Compatibilizing Effect of Random or Block Copolymer Added to Binary Mixture of Homopolymers.
Abstract
When copolymer A-B is added to the mixture of homopolymer A and homopolymer B, the compatibility between the two homopolymers is enhanced under certain conditions. Analysis, based on the Flory-Huggins free energy of mixing, gives the specific conditions under which the critical, spinodal or binodal temperature of the ternary mixture is expected to be lowered linearly with the amount of the added copolymer. Experimental measurements were performed on the changes in the cloud point of the mixtures of polystyrene and polybutadiene to which varying amounts of styrene/butadiene random or diblock copolymer were added. The results agree with the theoretical expectation. From quantitative analysis of the cloud point depression, the temeprature coefficient of the interaction energy density between styrene and butadiene polymers is determined. The temperature coefficient is found to give an excellent agreement with the value previously determined by a curve fitting procedure applied to the cloud point curves of binary mixtures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1985
- Accession Number
- ADA157384
Entities
People
- D. Rigby
- J. L. Lin
- R. J. Roe
Organizations
- University of Cincinnati