TY - JOUR
T1 - Dramatic enhancements in toughness of polyimide nanocomposite via long-CNT-induced long-range creep
AU - Jia, Xilai
AU - Zhang, Qiang
AU - Zhao, Meng Qiang
AU - Xu, Guang Hui
AU - Huang, Jia Qi
AU - Qian, Weizhong
AU - Lu, Yunfeng
AU - Wei, Fei
PY - 2012/4/14
Y1 - 2012/4/14
N2 - Super tough carbon nanotube (CNT) reinforced nanocomposites require both the unique interaction and effective stress transfer between CNTs and polymer chains. When CNT reinforced nanocomposites are stretched, the crack interfaces are usually bridged by CNTs, and energy can be absorbed during deformation before fracture and bring high toughness. However, developing super-tough CNT/polymer nanocomposites which can withstand high matrix deformation yet exploit the superior strength of CNTs is still a great challenge. In this contribution, an ultra-tough CNT/polyimide (PI) nanocomposite was fabricated by a facile in situ polymerization. Super-long vertically aligned CNTs were dispersed into N,N-dimethylacetamide, which is the feedstock for in situ PI polymerization. A long-CNT-induced three-dimensional, continuous, and heterogeneous network is formed to toughen the nanocomposites. By incorporating 0.27 wt% CNTs into a PI matrix, the tensile strength and elongation at break of the nanocomposites reached 156.4 MPa and 140%, respectively, which are 90% and 250% increased compared with the values of pristine PI. Thus, the toughness of the nanocomposites improved 470% and approached 127.4 J g -1, well exceeding state-of-the-art tough materials. The reinforcement mechanism reveals that robust tapered fibrils are formed around high-aspect-ratio CNTs to facilitate energy dissipation and enhance the energy absorbing capability. The length of CNTs and the interfacial bonding are important to initiate long-range creep and form robust heterogeneous tapered fibrils to toughen the nanocomposites. The CNT/PI composite film with high toughness, much improved electrical conductivity, as well as high thermal stability, and transparency, broadened their advanced applications in aerospace, aviation, buildings, bulletproof vests, and so on.
AB - Super tough carbon nanotube (CNT) reinforced nanocomposites require both the unique interaction and effective stress transfer between CNTs and polymer chains. When CNT reinforced nanocomposites are stretched, the crack interfaces are usually bridged by CNTs, and energy can be absorbed during deformation before fracture and bring high toughness. However, developing super-tough CNT/polymer nanocomposites which can withstand high matrix deformation yet exploit the superior strength of CNTs is still a great challenge. In this contribution, an ultra-tough CNT/polyimide (PI) nanocomposite was fabricated by a facile in situ polymerization. Super-long vertically aligned CNTs were dispersed into N,N-dimethylacetamide, which is the feedstock for in situ PI polymerization. A long-CNT-induced three-dimensional, continuous, and heterogeneous network is formed to toughen the nanocomposites. By incorporating 0.27 wt% CNTs into a PI matrix, the tensile strength and elongation at break of the nanocomposites reached 156.4 MPa and 140%, respectively, which are 90% and 250% increased compared with the values of pristine PI. Thus, the toughness of the nanocomposites improved 470% and approached 127.4 J g -1, well exceeding state-of-the-art tough materials. The reinforcement mechanism reveals that robust tapered fibrils are formed around high-aspect-ratio CNTs to facilitate energy dissipation and enhance the energy absorbing capability. The length of CNTs and the interfacial bonding are important to initiate long-range creep and form robust heterogeneous tapered fibrils to toughen the nanocomposites. The CNT/PI composite film with high toughness, much improved electrical conductivity, as well as high thermal stability, and transparency, broadened their advanced applications in aerospace, aviation, buildings, bulletproof vests, and so on.
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U2 - 10.1039/c2jm15359a
DO - 10.1039/c2jm15359a
M3 - Article
AN - SCOPUS:84863356959
SN - 0959-9428
VL - 22
SP - 7050
EP - 7056
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
IS - 14
ER -