High-pressure rheology of polystyrene melts plasticized with CO2: Experimental measurement and predictive scaling relationships

Royer, Joseph R.; Gay, Yvon J.; DeSimone, Joseph M.; Khan, Saad A.

doi:10.1002/1099-0488(20001201)38:23<3168::aid-polb170>3.0.co;2-e

Cited by 130 publications

(136 citation statements)

References 38 publications

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“…The zero shear viscosity was used as the value of viscosity. Although CO 2 -induced viscosity depression has been reported by many authors (Elkovitch et al, 2000(Elkovitch et al, , 2001Han et al, 2002;Kwag et al, 1999Kwag et al, , 2001Lee et al, 2000;Royer et al, 2000;Utracki and Simha, 2001;Xue and Tzoganakis, 2003), its effect on bubble growth may be limited (Chen et al, 2006). The zero-shear viscosity used in this study was not measured under a high-pressure CO 2 condition (Table 1).…”

Section: Physical Properties and Control Parameters Of Polymeric Foammentioning

confidence: 99%

Experimental and numerical studies on the effects of pressure release rate on number density of bubbles and bubble growth in a polymeric foaming process

Taki

2008

Chemical Engineering Science

128

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Section: Physical Properties and Control Parameters Of Polymeric Foammentioning

confidence: 99%

Experimental and numerical studies on the effects of pressure release rate on number density of bubbles and bubble growth in a polymeric foaming process

Taki

2008

Chemical Engineering Science

128

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“…The decrease in viscosity related to CO 2 addition is also consistent with literature observations. This decrease usually follows a power law [26]. However, our measurements suggest a plateau, which is not consistent with such a law.…”

Section: Evolution Of Viscosity Of the Mixturementioning

confidence: 99%

Capillary rheometry of a binary mixture polymer/CO2 in a single screw extruder

Common

Sauceau

Rodier

et al. 2015

Chemical Engineering and Processing: Process Intensification

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A B S T R A C TProcessing bio sourced polymers with supercritical fluids is a promising route towards new green engineering processes. Supercritical carbon dioxide (sc CO 2 ), is soluble in large quantities in molten polymers, where it acts as plasticizer and swelling agent. It is used, in blending or foaming of polymers, particle formation and polymerisation process.The process of hot melt extrusion assisted by sc CO 2 allowed the development of an on line viscosity measurement based on capillary rheometry. Applied to a bio sourced polyamide, it was validated by comparison with a classic capillary rheometer. Both data sets were in good agreement.A pseudoplastic fluid behaviour was observed with a 30 % viscosity decrease from 46 to 32 Pa s at 5000 s 1 and 220 C, upon addition of CO 2 . However, viscosity decreased to a plateau before reaching the thermodynamic solubility. The comparison with a model coupling solubility and flow allowed to identify the method limitations, which were attributed to the kinetics of dissolution and mixing. The higher the shear stress, the higher the amount of CO 2 at which the viscosity plateau is reached. These measurements may quantify the impact of the CO 2 on the rheology of the system but also of the efficiency of the mixing process in our experimental setup.

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“…93 The presence of gaseous or liquid diluents often alters the T g of amorphous materials. 94,95 T. S. Chow showed for polymers that the change in T g could be modeled as a function of the diluent's mass fraction (?) and characteristic parameters of the polymer/diluent mixture.…”

Section: Background On Pitch Foammentioning

confidence: 99%

Development of Continuous Solvent Extraction Processes for Coal Derived Carbon Products

Dadyburjor¹,

Heavner²,

Katakdaunde³

et al. 2006

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High-pressure rheology of polystyrene melts plasticized with CO2: Experimental measurement and predictive scaling relationships

Cited by 130 publications

References 38 publications

Experimental and numerical studies on the effects of pressure release rate on number density of bubbles and bubble growth in a polymeric foaming process

Experimental and numerical studies on the effects of pressure release rate on number density of bubbles and bubble growth in a polymeric foaming process

Capillary rheometry of a binary mixture polymer/CO2 in a single screw extruder

Development of Continuous Solvent Extraction Processes for Coal Derived Carbon Products

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