ABSTRACT In this paper the influence of melt-processing on the final polymer/layered silicate nan... more ABSTRACT In this paper the influence of melt-processing on the final polymer/layered silicate nanocomposite morphology is discussed. In particular the role of shear forces on the transformation of the original large clay agglomerates is of interest. Several polymer nanocomposites were prepared by melt-extrusion, involving polycaprolactone, poly(ethylene oxide), polyamide-12 or polyamide-6 as the matrix polymer. The nanocomposite morphology was characterised by X-ray diffraction and transmission electron microscopy and the clay tactoid morphology with polarised optical microscopy and scanning electron microscopy. The development of the tactoid and nanocomposite morphology during melt-mixing under shear was studied time-resolved by optical microscopy in conjunction with a rheometer and synchrotron X-ray scattering together with a Couette type flow cell. The shear forces in the melt-preparation of polymer layered mineral nanocomposites facilitate the break-up of large-sized agglomerates, whereas the extent of further exfoliation of the mineral layers is determined by the compatibility between the polymer matrix and the mineral layers rather than by shear forces.
The rheological behaviour of polypropylene (PP)/acrylonitrilebutadiene rubber (NBR) blends has b... more The rheological behaviour of polypropylene (PP)/acrylonitrilebutadiene rubber (NBR) blends has been investigated with special reference to the effect of blend ratio, compatibilization and dynamic vulcanization. The morphology of the extrudates and the size and distribution of ...
... Materials Oil palm empty fruit bunch fibers were collected from local sources and processed b... more ... Materials Oil palm empty fruit bunch fibers were collected from local sources and processed by retting technique. ... The physical and chemical characteristics of the fiber were reported earlier [7]. Phenol formaldehyde (PF) resole type resin was used for composite preparation and ...
The phase separation behaviour and phase morphology of blends of 4,4′-diaminodiphenyl sulphone cu... more The phase separation behaviour and phase morphology of blends of 4,4′-diaminodiphenyl sulphone cured diglycidyl ether of bisphenol-A with poly(ε-caprolactone) were investigated by means of scanning electron microscopy, small angle light scattering and optical microscopy. The components are miscible prior to curing. High-temperature isothermal curing induces phase separation. Blends with near to critical concentrations demix via spinodal decomposition. The associated co-continuous morphology is only preserved in the actual critical compositions whereas for off-critical compositions it rapidly breaks up into spherical particles. The proceeding reaction in the separated phases induces a secondary phase separation. Occasionally, tertiary phase separation is observed as well. Off-critical compositions that are further away on either side from the critical point, phase separate via the direct formation of spherical particles, most likely as a result of the dynamic asymmetry of these blends. The influence of the amount, the molar mass of PCL and the cure temperature is discussed.
... Ramiro Dell'Erba a , Gabriel Groeninckx b , Giovanni Maglio Corresponding Author Contact... more ... Ramiro Dell'Erba a , Gabriel Groeninckx b , Giovanni Maglio Corresponding Author Contact Information , E-mail The Corresponding Author , c , Mario ... Thin samples between glass-slides were observed by an Olympus optical microscope equipped with a Mettler hot stage. ...
... t 3 Haslam, J., Willis, HA and Squirrel, DCM, Identification and Analysis of Plastics, 2nd ed... more ... t 3 Haslam, J., Willis, HA and Squirrel, DCM, Identification and Analysis of Plastics, 2nd edn. Heyden and Son, London, 1980, p. 292. 14 Lawson, DF, Hergenrother, WL and Matlock, MG, Polym. Pr7m, 1988, 29(2), 193. ... DF, Hergenrother. WL and Matlock, MG, ,I. Appl. Polym. ...
The miscibility and phase behaviour of the ternary blend consisting of poly(ε-caprolactone) (PCL)... more The miscibility and phase behaviour of the ternary blend consisting of poly(ε-caprolactone) (PCL), poly(styrene-co-acrylonitrile) with 15 wt% acrylonitrile (SAN15) and poly(styrene-co-maleic anhydride) with 14 wt% maleic anhydride (SMA14) have been investigated by means of visual observations, light transmission measurements, differential scanning calorimetry (d.s.c.) and dynamic mechanical thermal analysis. The influence of the molecular weight of the components and of the
ABSTRACT The semicrystalline morphology of pure PCL and of some of its miscible binary and ternar... more ABSTRACT The semicrystalline morphology of pure PCL and of some of its miscible binary and ternary blends with Phenoxy and SAN15 has been investigated by small angle X-ray scattering. Morphological parameters have been obtained from the analysis of the one-dimensional correlation function. The influence of the crystallization temperature on the semicrystalline morphology has been investigated and is compared with the melting behaviour as studied with differential scanning calorimetry. (C) 1997 Elsevier Science Ltd.
ABSTRACT In this paper the influence of melt-processing on the final polymer/layered silicate nan... more ABSTRACT In this paper the influence of melt-processing on the final polymer/layered silicate nanocomposite morphology is discussed. In particular the role of shear forces on the transformation of the original large clay agglomerates is of interest. Several polymer nanocomposites were prepared by melt-extrusion, involving polycaprolactone, poly(ethylene oxide), polyamide-12 or polyamide-6 as the matrix polymer. The nanocomposite morphology was characterised by X-ray diffraction and transmission electron microscopy and the clay tactoid morphology with polarised optical microscopy and scanning electron microscopy. The development of the tactoid and nanocomposite morphology during melt-mixing under shear was studied time-resolved by optical microscopy in conjunction with a rheometer and synchrotron X-ray scattering together with a Couette type flow cell. The shear forces in the melt-preparation of polymer layered mineral nanocomposites facilitate the break-up of large-sized agglomerates, whereas the extent of further exfoliation of the mineral layers is determined by the compatibility between the polymer matrix and the mineral layers rather than by shear forces.
The rheological behaviour of polypropylene (PP)/acrylonitrilebutadiene rubber (NBR) blends has b... more The rheological behaviour of polypropylene (PP)/acrylonitrilebutadiene rubber (NBR) blends has been investigated with special reference to the effect of blend ratio, compatibilization and dynamic vulcanization. The morphology of the extrudates and the size and distribution of ...
... Materials Oil palm empty fruit bunch fibers were collected from local sources and processed b... more ... Materials Oil palm empty fruit bunch fibers were collected from local sources and processed by retting technique. ... The physical and chemical characteristics of the fiber were reported earlier [7]. Phenol formaldehyde (PF) resole type resin was used for composite preparation and ...
The phase separation behaviour and phase morphology of blends of 4,4′-diaminodiphenyl sulphone cu... more The phase separation behaviour and phase morphology of blends of 4,4′-diaminodiphenyl sulphone cured diglycidyl ether of bisphenol-A with poly(ε-caprolactone) were investigated by means of scanning electron microscopy, small angle light scattering and optical microscopy. The components are miscible prior to curing. High-temperature isothermal curing induces phase separation. Blends with near to critical concentrations demix via spinodal decomposition. The associated co-continuous morphology is only preserved in the actual critical compositions whereas for off-critical compositions it rapidly breaks up into spherical particles. The proceeding reaction in the separated phases induces a secondary phase separation. Occasionally, tertiary phase separation is observed as well. Off-critical compositions that are further away on either side from the critical point, phase separate via the direct formation of spherical particles, most likely as a result of the dynamic asymmetry of these blends. The influence of the amount, the molar mass of PCL and the cure temperature is discussed.
... Ramiro Dell'Erba a , Gabriel Groeninckx b , Giovanni Maglio Corresponding Author Contact... more ... Ramiro Dell'Erba a , Gabriel Groeninckx b , Giovanni Maglio Corresponding Author Contact Information , E-mail The Corresponding Author , c , Mario ... Thin samples between glass-slides were observed by an Olympus optical microscope equipped with a Mettler hot stage. ...
... t 3 Haslam, J., Willis, HA and Squirrel, DCM, Identification and Analysis of Plastics, 2nd ed... more ... t 3 Haslam, J., Willis, HA and Squirrel, DCM, Identification and Analysis of Plastics, 2nd edn. Heyden and Son, London, 1980, p. 292. 14 Lawson, DF, Hergenrother, WL and Matlock, MG, Polym. Pr7m, 1988, 29(2), 193. ... DF, Hergenrother. WL and Matlock, MG, ,I. Appl. Polym. ...
The miscibility and phase behaviour of the ternary blend consisting of poly(ε-caprolactone) (PCL)... more The miscibility and phase behaviour of the ternary blend consisting of poly(ε-caprolactone) (PCL), poly(styrene-co-acrylonitrile) with 15 wt% acrylonitrile (SAN15) and poly(styrene-co-maleic anhydride) with 14 wt% maleic anhydride (SMA14) have been investigated by means of visual observations, light transmission measurements, differential scanning calorimetry (d.s.c.) and dynamic mechanical thermal analysis. The influence of the molecular weight of the components and of the
ABSTRACT The semicrystalline morphology of pure PCL and of some of its miscible binary and ternar... more ABSTRACT The semicrystalline morphology of pure PCL and of some of its miscible binary and ternary blends with Phenoxy and SAN15 has been investigated by small angle X-ray scattering. Morphological parameters have been obtained from the analysis of the one-dimensional correlation function. The influence of the crystallization temperature on the semicrystalline morphology has been investigated and is compared with the melting behaviour as studied with differential scanning calorimetry. (C) 1997 Elsevier Science Ltd.
Uploads
Papers