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Home  >  Journal list  >  Polymer Journal  >  Vol.14  No.5 (1982)  >  pp.391-399

Polymer Journal
<<Previous article Vol.14  No.5 (1982)   pp.391 - 399 Next article>>

Synthesis, Structure, and Mechanical Properties of A-B-A Tri-Block Copolymers Consisting of Poly(ε-N-benzyloxy-carbonyl-L-lysine) as the A Component and Polybutadiene as the B Component

Kouhei Kugo1), Toshio Hayashi1) and Akio Nakajima1)
1) Department of Polymer Chemistry, Kyoto University

ABSTRACT:  A-B-A type tri-block copolymers composed of ε-N-benzyloxycarbonyl-L-lysine as the A component and butadiene as the B component were prepared. The synthesis could be carried out by allowing the N-carboxy anhydride of the α-amino acid to react with the amineterminated polybutadiene. The structure of these block copolymers was estimated using the relation between the helix-coil transition temperature and the number-average molecular weight. The morphology of the membrane specimens was investigated by wide-angle X-ray diffraction and electron microscopy. It was found that the dynamic mechanical spectra can be well explained by the microheterophase structure observed under electron microscope. By minimizing the Gibbs free energy ΔG per unit volume for the micelle formation, the domain size was estimated for each type of micelle. The shape and size calculated were in accord with those observed by electron microscope.


Keyword:
Tri-Block Copolymer/ Poly(ε-N-benzyloxycarbonyl-L-lysine)/ Polybutadiene/ Microheterophase Structure/ Dynamic Mechanical Properties

Published online: March 03, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan

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