High heat resistant grade (GP 330-1) PLA was supplied by
Bio Green World Co. Ltd., Thailand. The Pattawia pineapple
leaves were from Rayong province, Thailand. The leaves
with 70-80 cm long were specifically chosen from pineapple
plants at the age between 12 and 14 months. Maleic Anhydride
(MA) coupling agent was purchased from Fluka, Germany
and used as received without any further purification.