Thermal behavior of drawn acrylic fibers

Sen, Kushal; Bajaj, P.; Sreekumar, T. V.

doi:10.1002/polb.10609

Cited by 54 publications

(28 citation statements)

References 43 publications

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“…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 . This kind of process control leads to varying processes differing for instance in stabilisation (stepwise temperature treatment in continuous processes and linear change of temperature in batch processes) and can therefore hardly be compared.…”

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 dependence of the diffraction intensity on the azimuthal angle well fits into a Gaussian function using the Peak Fitting Module (PFM) of OriginPro 7.5. The FWHM, H, of the azimuthal scan curve was used to calculate the degree of orientation (π ) [16] …”

Section: Effect Of Jet Stretch On the Orientationmentioning

confidence: 99%

Effect of Jet Swell and Jet Stretch on the Structure of Wet-Spun Polyacrylonitrile Fiber

Ouyang

Chen

Zhang

et al. 2011

Journal of Macromolecular Science, Part B

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The jet swell effect in the wet spinning of polyacrylonitrile (PAN) fiber was studied by optical microscopy and the jet swell ratio was obtained through directly measuring the diameter of the freely extruded fibers. For reflecting the actual drawing situation of the fibers in the coagulation process, the jet stretches were then corrected from the apparent values to the true values, and their effect on the cross-sectional morphology, internal structure, and orientation of the wet-spun PAN fibers was studied by optical microscopy, scanning electron microscopy, and X-ray diffraction, respectively. The results showed that jet stretch plays an important role in eliminating the adverse effects caused by the jet swell effect and affects the fiber structure; PAN fibers of uniform denier, dense and homogenous structure, and high orientation can only be obtained at a suitable jet stretch.

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“…The spinnability is effected by the properties of the spinning solution and by the coagulation bath conditions on wet spinning; various factors that influence the coagulation process include polymer composition, [8][9][10][11][12] molecular weight and distribution, [13][14][15][16][17][18][19][20][21] coagulation bath composition, [22][23][24][25][26] coagulation bath temperature, [27][28][29][30][31] and minus jet stretch. 32 Despite numerous studies on the fabrication and industrialization of produced PAN fibers, the molecular orientation of fiber materials obtained through the drawing process governs its properties, particularly the mechanical properties. A high degree of orientation produces high-filament-tenacity material; accordingly, the drawing process has been one of the most important procedures used to fabricate carbon fiber precursors.…”

Section: Introductionmentioning

confidence: 99%

Effect of the drawing process on the wet spinning of polyacrylonitrile fibers in a system of dimethyl sulfoxide and water

Wang

Bai

et al. 2007

J of Applied Polymer Sci

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The effect of the drawing process on the structural characteristics and mechanical properties of polyacrylonitrile (PAN) fibers was comparatively studied. The protofibers extruded from the spinneret were the initial phase of stretching, which involved the deformation of the primitive fiber with the concurrent orientation of the fibrils. Wet-spun PAN fibers observed by scanning electron microscopy exhibited different cross-sectional shapes as the draw ratio was varied. X-ray diffraction results revealed that the crystalline orientation of PAN fibers increased with increasing draw ratio; these differences in the orientation behaviors were attributed to the various drawing mechanisms involved. The crystalline and amorphous orientations of the PAN fibers showed different features; at the same time, the tensile properties were strongly dependent on the draw ratio. However, the stream stretch ratio had most influence on the tensile strength and the orientation of PAN fibers for the selected process parameters. Electron spin resonance proved that the local morphology and segmental dynamics of the protofibers were due to a more heterogeneous environment caused by the sequence structure. Differential scanning calorimetry indicated that the size and shape of the exotherm and exoenergic reaction were strongly dependent on the morphology and physical changes occurring during fiber formation.

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Thermal behavior of drawn acrylic fibers

Cited by 54 publications

References 43 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

Effect of Jet Swell and Jet Stretch on the Structure of Wet-Spun Polyacrylonitrile Fiber

Effect of the drawing process on the wet spinning of polyacrylonitrile fibers in a system of dimethyl sulfoxide and water

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