Analysis of the Mechanical Properties of Solvent Cast Blends of PLA/PCL

Abstract:

Polylactic acid (PLA) is the most promising material in the biodegradable category. However, brittleness and poor thermal stability restrict its application. To overcome this limitation, PLA may be blended with other biodegradable materials to tailor its properties while maintain biodegradability. In this study a series of blends of PLA and poly (ε-caprolactone) (PCL) with various mass fractions were prepared by solution method and solvent casting. Films of each blend were formed when the solvent evaporated. Subsequently, tensile test samples were punched out of the film for testing and tensile testing, Fourier transform infrared spectrometry (FTIR), Differential scanning Calorimetry (DSC) and contact angle measurements were carried out. Since PCL is a ductile material, the two materials were blended together in an effort to improve the mechanical properties. However, on thermal analysis of the blends, two individual melting peaks were observed in the DSC thermograms. Furthermore, no significant shift in peaks was observed on the FTIR spectra, and clear droplets and boundaries between two components of the blend can be observed in morphology study, all indicated the immiscibility of PLA and PCL. Tensile test showed poor mechanical properties due to the poor adhesion of the two immiscible components of the blend, and the addition of PCL did not influence the wettability of the surface of the blends as there were no significant differences in contact angle measurements.

• Periodical: Applied Mechanics and Materials (Volume 679)
• Pages: 50-56
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.679.50
• Online since: October 2014
• Authors: Yuan Yuan Chen, Luke M. Geever, Clement L. Higginbotham, Declan M. Devine
• Keywords: Contact Angle, Miscibility, Poly (ε-caprolactone), Poly(lactic acid) (PLA), Solvent Casting, Tensile Test

References

[1] Lin Xiao, Bo Wang, Guang Yang, Mario Gauthier. Poly(Lactic Acic)-based Biomaterials: Synthesis, Modification and Applications. biomedical science, engineering and technology. s. l. : In Tech, 2012, pp.247-282.

DOI: 10.5772/23927

[2] Rafael Auras, Loong Tak Lim, Susan E. M. Selke, Hideto Tsuji. Polylactic acid synthesis, structure, properties, processing, and applications, Wiley, USA , (2010).

[3] Sheth, M. et al. Biodegradable polymer blends of poly(lactic acid) and poly(ethylene glycol), Journal of applied polymer science, Vol. 66 (1997), pp.1495-1505.

DOI: 10.1002/(sici)1097-4628(19971121)66:8<1495::aid-app10>3.0.co;2-3

[4] Racha Al-Itry, K. L. A. M., 2012. l and mechanical properties of PLA, PBAT and their blends by reactive extrusion with functionalized epoxy. polymer degradation and stability, Volume 97, p.1898-(1914).

DOI: 10.1016/j.polymdegradstab.2012.06.028

[5] Katrin GanB, A. N. K. F. K. S., 2012. difficulties in the use of ground bacterial cellulose as reinforcement of polylactid acid using melt-mixing and extrusion technologies. scientific research, Volume 2, pp.97-103.

DOI: 10.4236/ojcm.2012.23011

[6] M.A. Rodriguez-Perez, J. S. J., 2006. preparation and charaterization of poly(L-lactic acid) -Chitosan hybrid scaffolds with degu release capability. wiley interscience, pp.427-435.

[7] Maria Ann Woodruff, D. W. H., 2010. the return of a forgottenpolymer-polycaprolactone in the 21st centry. progress in polymer science, Volume 35, pp.1217-1256.

DOI: 10.1016/j.progpolymsci.2010.04.002

[8] Todo, M. T. T. T. H. A. K., 2007. fracture micromechanisms of bioabsorbable PLLA/PCL polymer blends. engineering fracture mechanics, Volume 74, pp.1872-1883.

DOI: 10.1016/j.engfracmech.2006.05.021

[9] N. Lopez-Rodriguez, A. Lopez-Arraiza, E. Meaurio, J. R. Sarasua. Crystallization, morphology, and mechanical behavior of polylactide/poly(ε-caprolactone) blends, POLYM. ENG. SCI., Vol. 46 (2006), pp.1299-1308.

DOI: 10.1002/pen.20609

[10] M. E. Broz, D. L. VanerHart, N. R. Washburn. Structure and mechanical properties of polyD, L-lactic acid/ polycaprolactone blends, Biomaterials, Vol. 24 (2003), pp.4181-4190.

DOI: 10.1016/s0142-9612(03)00314-4

[11] Todo, M., Takayama, T., Tsuji, H. Arakawa, K. Fracture micromechanisms of bioabsorbable PLLA/PCL polymer blends, Engineering fracture mechanics, Vol. 74 (2007), pp.1872-1883.

DOI: 10.1016/j.engfracmech.2006.05.021

[12] Boo Yong Shin, Do Hung Han. Compatibilization of immiscible polylactic acid/ polycaprolactone blend through electron beam irradiation with the addition of compatibilizing agent, Radiation physics and chemistry, Vol. 83 (2012), pp.98-104.

DOI: 10.1016/j.radphyschem.2012.10.001

[13] Tatiana Patricio, Paulo Bartolo. Thermal stability of PLA/PLA blends produced by physical blending process, Procedia engineering , Vol. 59 (2013), pp.292-297.

DOI: 10.1016/j.proeng.2013.05.124

[14] Jen-Taut Yeh, Ching-Ju wu, Chi-Hui Tsou, Wan-Lan Chai, Jing-Dong Chow, Chi-Yuan Huang, Kan-Nan Chen, Chin-San Wu. Study on the crystallization, miscibility, morphplogy, properties of polylactic acid/polycaprolactone blends, Polymer plastics technology and engineering , Vol. 48 (2009).

DOI: 10.1080/03602550902824390

[15] Wisam H. Hoidy, M. B. A. E. A. J. A. -M. N. A. B. I., 2010. preparation and characterization of polylactic acid/polycaprolactone clay nanocomposites. Volume 10.

[16] Maria Ann Woodruff, D. W. H., 2010. the return of a forgottenpolymer-polycaprolactone in the 21st centry. progress in polymer science, Volume 35, pp.1217-1256.

DOI: 10.1016/j.progpolymsci.2010.04.002

[17] Tatiana Patricio, P. B., 2013. thermal stability of PCL/PLA blends produced by physical blending process. procedia engineering, Volume 59, pp.292-297.

DOI: 10.1016/j.proeng.2013.05.124