Polyblends of Poly(Styrene-b-Butadiene-b-Styrene) and Polystyrene. II. Electron Microscopy.
Abstract
Electron micrographs of a series of polyblends of poly(styrene-b-butadiene-b-styrene), SBS, and polystyrene, PS, are presented. These polyblends were cast from three different solvents, i.e., tetrahydrofuran/methyl ethyl ketone (THF/MEK), benzene/heptane and carbon tetrachloride. PS of four different molecular weights were used. It is shown that when the molecular weight of PS exceeds that in the block copolymer, a third phase in the form of 'islands' is formed. Lamellar-like structures are formed in the block domains upon the addition of homopolymer. Stretching perturbs the morphology of the block domains somewhat, and produces craze marks in the PS islands. The craze marks are removed upon annealing. These results are discussed in conjunction with the observed mechanical behavior of the same polyblends reported in part I of this series.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1976
- Accession Number
- ADA023218
Entities
People
- G. Akovali
- M. Niinomi
- Meikun Shen
Organizations
- University of California, Berkeley