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Song L, Chi W, Zhang Q, Ren J, Yang B, Cong F, Li Y, Wang W, Li X, Wang Y. High-performance and functional fully bio-based polylactic acid/polypropylene carbonate blends by in situ multistep reaction-induced interfacial control. Int J Biol Macromol 2024; 258:128799. [PMID: 38110165 DOI: 10.1016/j.ijbiomac.2023.128799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 12/10/2023] [Accepted: 12/12/2023] [Indexed: 12/20/2023]
Abstract
Using a solvent-free radical grafting technique, glycidyl methacrylate (GMA) and maleic anhydride (MAH) were used as functionalized graft monomers, styrene (St) as a copolymer monomer, and grafted onto polylactic acid (PLA). A series of PLA-g-(GMA/MAH-co-St) graft copolymers were prepared by adjusting the GMA/MAH ratio. Subsequently, the prepared graft copolymers were used as a compatibilizer with PLA and polypropylene carbonate (PPC) for melt blending to prepare PLA/PPC/PLA-g-(GMA/MAH-co-St) blends. The effects of changes in the GMA/MAH ratio in the graft copolymer on the thermodynamics, rheology, optics, degradation performance, mechanical properties, and microstructure of the blend were studied. The results found that GMA, MAH, and St were successfully grafted onto PLA, and the PLA-g-(GMA/MAH-co-St) graft copolymer obtained from the reaction had a good toughening effect on the PLA/PPC blend system, which significantly improved the mechanical properties of the PLA/PPC/PLA-g-(GMA/MAH-co-St) blend without reducing its degradation performance, resulting in a biodegradable blend material with excellent comprehensive performance. In the PLA-g-(GMA/MAH-co-St) grafting reaction system, when GMA/MAH = 1.5/1.5 (w/w), the grafting degree of the graft copolymer increased most significantly, from 0.83 phr to 1.51 phr. This composition of graft copolymer can effectively improve the compatibility between PLA and PPC. The resulting PLA/PPC blend can maintain good melt flow properties (MFR of 14.51 g/10 min), high transparency, and low haze (light transmittance of 91.56 %, haze of 20.5 %), while significantly improving its thermal stability (T95%, Tmax, and Et increased by 12.87 °C, 20.33 °C, and 32.00 kJ/mol, respectively). Moreover, when introducing PLA-g-(GMA/MAH-co-St) (GMA/MAH = 1.5/1.5 (wt/wt)) graft copolymer into the system, the toughness of the PLA/PPC/PLA-g-(GMA/MAH-co-St) blend system is optimal, with the notch impact strength and fracture elongation increasing to 184.6 % and 535.4 % of the PLA/PPC blend, respectively, at which point the fracture surface of the impact sample shows a wrinkled fracture feature indicative of toughness.
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Affiliation(s)
- Lixin Song
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China.
| | - Weihan Chi
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Qian Zhang
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China
| | - Jiannan Ren
- AVIC Shenyang Aircraft Corporation, Shenyang 110850, China
| | - Bing Yang
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Fei Cong
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yongchao Li
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Wei Wang
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; BatteroTech Corporation Limited, Shanghai 201417, China
| | - Xianliang Li
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yuanxia Wang
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
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