TY - JOUR
T1 - On depression of glass transition temperature of epoxy nanocomposites
AU - Liu, Gang
AU - Zhang, Hui
AU - Zhang, Dai Jun
AU - Zhang, Zhong
AU - An, Xue Feng
AU - Yi, Xiao Su
N1 - Funding Information:
Acknowledgements The authors would like to thank the National Basic Research Program of China (973 Program, Grant No. 2010CB631101) for financial support.
PY - 2012/10
Y1 - 2012/10
N2 - Epoxy composite materials filled with nanoalumina particles were prepared by mechanical mixing techniques. The glass transition temperatures (T g) of the nanocomposites were found to decline significantly with the increasing filler content. After the addition of 30-phr nanoparticles, the T g of the filled sample decreased by as high as 55 °C, as compared with that of the neat epoxy polymer. Based on the selective adsorption hypothesis and the molecular diffusion, it is speculated that the hardener molecules were unevenly distributed in the nanocomposites, which caused imbalanced stoichiometry between the epoxy and the hardener and finally decreased the T g. Some results that may support the adsorption hypothesis were given and discussed.
AB - Epoxy composite materials filled with nanoalumina particles were prepared by mechanical mixing techniques. The glass transition temperatures (T g) of the nanocomposites were found to decline significantly with the increasing filler content. After the addition of 30-phr nanoparticles, the T g of the filled sample decreased by as high as 55 °C, as compared with that of the neat epoxy polymer. Based on the selective adsorption hypothesis and the molecular diffusion, it is speculated that the hardener molecules were unevenly distributed in the nanocomposites, which caused imbalanced stoichiometry between the epoxy and the hardener and finally decreased the T g. Some results that may support the adsorption hypothesis were given and discussed.
UR - http://www.scopus.com/inward/record.url?scp=84864775551&partnerID=8YFLogxK
U2 - 10.1007/s10853-012-6633-6
DO - 10.1007/s10853-012-6633-6
M3 - Article
AN - SCOPUS:84864775551
SN - 0022-2461
VL - 47
SP - 6891
EP - 6895
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 19
ER -