Abstract
In order to improve the phase morphology of bioabsorbable polymer blend of poly(lactic acid) (PLA) and poly (ε-caprolacton) (PCL), an additive with the isocyanate group, lysine tri-isocyanate (LTI), was used, and the effects of LTI addition on the fracture energy, J in, and the related fracture micromechanism were investigated. The study showed that J in effectively increases with an increase in LTI. Microscopic examination of the mode I fracture surfaces also exhibited that the size of the PCL phases dramatically decreases due to LTI addition, leading to the reduction of void formation and suppression of local stress concentration, and therefore resulting in the increase of the fracture energy. The improved miscibility also contributes to the ductility enhancement, which further increases the fracture energy. In order to improve the mechanical properties, such as the bending modulus and strength, the annealing process was conducted for PLA/PCL and PLA/PCL/LTI blends. The mechanical properties of both the blends effectively increased due to the strengthened structures by crystallization of PLA. J in of PLA/PCL largely reduced by annealing; on the other hand, that of PLA/PCL/LTI effectively improved. The well-entangled structure of PLA/PCL/LTI results in the elongated ductile fracture of firmly connected fibrils; as a result, the energy dissipation during fracture initiation is largely increased.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Mohanty AK, Misra M, Hinrichsen G (2000) Macromol Mater Eng 276/277:1–24
Higashi S, Tamamoto T, Nakamura T, et al (1986) Biomaterials 7:183–187
Todo M, Shinohara N, Arakawa K (2002) J Mater Sci Lett 21:1203–1206
Todo M, Shinohara N, Arakawa K, et al (2003) Kobunshi Ronbunshu 60:644–651
Park SD, Todo M, Arakawa K (2004) J Mater Sci 39:1113–1116
Park SD, Todo M, Arakawa K (2004) Key Eng Mater 261/263:105–110
Park SD, Todo M, Arakawa K (2005) J Mater Sci 40:1055–1058
Tsuji H, Ikada Y (1996) J Appl Polym Sci 60:2367–2375
Todo M, Park SD, Takayama T, Arakawa K (2007) Eng Frac Mech 74:1872–1883
Wang L, Ma W, Gross RA, et al (1998) Polym Degrad Stab 59:161–168
Hiljanen M, Varpomaa P, Sppala J, et al (1996) Macromol Chem Phys 197:1503–1523
Meredith JC, Amis EJ (2000) Macromol Chem Phys 201:733–739
Tsuji H, Yamada T, Suzuki M, et al (2003) Polym Int 52:269–275
Dell’ Erba R, Groeninckx G, Maglio G, et al (2001) Polymer 42:7831–7840
Harada M, Hayashi H, Iida K, et al (2003) Polym Prepr 52:965
Takayama T, Todo M, Arakawa K, et al (2006) Trans Jpn Soc Mech Eng 72:713–718
Takayama T, Todo M (2006) J Mater Sci 41:4989–4992
Takayama T, Todo M, Tsuji H, et al (2006) J Mater Sci 41:6501–6504
Tsuji H, Ikada Y (1995) Polymer 36:2709–2716
Fischer EW, Sterzel HJ, Wegner G (1973) Kolloid-Z u Z Polym 251:980
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2007 Springer
About this chapter
Cite this chapter
Todo, M., Takayama, T. (2007). Toughening of bioabsorbable polymer blend by microstructural modification. In: Watanabe, M., Okuno, O., Sasaki, K., Takahashi, N., Suzuki, O., Takada, H. (eds) Interface Oral Health Science 2007. Springer, Tokyo. https://doi.org/10.1007/978-4-431-76690-2_9
Download citation
DOI: https://doi.org/10.1007/978-4-431-76690-2_9
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-76689-6
Online ISBN: 978-4-431-76690-2
eBook Packages: MedicineMedicine (R0)