Homogenizing Properties of Diblock Polymers in Blends of Corresponding Homopolymers.
Abstract
A series of blends was prepared form homopolymers and diblock coploymers of 1,2-polybutadiene and 1,4-polybutadiene. Samples were studied by dynamic mechanical analysis and transmission electron microscopy to determine whether a homogeneous or heterogeneous morphology existed. Although blends of the homopolymers exhibit phase separation, inclusion of an appropriate amount of a diblock polymer can lead to a homogeneous morphology. The materials examined covered a wide range of molecular weight, composition, and diblock copolymer fraction in the blend, enabling an experimental phase diagram to be determined. These findings are compared with current theories of phase behavior for blends of diblock copolymers and homopolymers. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 22, 1983
- Accession Number
- ADA132832
Entities
People
- Mark A. Hartney
- Robert E. Cohen
Organizations
- Massachusetts Institute of Technology