The role of transient rheology in polymeric sintering

Scribben, Eric; Baird, Donald G.; Wapperom, Peter

doi:10.1007/s00397-005-0039-1

Cited by 32 publications

(40 citation statements)

References 13 publications

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“…Although a few published works deal with the compaction of polymer powders [1–3, 5, 8–12], or with the sintering of polymers [3, 8, 13–17] including PTFE [4, 5, 9, 18–20], to the authors' knowledge, the work presented in this article is one of the first published studies dedicated to the qualitative identification of the different strain mechanisms, which are responsible for the macroscopic deformations developed during the sintering heat treatment of compacted PTFE powder. This work should constitute the first step of a study the aim of which is to build a predictive model of the deformations of PTFE parts during their manufacturing process, to better control this compaction and sintering process and, ultimately, to predict the physical and mechanical properties at each point of the parts before their use.…”

Section: Introductionmentioning

confidence: 99%

Experimental identification of the deformation mechanisms during sintering of cold compacted polytetrafluoroethylene powders

Canto

Schmitt

Carvalho

et al. 2011

Polymer Engineering & Sci

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The influence of the cooling rate after melting on the crystalline weight fraction of pure poly(tetrafluoroethylene) (PTFE) was derived from differential scanning calorimetry tests. Specimens made of pure or filled PTFE were manufactured by isostatic or constrained uniaxial cold pressing, up to different values of the porosity. Dilatometry tests were carried out on these specimens while imposing various heating–cooling treatments. The deformations recorded during these tests strongly depend on the mode and level of compaction. The original procedures presented, herein, made it possible to identify that these macroscopic deformations, which are strongly anisotropic for uniaxially pressed specimens, result from the combination of different independent mechanisms. The mechanisms that were distinguished are reversible thermal expansion, void closure, crystalline to amorphous and vice versa transformations, and recovery, which were not observed for isostatically pressed specimens. It was also shown that, after being subjected to a standard sintering treatment, anisotropically pressed specimens still exhibit anisotropic crystallization strains. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Experimental identification of the deformation mechanisms during sintering of cold compacted polytetrafluoroethylene powders

Canto

Schmitt

Carvalho

et al. 2011

Polymer Engineering & Sci

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“…An effort has been made to develop a model in witch the transient rheology is taken into account [6,7]. An effort has been made to develop a model in witch the transient rheology is taken into account [6,7].…”

Section: Literature Reviewmentioning

confidence: 99%

Sintering Of Polymers: Comprehension, Modeling And Application To Rotomolding Process

Muller¹,

Maazouz²

2007

AIP Conference Proceedings

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Sintering process is a phenomenon that occurs during the heating phase of a rotomolding cycle. Experiments were done using ethylene-propene copolymer, poly(ethylene) and grafted poly(ethylene). The temperatures chosen are the typical transformation temperatures for rotomolded parts. Two substrates were used to investigate their effects on the sintering. It appears that poly (ethylene) coalesces faster than grafted poly (ethylene), despite the first one has the higher viscosity. Interfacial tension between the material and its substrate seems to take a part in the sintering process. This is not taken into account in the models.

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“…Fluids with the elasticity property of solids as well as viscous property of liquids are called viscoelastic fluids. These fluid flows have numerous and wide-ranging applications in various fields, e.g., petrochemical, biomedical and environmental engineering including polypropylene coalescence sintering, dynamically -loaded journal bearings, blood flow and geological flows [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Radiation Absorption and Chemical Reaction Effects on Rivlin-Ericksen Flow Past a Vertical Moving Porous Plate

Sravanthi

Gorla

2019

International Journal of Applied Mechanics and Engineering

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An analysis has been carried out to study the combined effects of radiation absorption and chemical reaction on an incompressible, electrically conducting and radiating flow of a Rivlin-Ericksen fluid along a semi-infinite vertical permeable moving plate in the presence of a transverse applied magnetic field. It is assumed that the suction velocity, the temperature and the concentration at the wall are exponentially varying with time. The dimensionless governing equations for this investigation are solved analytically using two-term harmonic and non-harmonic functions. A comparison is made with the available results in the literature for a special case and our results are in very good agreement with the known results. A parametric study of the physical parameters is made and results are presented through graphs and tables. The results indicate that the fluid velocity and temperature could be controlled by varying the radiation absorption.

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The role of transient rheology in polymeric sintering

Cited by 32 publications

References 13 publications

Experimental identification of the deformation mechanisms during sintering of cold compacted polytetrafluoroethylene powders

Experimental identification of the deformation mechanisms during sintering of cold compacted polytetrafluoroethylene powders

Sintering Of Polymers: Comprehension, Modeling And Application To Rotomolding Process

Radiation Absorption and Chemical Reaction Effects on Rivlin-Ericksen Flow Past a Vertical Moving Porous Plate

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