62 research outputs found
Preparation of epoxy-functionalized methyl methacrylate-butadiene-styrene core-shell particles and investigation of their dispersion in polyamide-6
Functional core—shell impact modifiers of glycidyl methacrylate (GMA) functionalized methyl methacrylate—butadiene—styrene (MBS) have been prepared via a seeded semi-continuous emulsion polymerization. These functional MBS—GMA particles were blended with polyamide-6. Investigations by transmission electron microscopy showed a very good dispersion of the particles in the polymeric matrix, compared with blends of MBS with polyamide-6 where a third functional polymer styrene—maleic anhydride was added
Preparation of epoxy-functionalized methyl methacrylate-butadiene-styrene core-shell particles and investigation of their dispersion in polyamide-6
Development of carpels and ovules in Dialypetalanthus fuscescens Kuhlm. (Rubiaceae): an enigmatic taxon
Interfacial Graft Copolymer Formation during Reactive Melt Blending of Polyamide 6 and Styrene−Maleic Anhydride Copolymers
Aliphatic/Aromatic polyamide blends. Relations between reactive melt processing molecular structure, semicrystalline morphology and thermal properties
ÉTUDE DES VIBRATIONS DE BASSE FRÉQUENCE DU POLYÉTHYLÈNETÉRÉPHTALATE PAR DIFFUSION INÉLASTIQUE DES NEUTRONS THERMIQUES
Les vibrations de basse fréquence (entre 1 000 et 10 cm=1) du polyéthylènetéréphtalate ont été étudiées au moyen de la diffusion inélastique de neutrons froids obtenus par filtration à travers du Be polycristallin. La distribution énergétique des neutrons diffusés a été mesurée par une technique de temps de vol. On a investigué un échantillon amorphe ainsi que des échantillons de divers degrés de cristallinité obtenus par recuit à différentes températures. Les spectres contiennent un grand nombre de maxima ; la plupart de ceux-ci apparaissent dans chaque spectre, mais avec une intensité dépendant parfois de l'état de l'échantillon. Les spectres ont été interprétés sur la base de l'analyse des données infrarouge et Raman. On observe généralement un bon accord entre les spectres optiques et les spectres neutroniques. On constate cependant dans ces derniers des variations très nettes dans l'intensité de certaines raies (notamment à 290 et à cm1=) en fonction de l'orientation moléculaire, variations qui ne sont pas révélées par les méthodes optiques.The low frequency vibrations of poly(ethyleneterephthalate) have been studied by inelastic neutron scattering. Cold neutrons were obtained by passing a reactor beam through a polycrystalline Be block. The energy distributions of the scattered neutrons were measured using a time-of-flight technique. An amorphous sample and samples of different degree of crystallinity, obtained by annealing at different temperatures, were examined. The spectra are composed of a large number of maxima. Most of them appear for every sample, but with an intensity depending on their thermal history. The experimental results were interpreted using IR and Raman data. A good agreement was generally observed between neutron and optical spectra. In the former however well defined intensity changes for certain maxima (e. g. at 290 and 215 cm=1) occured depending on molecular orientation. This influence was not detected by optical methods
Aliphatic/Aromatic polyamide blends. Relations between reactive melt processing molecular structure, semicrystalline morphology and thermal properties
Dynamic mechanical and thermal properties of physically compatibilized natural rubber/poly(methyl methacrylate) blends by the addition of natural rubber-graft- poly(methyl methacrylate)
Investigation of the Deformation and Recovery Behavior of Nylon-6/Rubber Thermoplastic Vulcanizates on the Molecular Level by Infrared-Strain Recovery Measurements
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