Polyethylene–Silica Nanocomposites with the Structure of Semi‐Interpenetrating Networks

Organic–inorganic nanocomposites with the structure of interpenetrating or semi‐interpenetrating networks are considered as advanced materials, since they have improved thermal and mechanical properties. An alternative approach to the preparation of such hybrid systems is proposed. It is based on th...

Full description

Saved in:

Bibliographic Details
Published in:	Macromolecular materials and engineering Vol. 304; no. 11
Main Authors:	Trofimchuk, Elena S., Meshkov, Ivan B., Kandlina, Margarita N., Nikonorova, Nina I., Muzafarov, Aziz M., Malyshkina, Inna A., Moskvina, Marina A., Grabovenko, Fedor I., Volynskii, Aleksandr L.
Format:	Journal Article
Language:	English
Published:	Weinheim John Wiley & Sons, Inc 01-11-2019
Subjects:	Composite materials Condensates Condensation polymerization Crazing Hybrid systems Interpenetrating networks Mechanical properties Melting points Nanocomposites Phase separation Polyethylene Polyethylenes polyethylene–silica nanocomposites Porosity proton conductivity semi‐interpenetrating networks Silicon dioxide Thermodynamic properties
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Organic–inorganic nanocomposites with the structure of interpenetrating or semi‐interpenetrating networks are considered as advanced materials, since they have improved thermal and mechanical properties. An alternative approach to the preparation of such hybrid systems is proposed. It is based on the synthesis of silica from the precursor of hyperbranched polyethoxysiloxane by the hydrolytic condensation reaction in the volume of pores of a polymer matrix (bulk porosity is 40 vol%) stretched via the environmental crazing mechanism. Polyethylene–silica nanocomposites with the structure of semi‐interpenetrating networks when the content of silica is not less than 20–25 wt% are obtained. These composites can undergo an additional phase separation at a temperature of 160 °C (above the melting point of polyethylene), which is accompanied by an increase in the size of the polymer phase with the formation of macrophases. At the same time, the environment (orthophosphoric acid), in which the composite is heated, fills the pores that have appeared. As a result, the content of the third component with the new functionality increases up to 50 wt%, which allowed us to impart proton‐conducting properties to the composite material and preserve its shape stability. A new approach to obtain the polyethylene–silica nanocomposites with the structure of semi‐interpenetrating networks using crazing mechanism is described. Heating composites above the melting point of the polymer matrix in the presence of high‐boiling liquids (e.g., orthophosphoric acid) or light‐melting solids makes it possible to load them with a third component characterized by new functional properties (e.g., proton conductivity).
ISSN:	1438-7492 1439-2054
DOI:	10.1002/mame.201900430