title: Chemical recycling of polyhydroxyalkanoates as a method towards sustainable development.
abstract: Chemical recycling of bio-based polymers polyhydroxyalkanoates (PHAs) by thermal degradation was investigated from the viewpoint of biorefinery. The thermal degradation resulted in successful transformation of PHAs into vinyl monomers using alkali earth compound (AEC) catalysts. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)s (PHBVs) were smoothly and selectively depolymerized into crotonic (CA) and 2-pentenoic (2-PA) acids at lower degradation temperatures in the presence of CaO and Mg(OH)(2) as catalysts. Obtained CA from 3-hydroxybutyrate sequences in PHBV was copolymerized with acrylic acid to produce useful water-soluble copolymers, poly(crotonic acid-co-acrylic acid) that have high glass-transition temperatures. The copolymerization of CA derived from PHA pyrolysis is an example of cascade utilization of PHAs, which meets the idea of sustainable development.
authors.affiliation: Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Putra University Malaysia, Serdang, Selangor, Malaysia. hidayah_a@biotech.upm.edu.my
authors.forename: Hidayah
authors.initials: H
authors.lastname: Ariffin
authors.forename: Haruo
authors.initials: H
authors.lastname: Nishida
authors.forename: Mohd Ali
authors.initials: MA
authors.lastname: Hassan
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Shirai
mesh_terms: D000179:Acrylates / Q000737:chemistry; D002384:Catalysis; D003437:Crotonates / Q000737:chemistry; D017743:Equipment Reuse; D006358:Hot Temperature; D019344:Lactic Acid / Q000737:chemistry; D010421:Pentanoic Acids / Q000737:chemistry; D011091:Polyesters / Q000737:chemistry*; D054813:Polyhydroxyalkanoates / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D000094122:Polyhydroxybutyrates
chemical_list: D000179:Acrylates; D003437:Crotonates; D019344:Lactic Acid; D010421:Pentanoic Acids; D011091:Polyesters; D054813:Polyhydroxyalkanoates; D011108:Polymers; C052620:poly(3-hydroxybutyrate)-co-(3-hydroxyvalerate); D000094122:Polyhydroxybutyrates; C033616:poly(lactide); C036658:acrylic acid