Films of PHB with and without PEG were prepared by casting
using the following proportions of PHB/PEG: 100/0, 98/2,
95/5, 90/10, 80/20 and 60/40 (wt%). Pure PHB is represented
by 100/0. The materials were dissolved in chloroform to give
15% (w/w) solutions that were stirred thoroughly at 60 1 C
for 10 min and then poured into Pyrex recipients after which
the solvent was allowed to evaporate in a saturated atmosphere.