Nanostructured thermoset resins and nanocomposites containing hyperbranched blockcopolyether liquid rubbers and organophilic layered silicates

This work is dedicated to the improvement of materials properties of thermoset resins by the use of tailor-made additives. Inorganic nanofillers derived from layered silicates as well as functional liquid polymers of various architectures were used alone or in combination to tailor different properties, such as thermal stability, toughness or stiffness. Emphasis was also laid on easy processability of the resin systems. <br>Significant progress was made when organophilic layered silicates were added together with modified liquid poly(propylene oxide) starpolymers to epoxy resins. The resulting epoxy “hybrid nanocomposites” afforded improved toughness showing no reduction in stiffness and glass temperature. An optimized hybrid system was employed in a resin transfer moulding process to prepare carbon fibre reinforced composites containing silicate nanoparticles. Fibre impregnation was however accompanied by filtration of the organophilic silicate particles. <br>Hyperbranched blockcopolyethers with nanometer size and core/shell type topology were prepared as a new class of liquid rubbers. Subsequent modification yielded hydroxy, phenol and glycidyl end groups. A high compatibility with the matrix resin accounted for the formation of single phase epoxy blends without enhancing toughness. Hyperbranched blockcopolyethers containing oligo(allyl glycidyl ether) blocks, on the other hand, proved to be very effective toughening agents for vinyl ester urethane hybrid resins.

Author dc:creator

• Fröhlich, Jörg

Contributors dc:contributor

• Mülhaupt, Rolf

• epoxy resins
• nanocomposites
• polyether
• polymers
• layered silicates

Repository record source_url

https://freidok.uni-freiburg.de/data/781

OAI identifier oai:identifier

oai:freidok.uni-freiburg.de:781