Synthesis and Phase Separation Behaviour of High Performance Multiblock Copolymers

Author:

Pospiech Doris1,Häußler Liane,Eckstein Kathrin,Komber Hartmut,Voigt Dieter,Jehnichen Dieter,Friedel Peter,Gottwald Antje,Kollig Wolfram1,Kricheldorf Hans R2

Affiliation:

1. Institute of Polymer Research, Hohe Strasse 6, 01069 Dresden, Germany

2. University of Hamburg, Institute of Technical and Macromolecular Chemistry, Bundesstrasse 45, 20146 Hamburg, Germany

Abstract

The phase separation behaviour of block copolymers of the type (A–B) n(segmented block copolymers, multiblock copolymers) containing segments with different degrees of flexibility was investigated using a stepwise variation of the incorporated blocks A and B. Amorphous/rigid blocks (polysulfone segments) were systematically combined with amorphous/flexible blocks (poly(tetramethylene glycol), semiflexible/nematic blocks (different kinds of aromatic polyesters and poly(ester imides) as well as semicrystalline fluorinated polyester blocks). All multiblock copolymers were synthesized using a conventional transesterification polycondensation in the melt and the polycondensation results are discussed. The phase separation in the synthesized block copolymers was investigated both experimentally and theoretically. Flory–Huggins interaction parameters of the block copolymers were calculated and used together with mean field calculations in order to understand the phase separation behaviour of all block copolymers correlated to their chemical structure. On the other hand, the onset of phase separation in a series of block copolymers with a systematic variation of block molecular weights was examined experimentally, mainly by DSC and SAXS. Finally, the question is discussed whether or not the degree of phase separation in the investigated systems determines the properties of the polymers or not. This is for example outlined for the mechanical properties and, in particular, the surface properties of fluorinated block copolymers.

Publisher

SAGE Publications

Subject

Materials Chemistry,Organic Chemistry,Polymers and Plastics

Reference33 articles.

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2. [2] McGrath J E 1983 An Introductory Overview of Block Copolymers (MMI Press Symposium Series, vol 3) p 1-1

3. [3] Goodman I (ed) 1982 Developments in Block Copolymers vol 1 (New York: Applied Science) pp 127-127, 217-217, 261-261

4. [4] Canevarolo S V 1989 Handbook of Polymer Science and Technology: Performance Properties of Plastics and Elastomers vol 2, ed G Allen and J C Berington (New York: Dekker) pp 359-359

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