Accession Number : ADA132832


Title :   Homogenizing Properties of Diblock Polymers in Blends of Corresponding Homopolymers.


Descriptive Note : Technical rept.,


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING


Personal Author(s) : Hartney,Mark A ; Cohen,Robert E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a132832.pdf


Report Date : 22 Aug 1983


Pagination or Media Count : 38


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)


Descriptors :   *Polymers , *Blending , *Homogeneity , Block copolymers , Styrenes , Polybutadiene , Copolymerization , Morphology , Compatibility , Synthesis(Chemistry) , Molecular weight , Phase diagrams


Subject Categories : Polymer Chemistry
      Plastics


Distribution Statement : APPROVED FOR PUBLIC RELEASE