Temperature-dependent influence of molecular orientation and internal stresses on the deformation of injection-molded polypropylene parts

Local orientation measures by infrared dichroism and thermal stress measures by dilatometric analysis of image (DAI) have made it possible to quantify the evolution of the structure versus the thickness of the injected plastic parts. The stiffness local properties on the one hand, and thermal expans...

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Bibliographic Details
Published in:Journal of applied polymer science 1998-06, Vol.68 (10), p.1661-1669
Main Authors: Lafranche, E., Pabiot, J.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Injection moulding
injection-molded polypropylene parts
internal stress
Machinery and processing
molecular orientation
Moulding
Plastics
Polymer industry, paints, wood
Technology of polymers
temperature dependence
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Summary:Local orientation measures by infrared dichroism and thermal stress measures by dilatometric analysis of image (DAI) have made it possible to quantify the evolution of the structure versus the thickness of the injected plastic parts. The stiffness local properties on the one hand, and thermal expansion on the other hand, have then been established. Deformation measures made in temperature have pointed out its deformation induced by thermal stresses and that attributed to the gradient of molecular orientation and cristallinity of the polymer. A calculation of plastic part deformation constituted of elementary layers whose Young's modulus and coefficients of thermal expansion values have been previously evaluated, has enabled us to corroborate experimental results. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1661–1669, 1998
ISSN:0021-8995
1097-4628
DOI:10.1002/(SICI)1097-4628(19980606)68:10<1661::AID-APP15>3.0.CO;2-#