Semibatch RAFT copolymerization of acrylonitrile and N-isopropylacrylamide: Effect of comonomer distribution on cyclization and thermal stability

Moskowitz, Jeremy D.; Wiggins, Jeffrey S.

doi:10.1016/j.polymer.2015.12.035

Cited by 36 publications

(18 citation statements)

References 34 publications

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“…Furthermore, these studies were partly conducted with powdery precursors or bulk precursor samples instead of fibrous ones. Because of different mass and heat transport phenomena, the results cannot be directly transferred to a continuous conversion of fibres . Additionally, process investigations have been performed partly for batch and partly for continuous processes .…”

Section: Process‐structure‐relations and Their Technical Potentialsmentioning

confidence: 99%

Influence of processing parameters on the properties of carbon fibres – an overview

Jäger

Cherif

Kirsten

et al. 2016

Materialwissenschaft Werkst

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Several studies have shown the importance of carbon fibres (CF) for different high technology markets. In recent years, different fibre types with improved properties have been developed for those markets. Polyacrylonitrile (PAN) copolymers are the basic raw material (precursor) for these fibres in the predominant case. Improvements of the mechanical fibre properties have mainly been achieved by defect reduction during the manufacturing process. Thus, commercial carbon fibres with tensile strengths up to approx. 7000 MPa are currently available. It can be shown that the strengths can be further increased (in the direction of graphene properties) when the relationship between process conditions and defects due to manufacturing of the fibres is better understood. In this context, novel processes like electron beam crosslinking or UV‐activation have proven to be very promising. The article gives an overview about the current situation in the field of carbon fibres development and particularly shows recent shortcomings with respect to novel applications.

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Section: Process‐structure‐relations and Their Technical Potentialsmentioning

confidence: 99%

Influence of processing parameters on the properties of carbon fibres – an overview

Jäger

Cherif

Kirsten

et al. 2016

Materialwissenschaft Werkst

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“…The thermal behavior of PAN polymers have been investigated intensively in the last few decades [7][8][9][10][11][12][13][14][15]. However, because the thermal behavior depends closely on the nature and M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 content of comonomers as well as the polymerization techniques of PAN polymers [5,14,[16][17][18][19][20], there is still a lack of clarity about the thermo-chemical reactions hidden in the rear. At least three main issues remain to be studied.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

“…32 scans were acquired at a resolution of 4 cm −1 . Thin films of PAN polymers were prepared by using a solution casting method as reported in the literature [19].…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Simultaneous DSC/TG analysis on the thermal behavior of PAN polymers prepared by aqueous free-radical polymerization

Ouyang

Wang

et al. 2016

Polymer Degradation and Stability

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“…The host polymer was a PANb copolymer containing N ‐isopropylacrylamide (NIPAM) synthesized through reversible addition–fragmentation chain transfer (RAFT) copolymerization. NIPAM is advantageous in facilitating the ring‐closing crystallization reactions through oxygen uptake and ionic cyclization . The yarn samples were carbonized at 900 °C.…”

Section: Introductionmentioning

confidence: 99%

Wet‐spinning and carbonization of graphene/PAN‐based fibers: Toward improving the properties of carbon fibers

Sayyar

Moskowitz

Fox

et al. 2019

J of Applied Polymer Sci

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Graphene/polyacrylonitrile (PAN)-based composite fibers, as monofilaments, multifilaments, and yarns, were prepared through a facile solution mixing and wet-spinning method. The PAN-based (PANb) precursor was synthesized via reversible additionfragmentation chain transfer polymerization with N-isopropylacrylamide as a comonomer. Following wet-spinning, the PANb yarns were carbonized at 900 C. Scanning electron microscopy images confirmed the presence of a homogenous dispersion of graphene nanosheets inside the polymer matrix. It has been shown that the addition of graphene not only enhanced the thermal and mechanical properties of the PANb fibers, but also improved their graphitic structure after heat treatment. Tensile strength and Young's modulus of the PANb yarns were increased by 28 and 20%, respectively, on addition of 0.5 wt % graphene. Raman spectra demonstrated improvement in the graphitic structure of the carbonized yarns even at low graphene content. These graphene/ PANb fibers show potential as a suitable precursor for the development of next generation carbon fibers.

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Semibatch RAFT copolymerization of acrylonitrile and N-isopropylacrylamide: Effect of comonomer distribution on cyclization and thermal stability

Cited by 36 publications

References 34 publications

Influence of processing parameters on the properties of carbon fibres – an overview

Influence of processing parameters on the properties of carbon fibres – an overview

Simultaneous DSC/TG analysis on the thermal behavior of PAN polymers prepared by aqueous free-radical polymerization

Wet‐spinning and carbonization of graphene/PAN‐based fibers: Toward improving the properties of carbon fibers

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