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Room temperature processable heat‐resistant epoxy‐oxazolidone‐based syntactic foams
Author(s) -
Robert Temina Mary,
Nair Soorya,
Mathew Dona,
Reghunadhan Nair C.P.
Publication year - 2018
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4094
Subject(s) - glass microsphere , syntactic foam , materials science , composite material , thermal conductivity , epoxy , limiting oxygen index , flammability , thermal expansion , filler (materials) , microsphere , chemical engineering , pyrolysis , char , engineering
Syntactic foams based on oxazolidone‐modified epoxy resin using glass microballoons as reinforcing filler with varying densities were processed. The influence of various grades of microballoons and their concentration on the mechanical, thermal, thermomechanical, and flammability characteristics were investigated. The effect of temperature on the compressive strength with density was monitored in detail. By incorporating the microballoons, T g of the syntactic foam increased from 90 °C to 115 °C. Thermal conductivity was found to decrease from (0.064 to 0.056 W/(m·K)) in conjunction with decreasing resin to filler ratio. In the case of composites filled with K25 alone, the creation of large voids due to less effective packing between the microballoons led to lower thermal conductivity. The specific heat of the different composites was in the range of 0.32 to 0.44 cal/g/°C, and the coefficient of thermal expansion was in the range of 13.2 to 17.4 × 10 −6 /°C with limiting oxygen index of 28% to 33%.