Prepared using high performance stretch Volume Bionic structural material flow field regulation microstructure
Polylactic acid (PLA) as the most promising one of biodegradable polymers, because of poor toughness, ductility, and thermal deformation capacity has been greatly limited in large-scale applications. Preparation also has high toughness, good ductility, high strength, high modulus and excellent resistance to thermal deformation capacity of PLA remains a huge challenge. However, the biological nature with limited resources through sophisticated structure of the building, to build a complicated multi-layered structure, thereby having excellent strength and toughness. However, the native structure and completely reproduce the material by artificial synthesis and processing of multi-level regulation of theof the material microstructure is difficult. South China University of Technology Academy team EXTRUDER developed a new processing equipment – Volume extensional rheology eccentric rotor extruder (Eccentric Rotor Extruder, ERE) [ 123], which is equipped with a strong stretching continuous volume flow field, the flow field using ERE regulatable tensile material microstructure alignment structure (Composites Science and Technology, 2019, 169, 135-141). Inspired by the multi-level structure of compact bone orientation using the orientation microstructure tensile ERE volume flow field structures may be regulated material EXTRUDER Academy team on an industrial scale of the PLA Bionic structural material Preparation and \”ACS Applied Materials & Interfaces\” entitled \”ConstructingBone-Mimicking High-Performance Structured Poly (lactic acid) by an Elongational Flow Field and Facile Annealing Process\” of research papers on journals . The PLA imitation bone structure materials with unique multi-level structure, to obtain a similar compact bone collagen by volume in the flow field generated in-situ tensile nanofibers TPU (Thermoplastic Poly (ether) urethane Nanofibers, TNFs)Fibers (Collagenfibers), PLA nanosheet crystals (lamellae) regularly arranged along TNFs oriented constructs similar to compact bone hydroxyapatite nanocrystals (HA), TNFs formed with good quality and dense interfacial layer of PLA lamellae Collagen fibers bone interface similar to HA. The PLA imitation bone structural materials interlocked three-dimensional network of interconnected lamellae (Interlocked 3D Network Lamellae) extended-chain and platelets (Extended-chain Lamellae) reinforcing the strength and modulus of the structural material; so that the PLA Bionic while super tough material having a structure also has a high modulus, an excellent balance between strength and thermal deformation resistance.
2 ) as compared to Young\’s modulus 2.15 GPa PLA capacity Bionic structural material, breaking elongation of 48.5%, notched impact strength was 69.0 KJ / m 2 (∥) and 90.3KJ / m 2 (⊥), 24.3% were improved, 8.4,27.6 and 32.3 times, the tensile strength decreased only 9.7%; while it breaks the polymer composite material significantly toughened unavoidable a significant reduction in material strength and modulus of the conventional wisdom, and PLA Bionic structural material while also having good thermal deformation resistance. Such rapid industrial grade of PLA Bionic structural material having excellent properties can be enormous potential applications in the field of construction and bio-engineered material, such as artificial bones and tissue scaffolds. The first author of this paper is Dr. School of Mechanical and Automotive Engineering, South China University of Technology He Yue, Qu Jinping Academy of Sciences is corresponding author of the paper.