Ultra-small SiO2 nanospheres self-pollinated on flower-like MoS2 for simultaneously reinforcing mechanical, thermal and flame-retardant properties of polyacrylonitrile fiber
Ultra-small SiO2 nanospheres self-pollinated on flower-like MoS2 for simultaneously reinforcing mechanical, thermal and flame-retardant properties of polyacrylonitrile fiber
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DOI：
10.1016/j.compositesb.2019.107037
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Hongyun Peng;Dong Wang;Min Li;Liping Zhang;Mingming Liu;Shaohai Fu
中科院分区：
文献类型：
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作者：
Hongyun Peng;Dong Wang;Min Li;Liping Zhang;Mingming Liu;Shaohai Fu
为了赋予聚丙烯腈（PAN）纤维优异的力学、耐热和阻燃性能，通过设计缺陷丰富的花状MoS 2与巯基功能化SiO2纳米球的配体共轭，合成了三维分级结构的f-MoS 2-SiO2杂化物，并将其引入聚丙烯腈纺丝液中制备PAN复合纤维。当f-MoS 2-SiO2的质量分数为2%时，纤维的拉伸强度和断裂伸长率分别比原纤维提高了42%和35%。f-MoS 2-SiO2/PAN纤维的5%质量损失温度（T-5%）提高了22 °C，意味着热稳定性提高。此外，f-MoS 2-SiO2/PAN复合纤维表现出良好的阻燃性，与纯PAN相比，峰值热释放速率和总热释放分别降低32.8%和26.7%。气相和凝聚相分析表明，f-MoS 2-SiO2杂化材料的引入抑制了PAN纤维热解挥发物HCN和羰基化合物的逸出，促进了PAN纤维表面碳化，保护了基体。本论文旨在开发二硫化钼基杂化材料在聚合物复合材料性能增强方面的应用。
Aiming to imparting polyacrylonitrile (PAN) fiber with excellent mechanical, thermal and flame-retardant properties, the 3D hierarchical f-MoS2-SiO2hybrids were synthesized by designing the ligand conjugation of defect-rich flower-like MoS2with thiol-functionalized SiO2nanospheres, which were introduced into polyacrylonitrile spinning solution to fabricate PAN composite fibers. With the incorporation of 2 wt% f-MoS2-SiO2, the tensile strength and breakage elongation of f-MoS2-SiO2/PAN fiber were improved by 42% and 35% compared with pristine PAN fiber, respectively. The 5% mass loss temperature (T-5%) of f-MoS2-SiO2/PAN fiber was improved by 22 °C, implying the improved thermal stability. Moreover, f-MoS2-SiO2/PAN composite fiber exhibited good flame retardancy with 32.8% and 26.7% reduction in peak heat release rate and total heat release in contrast to pure PAN, respectively. The analysis on gaseous and condensed phase demonstrated the incorporation of f-MoS2-SiO2hybrids retarded the effusion of pyrolytic volatiles including HCN and carbonyl compounds, and facilitated carbonization on the surface of PAN fibers to protect underlying matrix. The paper will develop MoS2-based hybrids in the application of properties reinforcement of polymer composites.