Effect of Melt Mixing Time in Internal Mixer on Mechanical Properties and Crystallization Behavior of Glycidyl Methacrylate Grafted Poly (Lactic Acid)
- 1 School of Polymer Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand
- 2 Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand
- 3 School of Polymer Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand
Abstract
Glycidyl methacrylate (GMA) was grafted onto poly (lactic acid) (PLA) by melt mixing in internal mixer using dicumyl peroxide (DCP) as an initiator. The results from proton nuclear magnetic resonance (1H-NMR) and Fourier transform infrared (FTIR) spectroscopy indicated that the grafting reaction of GMA onto PLA took place successfully. The impact strength of PLA-g-GMA was significantly higher than that of pure PLA. The crystallinity of PLA, obtained from differential scanning calorimetry (DSC), decreased after grafting. In order to obtain the optimal mixing conditions, the mixing time was varied into 7, 10 and 14 min. The optimum mixing time of 10 min was found to give the optimum mechanical properties of glycidyl methacrylate grafted poly (lactic acid) (PLA-g- GMA). However, the mixing time played no important role in impact behavior of PLA-g-GMA. In addition, the highest crystallinity was obtained with the PLA-g-GMA prepared with the mixing time of 7 min.
- Garlotta, D., et al. (2003) Mechanical and Thermal Properties of Starch-Filled Poly (D, L-Lactic Acid)/Poly (Hydroxy Ester Ether) Biodegradable Blends. Journal of Applied Polymer Science, 88, 1775-1786. http://dx.doi.org/10.1002/app.11736
- Rudnik, E. (2010) Compostable Polymer Materials. Elsevier.
- Pesetskii, S. and Makarenko, O. (2002) Grafting of Glycidyl Methacrylate to Polypropylene in an Extruder, Initiated with Organic Peroxides. Russian Journal of Applied Chemistry, 75, 629-635. http://dx.doi.org/10.1023/A:1019529400627
- Burton, E.L., et al. (2010) Reactive Grafting of Glycidyl Methacrylate onto Polypropylene. Journal of Applied Polymer Science, 117, 2707-2714. http://dx.doi.org/10.1002/app.31085
- Cho, K.Y., et al. (2008) Grafting of Glycidyl Methacrylate onto High-Density Polyethylene with Reaction Time in the Batch Mixer. Journal of Applied Polymer Science, 108, 1093-1099. http://dx.doi.org/10.1002/app.27715
- Xu, T., Tang, Z. and Zhu, J. (2012) Synthesis of Polylactide-Graft-Glycidyl Methacrylate Graft Copolymer and Its Application as a Coupling Agent in Polylactide/Bamboo Flour Biocomposites. Journal of Applied Polymer Science, 125, E622-E627. http://dx.doi.org/10.1002/app.36808
- Huang, J., et al. (1998) Crystallization and Microstructure of Poly (l-lactide-co-meso-lactide) Copolymers. Macromolecules, 31, 2593-2599. http://dx.doi.org/10.1021/ma9714629
- Orozco, V.H., et al. (2009) Preparation and Characterization of Poly (Lactic Acid)-g-Maleic Anhydride + Starch Blends. Macromolecular Symposia, 277, 69-80. http://dx.doi.org/10.1002/masy.200950309
- Liu, J., Jiang, H. and Chen, L. (2012) Grafting of Glycidyl Methacrylate onto Poly (Lactide) and Properties of PLA/ Starch Blends Compatibilized by the Grafted Copolymer. Journal of Polymers and the Environment, 20, 810-816. http://dx.doi.org/10.1007/s10924-012-0438-1
- Chen, R.-Y., et al. (2014) Poly(Lactic Acid)/Poly(Butylene Succi-nate)/Calcium Sulfate Whiskers Biodegradable Blends Prepared by Vane Extruder: Analysis of Mechanical Properties, Morphology, and Crystallization Behavior. Polymer Testing, 34, 1-9. http://dx.doi.org/10.1016/j.polymertesting.2013.12.009