Premium
Network Formation in PP/Layered Silicate Nanocomposites: Modeling and Analysis of Rheological Properties
Author(s) -
Kovács János,
Dominkovics Zita,
Vörös György,
Pukánszky Béla
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200850708
Subject(s) - silicate , rheology , montmorillonite , polypropylene , materials science , nanocomposite , relaxation (psychology) , network structure , viscosity , rheometry , composite material , silicate glass , chemical engineering , polymer chemistry , computer science , psychology , social psychology , machine learning , engineering
PP/organophilic montmorillonite composites were prepared from PP homopolymer, maleinated polypropylene and a clay organophilized with octadecyl amine. Various approaches were used to analyze the rheological properties of the composites. Cole‐Cole plots proved to be useful, since they detect the network very sensitively. The frequency dependence of the real part of complex viscosity was described with a series of Maxwel bodies coupled parallel to each other. The relaxation time of the melt changed in the range of 0.0005 and 200 sec. Under certain conditions long relaxation times appear in the spectrum, which indicate the formation of new structural units, probably a silicate network. A certain number of silicate layers are needed to create a house‐of‐cards structure. A threshold concentration of MAPP exists for network formation, which depends on silicate content.