Clay lamellae of CL15A, both in organized stacks and in their exfoliated state, adopt roughly parallel organization modes in HDPE and HDPE-g-MA melts. Upon compression molding clay platelets tend to orient parallel to the film surface. In compression molded composites or nanocomposite samples the HDPE matrix crystallizes with the a lattice vector orthogonal to the film surface and the b and c vectors randomly oriented in the film plane. The degree of orientation increases with the degree of clay exfoliation and with clay content, for a given degree of exfoliation. The degree of orientation of HDPE-gMA/CL15A(10wt%) nanocomposites is comparable to that of PE films three orders of magnitude thinner crystallized on various substrates.4 We suggest that, given the aspecific nature of the interaction between the polymer and the surfaces determining the orientation, the interpretation of the phenomena described above may extend well beyond the present case: for example it might apply to the orientation effects described for nylon in nanocomposites in the seminal paper by Kojima et al.2 Indeed it appears to be quite general, and in the absence of specific polymerparticle interactions, orientation effects in very thin (below 0.1mm) polymer films, should be closely related to those in nanocomposites of the same polymers with their principal axis roughly in the plane of the film and the short axis perpendicular to the film surface

Structure and morphology of polymer clay nanocomposites: the contribution of X-ray diffraction

FAMULARI, ANTONINO;MEILLE, STEFANO VALDO
2007-01-01

Abstract

Clay lamellae of CL15A, both in organized stacks and in their exfoliated state, adopt roughly parallel organization modes in HDPE and HDPE-g-MA melts. Upon compression molding clay platelets tend to orient parallel to the film surface. In compression molded composites or nanocomposite samples the HDPE matrix crystallizes with the a lattice vector orthogonal to the film surface and the b and c vectors randomly oriented in the film plane. The degree of orientation increases with the degree of clay exfoliation and with clay content, for a given degree of exfoliation. The degree of orientation of HDPE-gMA/CL15A(10wt%) nanocomposites is comparable to that of PE films three orders of magnitude thinner crystallized on various substrates.4 We suggest that, given the aspecific nature of the interaction between the polymer and the surfaces determining the orientation, the interpretation of the phenomena described above may extend well beyond the present case: for example it might apply to the orientation effects described for nylon in nanocomposites in the seminal paper by Kojima et al.2 Indeed it appears to be quite general, and in the absence of specific polymerparticle interactions, orientation effects in very thin (below 0.1mm) polymer films, should be closely related to those in nanocomposites of the same polymers with their principal axis roughly in the plane of the film and the short axis perpendicular to the film surface
2007
XVIII Convegno Italiano Scienza e Tecnologia delle Macromolecole
File in questo prodotto:
File Dimensione Formato  
Famulari_AIM_2007.pdf

Accesso riservato

: Altro materiale allegato
Dimensione 6.24 MB
Formato Adobe PDF
6.24 MB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/248751
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact