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International Journal of Forming Processes
1292-7775
Publication suspended
 

 ARTICLE VOL 4/3-4 - 2001  - pp.511-534  - doi:10.3166/ijfp.4.511-534
TITLE
A Comparative Study of Crystallization of iPP and PA6 under Pressure

ABSTRACT

Experimental data for two semicrystalline polymers (iPP and PA6) crystallized under pressure are supplied. The effect of two typical process operating conditions (solidification pressure and cooling rate) on the final properties of the obtained product is quantified. The influence of processing conditions on some macroscopically relevant properties, such as density and micro hardness is discussed, together with the influence of processing conditions on the product morphology, investigated by means of Wide Angle X-Ray Scattering (WAXS). Results on the iPP samples display a lower density and a lower density dependence on cooling rate for increasing solidification pressure. Micro Hardness confirms the same behavior. PA6 samples exhibit an opposite behavior with density and Micro Hardness increasing with solidification pressure. A deconvolution technique was applied to iPP and PA6 WAXS patterns to evaluate the final phase content and to assess a crystallization kinetics behavior. A “negative” influence of solidification pressure on the crystallization behavior of the alpha phase might be assessed in the case of iPP, while a slightly “positive” influence of the pressure applied on the crystallization behavior of PA6 has been found.

AUTEUR(S)
Vicenzo LA CARRUBBA, Valerio BRUCATO, S. PICCAROLO

Reçu le 19 juillet 2001.    Accepté le 29 octobre 2001.

KEYWORDS
Semicrystalline polymers, pressure, cooling rate, crystallization kinetics.

LANGUE DE L'ARTICLE
Anglais

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