title: Toughening polylactide with polyether-block-amide and thermoplastic starch acetate: Influence of starch esterification degree.
abstract: Native corn starch was esterified with acetic anhydride and plasticized with glycerol to give the thermoplastic starch acetate (TPSA). TPSA was blended with polylactide (PLA) and polyether-block-amide-graft-glycidyl methacrylate (PEBA-g-GMA) to obtain biodegradable PLA/PEBA-g-GMA/TPSA blends with high notched impact resistance and low cost. Compared with PLA/PEBA-g-GMA blends, as much as 9 wt% expensive PEBA-g-GMA elastomer could be substituted by the slightly acetylated thermoplastic starch while retaining high impact strength. The mechanical properties depended on the esterification degree of starch acetate. The impact strength, tensile strength and elongation at break increased to the peak value with increasing the esterification degree from 0 to 0.04, thereafter they decreased on further increasing the esterification degree. The morphological results showed that the TPSA particles were smaller and more uniform at the optimum esterification degree of 0.04, leading to the peak value of the mechanical properties.
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China; University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
authors.forename: Linyao
authors.initials: L
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. Electronic address: gyzh@ciac.ac.cn.
authors.forename: Guiyan
authors.initials: G
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
authors.forename: Yulin
authors.initials: Y
authors.lastname: Feng
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Yin
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. Electronic address: wjiang@ciac.ac.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Jiang
mesh_terms: D000577:Amides / Q000737:chemistry*; D004852:Epoxy Compounds / Q000737:chemistry; D004951:Esterification; D004987:Ethers / Q000737:chemistry*; D008689:Methacrylates / Q000737:chemistry; D011091:Polyesters / Q000737:chemistry*; D013213:Starch / Q000031:analogs & derivatives* / Q000737:chemistry; D013696:Temperature
chemical_list: D000577:Amides; D004852:Epoxy Compounds; D004987:Ethers; D008689:Methacrylates; D011091:Polyesters; C033616:poly(lactide); D013213:Starch; C050766:starch acetate; C007870:glycidyl methacrylate
keywords: Biodegradable polymer blends; Esterification; Impact resistant; Polylactide (PLA); Starch acetate