Reducing the formation of six-membered ring ester during thermal degradation of biodegradable PHBV to enhance its thermal stability

Precise Depolymerization of Poly(3-hydoxybutyrate) by Pyrolysis

“…Several thermoanalytical procedures have been used to investigate the thermal degradation behavior of PHB, including thermogravimetry (TG) for the analysis of weight loss behavior (Kopinke et al, 1999;Galego & Rozsa, 1999;Li et al, 2001;He et al, 2001;Lee et al, 2001;Aoyagi et al, 2002;Carrasco et al, 2006;Kim et al, 2006;Kawalec et al, 2007;Liu et al, 2009;Ariffin et al, 2008Ariffin et al, , 2010, differential scanning calorimetry (DSC) for monitoring the heat of reaction (Kopinke et al, 1996), fast atom bombardment mass spectrometry (FAB-MS) (Ballistreri et al, 1989), electrospray ionization mass spectrometry (ESI-MS) (Kawalec et al, 2007), pyrolysis-mass spectrometry (Py-MS) (Abate, 1994;Kopinke et al, 1996), pyrolysisgas chromatography (Py-GC) (Lehrle, 1994), pyrolysis-GC/mass spectrometry (Py-GC/MS) (Kopinke et al, 1996(Kopinke et al, , 1997Aoyagi et al, 2002;Ariffin et al, 2008Ariffin et al, , 2010, TG/Fourier transform infrared spectroscopy (TG/FTIR) (Li et al, 2003), NMR (Melchiors et al, 1996;Kopinke et al, 1996;Ariffin et al, 2009), and pyrolysis-GC/FTIR (Li et al, 2003;Gonzalez et al, 2005), for the analysis of volatile products, and size exclusion chromatography (SEC) (Grassie et al, 1984;Kunioka & Doi, 1990;Nguyen et al, 2002;Kim et al, 2006) for the analysis of changes in molecular weight of residual PHB. (Kopinke et al, 1996;Galego & Rozsa, 1999;Li et al, 2001;…”

Synthetic routes to degradable copolymers deriving from the biosynthesized polyhydroxyalkanoates: A mini review

“…The dominant thermal degradation occurred via a random chain scission (cis-elimination) with a six-membered ring ester intermediate [51][52][53][54]. If 2,2!-bis(2-oxazoline) was introduced in the thermal degradation, a hydroxyl-terminated PHBV was achieved with an improved thermal stability [55]. Telechelic oligomers with hydroxyl groups are commonly produced via alcohololysis, a transesterification reaction of alkanediols and high molecularweight PHAs.…”

Synthesis and Characterization of Lignin-Based Polyurethane as a Potential Compatibilizer

“…Addition L-lysine-diisocyanate and L-lysine-triisocyanate as compatibilizer to the mixed of poly(D,L-lactide) and poly(ε-caprolactone) was reported be able to maintain their biocompatibility and increase the fracture toughness of materials [2]. The other general compatibilizers are poly(butylene succinate) (PBS), poly[(butylene succinate)-co-adipate] (PBSA), and poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) [3][4][5].…”