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Polyvinyl alcohol and acidity‐regulating KH 2 PO 4 synergistically accelerated degradation of PBAT / PLA composites
Author(s) -
Liu Hailu,
Shen Huayan,
Li Fayong,
Xie Dong,
Chen Junjia
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50301
Subject(s) - polyvinyl alcohol , polylactic acid , materials science , composite number , crystallinity , hydrolysis , degradation (telecommunications) , composite material , thermal stability , biodegradation , polyester , chemical engineering , polymer , chemistry , organic chemistry , telecommunications , computer science , engineering
Poly(butylene adipate‐co‐terephthalate) (PBAT)/polylactic acid (PLA) composites were prepared by water‐soluble polyvinyl alcohol (PVA) and degradation‐promoting agent (DPA) which were made from acidity‐regulating KH 2 PO 4 and halloysite by a physical layer‐by‐layer coating method. The effect of PVA and DPA on the biodegradation of PBAT/PLA composites in the cross‐sectional morphology, thermal properties, molecular structure, due to degradation was evaluated using a host of characterization methods. The results showed that PVA had a good solubilizing effect on the composite system and improved the overall compatibility. DPA had little effect on the compatibility, crystallinity, and thermal stability of the composite system, but greatly accelerated the degradation. The interior of composite material containing DPA (Com‐DPA) was shown to be severely damaged after 29 weeks of degradation, which was attributed to preferential degradation of amorphous regions of the composite by ester hydrolysis. Our results demonstrated the PVA and DPA worked synergistically to promote swelling and diffusivity of degradation products, and provided an acid environment for enhancing ester hydrolysis. This technology may have good prospects for accelerated degradation of materials in agricultural applications.