2.4.2. Water uptake
The water uptake of 2.5phrCTS-t-ENR, 5phrCTS-t-ENR,
10phrCTS-t-ENR, 15phrCTS-t-ENR and 20phrCTS-t-ENR was performed
according to ASTM D570-95 standard. Each sample was in
the form of rectangular bar measuring 30mmlong, 5mmwide and
2 mm thick. All the samples were immersed in water at room
temperature inside a closed bottle. Each sample was removed from
thewater after 48 h interval, wiped with dried cloth and weighed to
the nearest 0.001 g. For comparison, this experiment was also
carried for CTS and 0phrCTS-t-ENR. The formula used to calculate
experimental percentage water uptake is shown in Equation