TY - JOUR
T1 - Influence of surface modified nano silica on alkyd binder before and after accelerated weathering
AU - Nikolic, Miroslav
AU - Nguyen, Hiep Dinh
AU - Daugaard, Anders Egede
AU - Löf, David
AU - Mortensen, Kell
AU - Barsberg, Søren
AU - Sanadi, Anand Ramesh
PY - 2016
Y1 - 2016
N2 - Introduction of nano fillers in exterior wood coatings is not straight forward. Influence on aging of polymer binder needs to be taken into account along with possible benefits that nano fillers can provide immediately after application. This study shows the influence of two differently modified hydrophobic nano silica on an alkyd binder for exterior wood coatings. One month after application, the highest strength and energy required to break the films was obtained with addition of 3% disilazane modified silica. Changes in tensile properties were accompanied with a small increase in glass transition temperature. However, the highest stability upon accelerated weathering, measured by ATR-IR and DMA, was for nano composites with the highest amount of nano filler. The reasons for the observed changes are discussed together with the appearance of a feature that is possibly a secondary relaxation of alkyd polymer.
AB - Introduction of nano fillers in exterior wood coatings is not straight forward. Influence on aging of polymer binder needs to be taken into account along with possible benefits that nano fillers can provide immediately after application. This study shows the influence of two differently modified hydrophobic nano silica on an alkyd binder for exterior wood coatings. One month after application, the highest strength and energy required to break the films was obtained with addition of 3% disilazane modified silica. Changes in tensile properties were accompanied with a small increase in glass transition temperature. However, the highest stability upon accelerated weathering, measured by ATR-IR and DMA, was for nano composites with the highest amount of nano filler. The reasons for the observed changes are discussed together with the appearance of a feature that is possibly a secondary relaxation of alkyd polymer.
KW - Accelerated weathering
KW - Alkyd
KW - Exterior wood coatings
KW - Nano silica
KW - Nanocomposites
KW - Surface modification
U2 - 10.1016/j.polymdegradstab.2016.02.006
DO - 10.1016/j.polymdegradstab.2016.02.006
M3 - Journal article
SN - 0141-3910
VL - 126
SP - 134
EP - 143
JO - Polymer Degradation and Stability
JF - Polymer Degradation and Stability
ER -