title: Morphology and mechanical properties of poly(butylene adipate-co-terephthalate)/potato starch blends in the presence of synthesized reactive compatibilizer or modified poly(butylene adipate-co-terephthalate).
abstract: The biodegradable poly(butylene adipate-co-terephthalate)(PBAT)/thermoplastic starch (TPS) composite has received considerable attention because of the environmental concerns raised by solid waste disposal. However, the application of PBAT/TPS blends was limited due to the poor mechanical properties originating from the incompatibility between PBAT and TPS. In this work, two approaches were developed to improve the mechanical properties of PBAT/TPS blends. One approach is to use compatibilizers, including the synthesized reactive compatibilizer - a styrene-maleic anhydride-glycidyl methacrylate (SMG) terpolymer, and the commercial compatibilizer (Joncryl-ADR-4368). The chemical structures of SMG were analyzed with (1)H NMR and FT-IR. The other approach is to use the modified PBAT (M-PBAT) to replace part of PBAT in the PBAT/TPS blends. M-PBATs with higher molecular weight were obtained via reactive extrusion of PBAT in the presence of a chain extender. The better dispersion of TPS in PBAT was observed in SEM images when using M-PBAT, leading to the higher tensile strength and elongation at break of PBAT/TPS blends. However, the elongation at break decreased in the presence of compatibilizer (SMG or 4368), though the tensile strength remained in a similar level or slightly higher. Overall, the tensile strength and the elongation at break of the resulting biodegradable PBAT/M-PBAT/TPS blends (TPS=40wt%) were above 27.0MPa and 500%, respectively, which is promising for various applications, including packaging and agricultural mulching films.
authors.affiliation: School of Materials Science and Engineering, Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai, China; Department of Chemical Engineering, University of New Brunswick, Fredericton, Canada.
authors.forename: Dafu
authors.initials: D
authors.lastname: Wei
authors.affiliation: Department of Chemical Engineering, University of New Brunswick, Fredericton, Canada.
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Chemical Engineering, University of New Brunswick, Fredericton, Canada. Electronic address: hxiao@unb.ca.
authors.forename: Huining
authors.initials: H
authors.lastname: Xiao
authors.affiliation: School of Materials Science and Engineering, Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai, China.
authors.forename: Anna
authors.initials: A
authors.lastname: Zheng
authors.affiliation: School of Environmental Science & Engineering, North China Electric Power University, Baoding, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
mesh_terms: D004852:Epoxy Compounds / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008299:Maleic Anhydrides / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011091:Polyesters / Q000138:chemical synthesis / Q000737:chemistry*; D011198:Solanum tuberosum / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry*; D020058:Styrene / Q000737:chemistry; D013718:Tensile Strength
chemical_list: D004852:Epoxy Compounds; D008299:Maleic Anhydrides; D008689:Methacrylates; D011091:Polyesters; C488797:poly(butylene adipate-co-butylene terephthalate); D020058:Styrene; D013213:Starch; C007870:glycidyl methacrylate
keywords: Biodegradable film; Mechanical properties; PBAT; Reactive extrusion; TPS