Effect of dip coating polymer solutions on properties of thermoplastic cassava starch

• Main Authors: Kittisak Jantanasakulwong, Nattagarn Homsaard, Phanurot Phengchan, Pornchai Rachtanapun, Noppol Leksawasdi, Yuthana Phimolsiripol, Charin Techapun, Pensak Jantrawut
• Format: Journal
• Published: 2020
• Subjects: Chemistry; Materials Science
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85075564900&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/67678
• Institution: Chiang Mai University

© 2019 by the authors. Thermoplastic starch (TPS) was prepared by melt-mixing cassava starch with glycerol. Polyethylene (PE), polyethylene-grafted-maleic anhydride (PE-MAH) and poly(lactic acid) (PLA) solutions at 2% (w/v) were used to coat TPS using the dip coating process. The tensile strength of TPS increased with the dip coating solution technique, especially for PLA coating. Swelling index, water-soluble matter and water droplet contact angle confirmed the water resistant improvement of TPS by PE-MAH and the PLA dip coating solution. Plasticizer bleeding was found in uncoated TPS after storage, but not in the coated TPS. Coating TPS with PE-MAH and PLA improved the tensile properties, water resistance and conquered plasticizer bleeding problems in TPS.