Smaller particles of wood flour
were then removed by filtration twice using filter paper (2 lm) and poly(tetrafluoroethylene)
(PTFE) membrane (0.45 lm) respectively. PVC solution was prepared at
a concentration of 0.1% (w/v) by dissolving it in tetrahydrofuran (THF) and then filtering
by using PTFE membrane at room temperature.