PLA-Based Biodegradable Copolyester Nanocomposites: Preparation, Characterization and Mechanical Properties

Bing Tao Wang; Ping Zhang; De Gao

doi:10.4028/www.scientific.net/AMR.380.290

Paper Titles

Effects of Rice Quality by Modified Atmosphere Packing with PA/PE Composite Membrane
p.274

Polymerization and Characterization of Gas Permselectivity Functional Packaging Materials
p.278

GC-MS Studies on the Contaminants in Paper-Plastic Food Packaging Materials
p.282

The Preparation and Properties of PVA/nano-TiO₂ Composite
p.286

PLA-Based Biodegradable Copolyester Nanocomposites: Preparation, Characterization and Mechanical Properties
p.290

Study on a Solvent-Free PBA/CO-Based PU Adhesive for Aluminum-Plastics Compounding
p.294

Synthesis of Side-Chain Liquid Crystal Polymers and Preliminary Studies of the Property of Photo-Alignment
p.301

Research of Sheet-Fed Offset Damping System Green Printing Technology
p.306

The Synthesis of the Ether Compounds of Polycondensation Resin of the Pyrogallic Acid and the Divinylbenzene
p.311

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PLA-Based Biodegradable Copolyester Nanocomposites: Preparation, Characterization and Mechanical Properties

Abstract:

In situ melt copolycondensation was proposed to prepare biodegradable copolyester nanocomposites based on degradable components poly(L-lactic acid) (PLA), rigid segments poly(butylene terephthalate) (PBT), and nanoparticles polyhedral oligomeric silsesquioxanes (POSS). The morphologies and dispersions of two POSS nanoparticles (POSS-NH₂ and POSS-PEG) in the copolyester PLABT matrix and their effects on the mechanical properties were investigated. The results demonstrated that the morphologies and dispersions of POSS-NH₂ and POSS-PEG showed quite different characteristics. POSS-PEG took better dispersion in the PLABT, while POSS-NH₂ had poor dispersions and formed crystalline microaggregates. Due to the good dispersion and strong interfacial adhesion of POSS-PEG with the matrix, the tensile strength and Young’s modulus were greatly improved from 6.4 and 9.6 MPa for neat PLABT up to 11.2 and 70.7 MPa for PLABT/POSS-PEG nanocomposite. Moreover, the incorporation of POSS-PEG could impart macromolecular chains good flexibility and improve the mobility of the chains, so the the elongation at break of PLABT/POSS-PEG nanocomposite dramatically increased from 190 to 350 % compared with neat PLABT.