Studies of reaction mechanisms during stabilization of electrospun polyacrylonitrile carbon nanofibers

Barua, Bipul; Saha, Mrinal C.

doi:10.1002/pen.24708

Title: Studies of reaction mechanisms during stabilization of electrospun polyacrylonitrile carbon nanofibers

Journal Article · Fri Sep 22 00:00:00 EDT 2017 · Polymer Engineering and Science

DOI:https://doi.org/10.1002/pen.24708· OSTI ID:1489823

Barua, Bipul ^[1];

^[2]

Argonne National Lab. (ANL), Lemont, IL (United States)
Univ. of Oklahoma, Norman, OK (United States)

Various reaction mechanisms such as cyclization, oxidation, dehydrogenation, and crosslinking are studied during stabilization of electrospun polyacrylonitrile nanofibers using different in situ techniques such as differential scanning calorimetry (DSC), shrinkage measurement, and dynamic mechanical analysis (DMA). DSC results show that oxidation preferentially occurs in cyclized structure. It is also found that the cyclization reaction has the highest activation energy followed by oxidation/dehydrogenation and crosslinking reactions. In situ shrinkage measurement and DMA data are used to study the extent of cyclization and cross-linking reactions, respectively, in air. Comparing the in situ shrinkage measurement with DSC data, it is found that cyclization reaction in air progresses in two different mechanisms such as radical cyclization, which depends only on the temperature and ionic cyclization, which is limited by the rate of oxygen diffusion. In conclusion, it is found that complete cyclization time occurs at about 189 min for isothermal heat treatment at 260 °C with 5 °C/min ramp, while cross-linking reaction becomes dominant at 132 min.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: University of Oklahoma; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1489823

Journal Information:: Polymer Engineering and Science, Vol. 58, Issue 8; ISSN 0032-3888

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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