Structure and properties of poly(lactic acid)/poly(lactic acid)-α-cyclodextrin inclusion compound composites
-
Li Zhang
und
Yufang Zhou
Abstract
Poly(lactic acid) (PLA) was synthesized using a green catalyst, nano-zinc oxide (ZnO). The optimum synthesis conditions of PLA were as follows: a stoichiometric amount of 0.5 wt% of nano-ZnO, polymerization time of 14 h, and polymerization temperature of 170°C. Gel permeation chromatography results showed that the weight-average molecular weight (Mw) of PLA was 13,072 g/mol with a polydispersity index (PDI) of 1.7. Furthermore, PLA-α-cyclodextrin inclusion compounds (PLA-CD-ICs) were prepared by ultrasonic co-precipitation techniques. X-ray diffraction analysis and Fourier transform infrared spectroscopy demonstrated the change in lattice of α-CD from a cage configuration to a tunnel structure and the existence of some physical interactions between α-CD and PLA in the PLA-CD-ICs. To enhance the crystallization properties of PLA, PLA/PLA-CD-IC composites were blended with different contents of PLA-CD-ICs as nucleating agents. The crystallization behavior and comprehensive performance were investigated by differential scanning calorimetry, polarized optical microscopy, tensile testing, dynamic mechanical analysis, and scanning electron microscopy. Compared to PLA, the crystallinities of PLA/PLA-CD-IC composites were increased by 24.0%, 26.3%, 27.3%, and 31.8%. The results of all the analyses proved that PLA-CD-ICs were useful as green organic nucleators and improved the comprehensive performance of PLA materials.
Acknowledgements
Financial support from National Science Foundation of China (51263019) is greatly acknowledged.
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Artikel in diesem Heft
- Frontmatter
- Preparation and processing
- Cellulose modification and shaping – a review
- The effect of shear history on urea containing gliadin solutions
- Preparation and characterization of poly(ethylene 2,5-furandicarboxylate/nanocrystalline cellulose composites via solvent casting
- Material properties
- Mechanical properties of natural fibre polymer composites
- Structure and properties of poly(lactic acid)/poly(lactic acid)-α-cyclodextrin inclusion compound composites
- Fabrication of random and aligned-oriented cellulose acetate nanofibers containing betamethasone sodium phosphate: structural and cell biocompatibility evaluations
- Matrix impact on the mechanical, thermal and electrical properties of microfluidized nanofibrillated cellulose composites
- Engineering
- Bi-layered electrospun nanofibrous polyurethane-gelatin scaffold with targeted heparin release profiles for tissue engineering applications
- Fabrication of porous polymeric structures using a simple sonication technique for tissue engineering
