Effect of annealing on the mechanical properties of PLA/PCL and PLA/PCL/LTI polymer blends.

Authors :: Takayama T
Todo M
Tsuji H
Source :: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2011 Apr; Vol. 4 (3), pp. 255-60. Date of Electronic Publication: 2010 Oct 16.
Publication Year :: 2011
Abstract: The effects of annealing on the mechanical properties of polymer blends of poly(lactic acid) (PLA) and poly(ε-caprolactone) (PCL) were investigated. The bending strength and modulus of PLA/PCL tend to increase due to crystallization of the PLA phase by annealing. The mode I fracture energy, J(in), of PLA/PCL decreases dramatically due to the suppression of the ductile deformation of the spherical PCL phase by annealing. The immiscibility of PLA and PCL can be improved by adding lysine triisocyanate (LTI) as a result of additional polymerization. The phase transformation due to LTI addition reduces the size of the spherical PCL phase, resulting in higher fracture energy. An annealing process applied to PLA/PCL/LTI further strengthens the microstructure, resulting in effective improvement of the fracture energy.<br /> (Copyright © 2010 Elsevier Ltd. All rights reserved.)

Subjects :: Elastic Modulus
Lysine chemistry
Microscopy, Electron, Scanning
Surface Properties
Isocyanates chemistry
Lactic Acid chemistry
Lysine analogs & derivatives
Mechanical Phenomena
Polyesters chemistry
Polymers chemistry

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