Studies of the Trans-Quinacridone Nucleation of Poly-(ethylene-b-propylene)

Abstract : The poly-(ethylene-b-propylene) was nucleated for a study of the structure modifications as well as the improvement of the mechanical properties, particularly the impact resistance. The nucleation was accomplished by two various red pigments: a linear trans-quinacridone dye (as ß-phase nucleator) and a dimethyl quinacridone resulting in the formation of a pure a-phase structure. Such procedure allowed the comparison of both the crystal structure and the morphology of the copolymer. For the ß-nucleated copolymer a maximum of the k-value (fraction of ß-phase) was found for a concentration of the nucleating agent of 5 × 10−4 wt.-%. By means of the WAXS measurements (in the transmission and reflection mode) an important structure gradient was detected in the cross-section of the injection moulded samples. This structure gradient was also observed by optical microscopy, where an agreement between optical observation of the spherulites and the k-value distribution on the cross-section of the samples was observed. For both nucleating agents (linear transquinacridone and dimethyl quinacridone) a dependence of the mechanical properties of the copolymer (modulus of elasticity and brittleness by impact resistance) on the pigment concentration was observed. For the ß-phase nucleated copolymer the maximum of the k-value of the hexagonal crystal structure corresponds to the highest ductility by impact test.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-mines-paristech.archives-ouvertes.fr/hal-01444006
Contributeur : Magalie Prudon <>
Soumis le : lundi 23 janvier 2017 - 15:47:07
Dernière modification le : lundi 12 novembre 2018 - 11:02:45

Identifiants

Citation

Tomasz Sterzynski, Morand Lambla, Frédéric Georgi, Michel Thomas. Studies of the Trans-Quinacridone Nucleation of Poly-(ethylene-b-propylene). International Polymer Processing, 1997, 12 (1), pp.64 - 71. ⟨10.3139/217.970064⟩. ⟨hal-01444006⟩

Partager

Métriques

Consultations de la notice

138