Structural evolution and thermal property of carbon films prepared with polyimide and polyacrylonitrile

Ma, Lianru; Wang, Yanxiang; Niu, Fang-xu; Wang, Yaoyao; Zhuang, Guangshan; Qiu, Yue; Zhang, Renjie; Ma, Qing

doi:10.1088/2053-1591/aae72f

Cited by 5 publications

(2 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another way to induce orientation and graphitization in a graphite film without additives is by using a controlled graphitization temperature and a PI precursor with a controlled structure. ,− …”

Section: Introductionmentioning

confidence: 99%

Structural Effect of Polyimide Precursors on Highly Thermally Conductive Graphite Films

2022

View full text Add to dashboard Cite

In this study, polyimide (PI) with high carbonization yield was used as a precursor to prepare graphite films with high thermal conductivity. The crystallinity, grain size, and thermal conductivity of the graphite films were characterized and found to vary according to the chemical structure of the PI precursor. Aromatic PIs containing ortho-substituted hydroxyl groups in the PI main chain (DHB-BPDA) were synthesized by the polycondensation reaction of 3,3′-dihydroxybenzidine (DHB) and 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA). The DHB-BPDA is converted to a polybenzoxazole (PBO) structure through thermolysis reaction during carbonization. The PBO containing a benzene ring and a heterocycle group can provide a strong main chain and high thermal stability due to its resonant structure. The graphite film prepared from DHB-BPDA exhibited a large grain size (63.727 nm) and a high thermal conductivity of 916 W/(mK).

show abstract

Section: Introductionmentioning

confidence: 99%

Structural Effect of Polyimide Precursors on Highly Thermally Conductive Graphite Films

2022

View full text Add to dashboard Cite

show abstract

“…Pyrolyzed aromatic polyimides such as Kapton ® , Matrimid ® or Torlon ® have been widely explored for gas separation membranes due to their controlled porosity and thermal/chemical stability [14][15][16]. Furthermore, carbon derived from polyimides contains highly oriented and crystalline graphite structure, which is important for EDLCs [17]. Surprisingly, only a limited number of polyimides have been studied as CNF precursors despite their ready electrospinnability [7,12].…”

Section: Introductionmentioning

confidence: 99%

Surface crosslinking of 6FDA-durene nanofibers for porous carbon nanofiber electrodes in electrochemical double layer capacitors

et al. 2020

View full text Add to dashboard Cite

Tailoring the chemical structures of a precursor polymer for carbon nanofibers (CNFs) produced by thermal treatment of electrospun nanofibers was studied to prepare the electrodes for electrochemical double layer capacitors (EDLCs). To improve energy storage performance of CNF electrodes, 6FDA-durene nanofibers were crosslinked by a vapor crosslinking method, and subsequently carbonized. Chemical modification via crosslinking was confirmed by FTIR spectra while the conversion of crosslinked 6FDA-durene into carbon was done by Raman spectroscopy. Electrochemical performance of these CNF electrodes was evaluated by assembling coin cells, and the CNFs derived from crosslinked 6FDA-durene nanofibers showed higher specific capacitances, energy densities and cycling stability than those from non-crosslinked ones. It was also shown that CNFs prepared using 1 min crosslinking exhibit the highest energy storage performances, a specific capacitance of 301 F g−1 (at 10 mV s−1), and the maximum energy density of 11.1 Wh kg−1 (at 0.5 A g−1) and power density of 1.8 kW kg−1 (at 6 A g−1). Surface area and porosity of CNFs, which is critical for the performance of EDLC electrodes, were studied by nitrogen adsorption/desorption measurements, and it was clearly seen that surface crosslinking of precursor polymers improved surface properties of the resultant CNFs.

show abstract

Fabrication and Thermal Dissipation Properties of Carbon Nanofibers Derived from Electrospun Poly(Amic Acid) Carboxylate Salt Nanofibers

Chiu

et al. 2019

Macro Materials & Eng

View full text Add to dashboard Cite

Polyimides (PIs) possess excellent mechanical properties, thermal stability, and chemical resistance and can be converted to carbon materials by thermal carbonization. The preparation of carbon nanomaterials by carbonizing PI‐based nanomaterials, however, has been less studied. In this work, the fabrication of PI nanofibers is investigated using electrospinning and their transformation to carbon nanofibers. Poly(amic acid) carboxylate salts (PAASs) solutions are first electrospun to form PAAS nanofibers. After the imidization and carbonization processes, PI and carbon nanofibers can then be obtained, respectively. The Raman spectra reveal that the carbon nanofibers are partially graphitized by the carbonization process. The diameters of the PI nanofibers are observed to be smaller than those of the PAAS nanofibers because of the formation of the more densely packed structures after the imidization processes; the diameters of the carbon nanofibers remain similar to those of the PI nanofibers after the carbonization process. The thermal dissipation behaviors of the PI and carbon nanofibers are also examined. The infrared images indicate that the transfer rates of thermal energy for the carbon nanofibers are higher than those for the PI nanofibers, due to the better thermal conductivity of carbon caused by the covalent sp2 bonding between carbon atoms.

show abstract

Structural evolution and thermal property of carbon films prepared with polyimide and polyacrylonitrile

Cited by 5 publications

References 36 publications

Structural Effect of Polyimide Precursors on Highly Thermally Conductive Graphite Films

Structural Effect of Polyimide Precursors on Highly Thermally Conductive Graphite Films

Surface crosslinking of 6FDA-durene nanofibers for porous carbon nanofiber electrodes in electrochemical double layer capacitors

Fabrication and Thermal Dissipation Properties of Carbon Nanofibers Derived from Electrospun Poly(Amic Acid) Carboxylate Salt Nanofibers

Contact Info

Product

Resources

About