DYMAT 2009
Volume 1, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 929 - 934
Section Bio-Mechanics
Published online 15 September 2009
DYMAT 2009 (2009) 929-934
DOI: 10.1051/dymat/2009130

Effect of strain rate on the mechanical properties of biodegradable polymer blends

S. Kobayashi1 and S. Ogihara2

1  Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
2  Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamasaki, Noda, Chiba 278-8510, Japan

Published online: 15 September 2009

In the present study, we investigated the strain rate dependency of Poly(lactic acid) (PLA)/poly(butylene succinate) (PBSU) polymer blends. PLA and PBSU pellets were dry mixed in the bottle with the blending ratio of PLA:PBSU = 100:0, 80:20, 50:50, 20:80 and 0:100 in weight. Specimens were injection molded with the mixture. The tensile tests were conducted using a universal testing machine (AG-50kNE, Shimadzu) with a cross-head speed of 0.01~100 mm/min and hydroelectric testing machine (V-1501, Saginomiya) with a cross-head speed of 1 m/sec. Tensile modulus kept constant up to strain rate of 10−1/s. At more than strain rate of 10−1/s, modulus of all pure polymers and polymer blends increased. The ratio of increase in modulus of polymer blend became larger with increasing PLA contents. Tensile strength of pure PBSU kept constant at the range of strain rate. On the other hand, tensile strength of pure PLA gradually increased with increasing strain rate. As a result, polymer blend showed same tendency in strain rate dependency of tensile strength. Increasing ratio of tensile strength had no dependency with PLA contents.

© EDP Sciences 2009