Structure and Deformation Behavior of Nanocomposites Based on Polypropylene and Modified Clays
article
The effects of the type and concentration of a filler and the ratio of modifier components in the filler on the structure and deformation behavior of nanocomposites based on an isotactic PP and Na+ montmorillonite (a natural clay) modified by various substrates (modifiers) were studied. Upon crystallization of this system from the melt, part of the polymer crystallizes on the surface of layered silicate particles as heterogeneous nuclei, leading to the formation a finely crystallite fraction. Crystallites of two types appear on the face and plane surfaces of clay particles. The existence of two crystal modifications of PP, α-monoclinic and β-hexagonal, in the polymer matrix was discovered. Layered silicate sheets always arrange parallel to the surface of an isotropic film prepared by melt molding. For nanocomposites, the Young modulus is higher, the strength is equal or somewhat lower, and the elongation at break is always lower than the analogous characteristics of the pure polymer. Upon cold drawing, the dimensions of cry stallites significantly decrease up to a partial amorphization of the polymer and formation of a smectic LC phase.
Topics
TNO Identifier
237366
ISSN
0965545X
Source
Polymer Science - Series A, 45(11), pp. 1140-1152.
Pages
1140-1152
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