Rheological Properties of Gas-Containing Thermoplastic Materials During Extrusion

Fridman, Moti; Sabsai, O. Yu.; Nikolaeva, N. E.; Barshtein, G.R.

doi:10.1177/0021955x8902500610

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…Extrusion foaming is widely being used in manufacturing continuous simple twodimensional profiles through which various foam densities could be obtained. The foam morphology in extrusion foaming could be controlled via controlling several parameters such as die temperature profile [3][4], die geometry (i.e., L/D ratio) [5][6][7][8][9][10], die pressure and pressure drop rate [12][13][14][15][16][17], melt rheological properties [18][19][20][21][22][23][24][25][26], crystallization kinetics [ 30] of the polymer/gas mixture, and the type and content of blowing agents [31][32][33][34]. Among the blowing agents, despite their high solubility in polymer melts, the use of hydro-fluorocarbons(HFCs), hydro-chloro-fluoro-carbon (HCFCs) and hydrocarbons is banned due to their toxic and flammable features [35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Extrusion Foaming of High Impact Polystyrene: Effects of Processing Parameters and Materials Composition

Demirtaş¹,

Özkan²,

Nofar³

2018

Int J Mater Sci Res

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This study investigates the extrusion foaming behavior of high impact polystyrene (HIPS) through a twin-screw extruder using two various types of chemical blowing agents (CBA). The die temperature profile was firstly tailored during the foaming of HIPS for two different CBAs. Then the CBA content effect on the foaming behavior of HIPS was verified for both CBAs. The effect of screw speed (RPM) on the foaming behavior of HIPS was, subsequently, illustrated for both CBAs. It was found that the cell density and the void fraction of the HIPS foamed samples increased at the maximum CBA content of 5 wt% and the minimum screw RPM of 100. The HIPS extrusion foaming behavior was further investigated via blending it with general purpose PS (GPPS) at the blending ratios (wt%/wt%) of 75/25 and 50/50, as well as, via compounding HIPS with three different inorganic fillers (i.e., micro-lamellar talc, talc, and calcium carbonate) at three different contents (i.e., 1, 2, and 3 wt %). The increase in GPPS and inorganic filler contents increased the cell density and void fraction of HIPS foams while the inorganic filler type did not reveal much differences in the foaming results.

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Section: Introductionmentioning

confidence: 99%

Extrusion Foaming of High Impact Polystyrene: Effects of Processing Parameters and Materials Composition

Demirtaş¹,

Özkan²,

Nofar³

2018

Int J Mater Sci Res

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Mathematical modeling and numerical simulation for nucleated solution flow through slit die in foam extrusion

Stephen

Bhattacharya

Khan

2006

Polymer Engineering & Sci

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Nucleated solution flow models have been previously developed by Baldwin and coworkers to aid modular design of the foam extrusion process. A framework of previously developed design models is applied here to investigate the flow of nucleated polypropylene–CO2 solution system. Refinement to the design models is introduced through viscosity reduction factors and Redlich‐Kwong equation of state to describe nonideal gas. These models incorporate temperature and concentration dependency of viscosity, surface tension, and solubility. Simulated results of pressure profiles and volumetric flow rates using a power law rheological equation are compared with experimental values from a three pressure tapping slit die. The influence of temperature on the profiles and its effect on design models is discussed. Preliminary results show that temperature plays an important role in the categorization of process design models. POLYM. ENG. SCI., 46:751–762, 2006. © 2006 Society of Plastics Engineers

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Rheological Behavior of Mixtures of Polystyrene with HCFC 142b and HFC 134a

Gendron

Daigneault

Caron³

1999

Journal of Cellular Plastics

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The processes for the production of thermoplastic foams, often in the shape of extruded sheets or boards, are largely dictated by the rheology of the mixture of a polymeric matrix with a blowing agent. This paper focuses on the theological behavior of mixtures of polystyrene (PS) and physical blowing agents (HCFC 142b and HFC 134a), examined using a commercial on-line rheometer mounted on an intermeshing co-rotating twin-screw extruder. The PS resin was extruded while the blowing agent was injected at high pressure and various compositions. The extent of plasticization was found to be dependent on the blowing agent concentration and its type. The effects of type of blowing agent, composition, pressure, shear rate and temperature on the theological response were measured. These variables were incorporated into a generalized mathematical model, which described the viscosity of the PS/blowing agent mixture over the studied range.

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Rheological Properties of Gas-Containing Thermoplastic Materials During Extrusion

Cited by 6 publications

References 23 publications

Extrusion Foaming of High Impact Polystyrene: Effects of Processing Parameters and Materials Composition

Extrusion Foaming of High Impact Polystyrene: Effects of Processing Parameters and Materials Composition

Mathematical modeling and numerical simulation for nucleated solution flow through slit die in foam extrusion

Rheological Behavior of Mixtures of Polystyrene with HCFC 142b and HFC 134a

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