Particle size and molecular weight effects on the melt flow of emulsion PVC

Autor:	V. L. Folt, A. R. Berens
Rok vydání:	1969
Předmět:	Materials science Polymers and Plastics Rheometer General Chemistry Die swell Physics::Fluid Dynamics Condensed Matter::Soft Condensed Matter Shear rate Materials Chemistry Particle Extrusion Particle size Slippage Composite material Melt flow index
Zdroj:	Polymer Engineering and Science. 9:27-34
ISSN:	1548-2634 0032-3888
DOI:	10.1002/pen.760090105
Popis:	The melt flow behavior of straight emulsion-polymerized PVC in a capillary extrusion rheometer has been found to depend upon both the molecular weight and the particle size of the sample. Observations of flow-rate, post-extrusion swell, and extrudate appearance, as functions of extrusion temperature and pressure, suggest that both molecular deformation and particle slippage are involved in the flow mechanism. The relative importance of these two modes of flow varies with extrusion conditions and with the PVC molecular weight and particle size. Particle slippage is favored by large particle size, high molecular weight, and low temperature and by a shear stress above a critical yield value. Apparent melt viscosity, swelling, and roughness are minimized under conditions corresponding to the maximum contribution of particle slippage. In the proper range of temperature and shear rate, straight emulsion PVC yields smooth, low-swell extrudates of excellent physical properties.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::16240d0f774a13f0dc0cc9f6611222a7 https://doi.org/10.1002/pen.760090105 Zobrazit plný text záznamu Plný text