Dynamically vulcanized poly (lactic acid)/polyurethane/MXene nanocomposites with balanced stiffness and toughness. (22nd August 2022)

• Record Type: Journal Article
• Authors: Lu, Xiang; Sheng, Mengjie; Deng, Yanhong; Lu, Jiuling; Wu, Hao; Li, Yi; Liu, Zhigang; Tong, Yi; Qu, Jin-Ping
• Is Part Of: Polymer. Volume 255(2022)
• Publication Date: 2022-08-22
• Subjects: Poly (lactic acid) -- MXene -- Nanocomposites -- Dynamic vulcanization -- Properties; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2022.125165
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: When brittle poly (lactic acid) (PLA) toughened by elastomers, loss of strength and modulus are inevitable, how to avoid the strength and modulus loss for elastomer toughened PLA is an urgent problem to be solved. In this study, a one-step dynamic vulcanization strategy was reported to prepare PLA/polyurethane (PU)/MXene nanocomposites with balanced stiffness and toughness based on the reaction between polyethylene glycol (PEG) and isophorone diisocyanate trimer (IPDIT). The effect of MXene content on the morphology, mechanical properties, thermal transitions and rheological behavior were investigated in detail. The results show that the PU generated during the dynamic vulcanization process and PLA have very good compatibility, and MXene nanosheets can be well dispersed in PLA/PU polymer matrix after pre-intercalation with PEG molecular chains. This study provides a promising strategy for manufacturing high performance PLA with balanced stiffness and toughness at industrial level. Graphical abstract: PLA/polyurethane (PU)/MXene nanocomposites with balanced stiffness (tensile strength of 34.0 MPa) and toughness (elongation at break of 162% and impact strength of 14.1 kJ/m 2 ) based on the reaction between polyethylene glycol (PEG) and isophorone diisocyanate trimer (IPDIT) were fabricated through one-step dynamic vulcanization strategy. Image 1 Highlights: A one-step dynamic vulcanization strategy was used to prepare PLA/PU/MXene. The fabricated PLA/PU/MXene nanocomposites have balanced stiffness and toughness. The generated PU during the fabrication process have good compatibility with PLA. The MXene can greatly improve tensile strength of PLA/PU/MXene with little content.