PLA-Based Biodegradable Copolyester Nanocomposites: Preparation, Characterization and Mechanical Properties
| Periodical | Advanced Materials Research (Volume 380) |
|---|---|
| Main Theme | Green Printing and Packaging Materials |
| Edited by | Ouyang Yun, Xu Min and Yang Li |
| Pages | 290-293 |
| DOI | 10.4028/www.scientific.net/AMR.380.290 |
| Citation | Bing Tao Wang et al., 2011, Advanced Materials Research, 380, 290 |
| Online since | November, 2011 |
| Authors | Bing Tao Wang, Ping Zhang, De Gao |
| Keywords | Biodegradable Copolyester, Nanocomposite, PLA, POSS |
| Price | US$ 28,- |
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.
