Radiation aging and chemi-crystallization processes in polyoxymethylene
Article dans une revue avec comité de lecture
Date
2011Journal
European Polymer JournalAbstract
The radiochemical degradation of a polyoxymethylene homopolymer (POM) was used to study the effects of molar mass changes in the crystalline structure. The dose rate was 20 kGy h -1 with doses of up to 30 kGy used. Both WAXS and SAXS were used to analyse the structures. Results showed that, under irradiation, the polymer undergoes random chain scission. The radiochemical yield was found to be G = 1.6 chain scission events per 100 eV. It was found that no crosslinking occurs and that only one chain scission mechanism, leading to the formation of formate groups, operates. Proof for the existence of chemi-crystallization is evidenced by (i) an increase in the crystallinity ratio as well as (ii) a decrease in the amorphous layer thickness. Simple models, derived from Rault's theory, are used to predict both (i) and (ii) from molar mass values.
Files in this item
Related items
Showing items related by title, author, creator and subject.
-
Article dans une revue avec comité de lectureDJOUANI, Fatma; VERDU, Jacques; FLACONNECHE, Bruno; FAYOLLE, Bruno; RICHAUD, Emmanuel (Institut Français du Pétrole, 2015)This paper deals with polymer-fuel interaction focusing on specific effects of biofuels on polyethylene (PE) in automotive applications. The practical objective is to develop a predictable approach for durability of ...
-
Role of strain induced crystallization and oxidative crosslinking in fracture properties of rubbers Article dans une revue avec comité de lectureLE GAC, Pierre Yves; BROUDIN, Morgane; ROUX, Gérard; VERDU, Jacques; DAVIES, Peter; FAYOLLE, Bruno (Elsevier, 2014)Tensile properties and crack propagation properties, especially critical strain energy release rate in mode I, GIC, have been used to investigate fracture properties of elastomers and their relationships with microstructure. ...
-
Article dans une revue avec comité de lectureCHEMINGUI, Mahmoud; VERDU, Jacques; FEROUANI, Abdel Karim; LEFEBVRE, Jean–Marc Marc R.; FAYOLLE, Bruno (Elsevier, 2011)Ageing of polymers results from structural modifications at the molecular scale and kinetic modelling must be elaborated from analysis of the phenomenon at this scale. However, the change of mechanical properties results ...
-
Chapitre d'ouvrage scientifiqueNatural organic materials (wood, horn, skin, etc.) have been used since the dawn of humanity. Textile fabrication from vegetal fibers (linen, cotton, etc.) or from animals (silk, wool, etc.) reached an “industrial” stage ...
-
Article dans une revue avec comité de lectureDegradation induced by thermal (50-110 °C) and radio-oxidation of low T g epoxy-amine networks has been studied. It has been found that oxidation leads mainly to amide groups formation at the vicinity of tertiary amines ...