF10) with a twin-screw extruder. The rheological properties, mechanical properties, morphology, crystalline structure, non-isothermal crystallization and subsequent melting behaviors of the resulting r-PA6/CF10 composites were investigated. The results show that SMA-700 has a remarkable chain extension effect on r-PA6/CF10 composites, and can significantly improve the processing performance of r-PA6/CF10. With the increase of mass fraction of SMA-700, the melt mass flow rate of r-PA6/CF10 decreases gradually. Meanwhile, the apparent viscosity and melt pseudo-plasticity of r-PA6/CF10 will increase with the increase of mass fraction of SMA-700. Mechanical tests show that incorporation of chain extender can simultaneously improve the tensile strength and flexural strength of r-PA6/CF10 composites. SMA-700 mass fractions of 1% and 2% maximizes the tensile strength (125.4 MPa) and flexural strength (182.3 MPa) of the r-PA6/CF10 composites, respectively. The impact strength decreases with increased mass fraction of SMA-700. Scanning electron microscopy (SEM) used suggests that there is no phase separation between SMA-700 and r-PA6 matrix, implying a good compatibility between SMA-700 and r-PA6. Non-isothermal crystallization and subsequent melting behaviors characterized by differential scanning calorimetry (DSC) show that when the mass fraction of SMA-700 is 1%, the nucleation effect of SMA-700 may increase the crystallization rate and crystallinity of the r-PA6 matrix. However, with an excessive amount of SMA-700, both the crystallization rate and crystallinity of r-PA6 drop, and the perfection degree of α crystal form of r-PA6 decreases simultaneously.

       

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