<P><B>Abstract</B></P> <P> <I>Meta</I>-aramid exhibits excellent chemical stability and mechanical strength owing to its rigid crystal structure. However, the crystal structure is destroyed when <I>meta...
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https://www.riss.kr/link?id=A107452396
2018
-
SCI,SCIE,SCOPUS
학술저널
46-53(8쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P><B>Abstract</B></P> <P> <I>Meta</I>-aramid exhibits excellent chemical stability and mechanical strength owing to its rigid crystal structure. However, the crystal structure is destroyed when <I>meta...
<P><B>Abstract</B></P> <P> <I>Meta</I>-aramid exhibits excellent chemical stability and mechanical strength owing to its rigid crystal structure. However, the crystal structure is destroyed when <I>meta</I>-aramid nanofibers (mANFs) are fabricated by electrospinning, which results in nanofibers with poor performance characteristics. Here, we present a facile solvent-assisted heat treatment for the efficient crystallization of mANFs. The optimal volume ratio of the co-solvent solution was determined to be 6:5:100 (DMAc:ethylene glycol:water), and the optimal crystallization temperature 120 °C. The crystallinity of the mANFs obtained under these optimized conditions (mANF-6-120) is higher than the crystallinity of mANFs heat-treated at 300 °C (mANF-HT). As a result, mANF-6-120 exhibits superior chemical stability and mechanical strength compared to mANF-HT. After immersion in DMAc for 48 h, the weight of mANF-6-120 is reduced to 28% of its original weight, whereas the relative remaining weight of mANF-HT is less than 8%. The value of Young’s modulus of mANF-6-120 is 1.7 times higher than that of mANF-HT. The crystallization process developed in this study requires less energy and is less expensive than the conventional high-temperature heat treatment process. The <I>meta</I>-aramid nanofiber mat obtained using the proposed process shows great promise for application to water purification and the treatment of polluted air.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We fabricated <I>meta</I>-aramid nanofibers via electrospinning. </LI> <LI> The as-synthesized <I>meta</I>-aramid nanofibers were treated by solvent-assisted thermal treatment. </LI> <LI> The <I>meta</I>-aramid nanofibers were effectively crystallized by the solvent-assisted thermal treatment at 120 °C. </LI> <LI> The highly crystallized nanofibers exhibited enhanced chemical stability and mechanical strength. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>