Rheological behavior and fiber spinning of polyacrylonitrile (PAN)/Carbon nanotube (CNT) dispersions at high CNT loading

POLYMER

卷:215

Article

Lu, Mingxuan¹  Liao, Jianshan^1,3  Gulgunje, Prabhakar V.²  Chang, Huibin^2,3  Arias-Monje, Pedro J.²  Ramachandran, Jyotsna²  Breedveld, Victor^1,3  Kumar, Satish² 

[1] Georgia Inst Technol, Sch Chem & Biomol Engn, 311 Ferst Dr NW, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Sch Mat Sci & Engn, 801 Ferst Dr NW,MRDC 1, Atlanta, GA 30332 USA

[3] Georgia Inst Technol, Renewable Bioprod Inst, Atlanta, GA 30332 USA

关键词: Carbon nanotube;    Polymer composites;    Rheological behavior;    Fiber spinning;   

DOI  :  10.1016/j.polymer.2020.123369

来源: Elsevier

【 摘 要 】

Rheological studies play an important role in polymer processing including fiber spinning. In the current work, rheological behavior has been studied for polyacrylonitrile (PAN)/carbon nanotube (CNT) dispersions in dimethyl formamide (DMF), where CNT loading is as high as 15 wt% of the total solids (polymer + CNT). The presence of CNTs increased the elastic-like and shear thinning behavior of the dispersions. The terminal slope of the log G' versus log G '' curve, which was used to characterize the homogeneity of solution or dispersion, is dependent on the CNT concentration but independent of temperature between 0 and 60 degrees C. PAN/CNT-10 (90 wt % PAN +10 wt% CNT) and PAN/CNT-15 were gel spun at different conditions, with small diameter capillary at high shear rate and large diameter capillary at relatively low shear rate. For PAN/CNT-10, fiber spinning with lower molecular weight polymer showed increased continuous jetting time when compared to spinning with higher molecular weight polymer. In addition, the rheological behavior of PAN/cellulose nanocrystal (CNC) dispersion with 20-60 wt% CNC was also compared to that of the PAN/CNT dispersions. PAN/CNC and PAN/CNT share similarities in both rheological behavior and fiber spinning at high filler loading.

【 授权许可】

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