Phase behavior of binary blends of symmetric polystyrene-polybutadiene diblock copolymers studied using SANS

C. M. Papadakis, K. Mortensen, D. Posselt

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Binary blends of compositionally symmetric diblock copolymers are investigated using small-angle neutron scattering. The study focuses on the miscibility of blends of polystyrene-polybutadiene diblock copolymers as a function of chain length ratio and blend composition, and the results are related to the theoretical phase diagram put forward by M.W. Matsen (J. Chem. Phys. 103, 3268 (1995)). Three different low molar mass copolymers were blended with a high molar mass copolymer. We find very good coincidence with the theoretical phase diagram obtained. Only for blends having a chain length ratio of 0.06, theory predicts that a larger amount of short copolymers can be dissolved in the matrix of long copolymers, and vice versa. With the latter blends and volume fractions of short chains between 0.11 and 0.70, the second-order Bragg-peaks do not vanish, which indicates that the lamellae are asymmetric.

Original languageEnglish
Pages (from-to)325-332
Number of pages8
JournalEuropean Physical Journal B
Volume4
Issue number3
DOIs
StatePublished - 1998
Externally publishedYes

Keywords

  • 61.12.Ex Neutron scattering techniques (including small-angle scattering)
  • 61.41.+e Polymers, elastomers, and plastics
  • 64.60.Cn Order-disorder transformations; statistical mechanics of model systems

Fingerprint

Dive into the research topics of 'Phase behavior of binary blends of symmetric polystyrene-polybutadiene diblock copolymers studied using SANS'. Together they form a unique fingerprint.

Cite this