The thermal behavior of acrylonitrile polymers. I. On the decomposition of polyacrylonitrile between 250 and 325°C.

Thompson, Edward V.

doi:10.1002/pol.1966.110040511

Cited by 50 publications

(10 citation statements)

References 10 publications

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“…[53] (2) the chain end groups; [54] (3) random initiation by hydrogen atoms a to the nitrile; [55] (4) transformation of a nitrile to an azomethine; [56];(5) the presence of a ketonitrile formed by hydrolysis during polymerization; [28] and (6) hydrolysis of nitriles to acids during polymerization [57]. In addition, due to their reaction, cyclization reactions can proceed in either an inert atmosphere or in the presence of oxygen.…”

Section: Cyclization Reactionmentioning

confidence: 99%

A review of heat treatment on polyacrylonitrile fiber

Rahaman

Ismail

Mustafa

2007

Polymer Degradation and Stability

1,249

856

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Section: Cyclization Reactionmentioning

confidence: 99%

A review of heat treatment on polyacrylonitrile fiber

Rahaman

Ismail

Mustafa

2007

Polymer Degradation and Stability

1,249

856

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“…The exothermic DTA peak centered around 570 K [ Fig. 1(b)] is produced by PAN decomposition [12]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Pyrolysis temperature and time dependence of electrical conductivity evolution for electrostatically generated carbon nanofibers

Wang

Santiago-Avilés

Furlan

et al. 2003

IEEE Trans. Nanotechnology

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Carbon nanofibers were produced from polyacrylonitrile/N, N-Dimethyl Formamide (PAN/DMF) precursor solution using electrospinning and vacuum pyrolysis at temperatures from 773-1273 K for 0.5, 2, and 5 h, respectively. Their conductance was determined from I -V curves. The length and cross-section area of the nanofibers were evaluated using optical microscope and scanning probe microscopes, respectively, and were used for their electrical conductivity calculation. It was found that the conductivity increases sharply with the pyrolysis temperature, and increases considerably with pyrolysis time at the lower pyrolysis temperatures of 873, 973, and 1073 K, but varies, less obviously, with pyrolysis time at the higher pyrolysis temperatures of 1173 and 1273 K. This dependence was attributed to the thermally activated transformation of disordered to graphitic carbons. KeywordsCarbon, conductivity measurement, electrostatic processes, nanotechnology This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Pennsylvania's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it. Abstract-Carbon nanofibers were produced from polyacrylonitrile/N, N-Dimethyl Formamide (PAN/DMF) precursor solution using electrospinning and vacuum pyrolysis at temperatures from 773-1273 K for 0.5, 2, and 5 h, respectively. Their conductance was determined from -curves. The length and cross-section area of the nanofibers were evaluated using optical microscope and scanning probe microscopes, respectively, and were used for their electrical conductivity calculation. It was found that the conductivity increases sharply with the pyrolysis temperature, and increases considerably with pyrolysis time at the lower pyrolysis temperatures of 873, 973, and 1073 K, but varies, less obviously, with pyrolysis time at the higher pyrolysis temperatures of 1173 and 1273 K. This dependence was attributed to the thermally activated transformation of disordered to graphitic carbons.

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“…19 The exotherm peak temperature depends on the molecular weight of PAN. 20 The PAN prepared with the gum having a higher molecular weight decomposes at higher temperature. The char residue is due more to the higher molecular weight and enhanced microregularity of the chain.…”

Section: Thermal Behaviormentioning

confidence: 99%

Effect of plant gums on thermal polymerization of acrylonitrile

Jana

Maiti

Sengupta

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:The effect of some plant gums on the polymerization of acrylonitrile (AN) using ceric ammonium nitrate (CAN) as an initiator in the presence of air (containing 21% oxygen) was studied. The induction period and percent conversion were determined. The induction period in the presence of gum was comparatively lower than that under a N 2 atmosphere. The rate of polymerization has a 1.5-power dependence on the monomer concentration and the rate is sufficiently high at moderate temperature. The rate also increased with an increasing initiator concentration and reaches a maximum value of 93% at 0.72 ϫ 10 Ϫ2 mol L Ϫ1 of CAN. The activation energy was found to be 6.4 kcal mol Ϫ1 . Both the molecular weight and density of the polyacrylonitrile (PAN) prepared in the presence of gum were higher than those of PAN prepared in the absence of the gum. The PAN produced in the presence of the gum was thermostable than that prepared in its absence.

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The thermal behavior of acrylonitrile polymers. I. On the decomposition of polyacrylonitrile between 250 and 325°C.

Cited by 50 publications

References 10 publications

A review of heat treatment on polyacrylonitrile fiber

A review of heat treatment on polyacrylonitrile fiber

Pyrolysis temperature and time dependence of electrical conductivity evolution for electrostatically generated carbon nanofibers

Effect of plant gums on thermal polymerization of acrylonitrile

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