Accession Number:

ADA158900

Title:

Phase Relations in Multicomponent Polymer Systems.

Descriptive Note:

Final rept. 1 Jun 77-31 Aug 85,

Corporate Author:

CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND METALLURGICAL ENGINEERING

Personal Author(s):

Report Date:

1985-08-31

Pagination or Media Count:

8.0

Abstract:

In this project a number of polymer blend systems were studied to find the thermodynamic factors controlling the compatibility, such as the temperature, concentration, molecular weight and the copolymer composition, etc. Topics investigated include The polymer-polymer interaction parameter between polystyrene and polybutadiene was determined, and the applicability of mean field theories Flory-Huggins theory and the equation-of-state theory to the polymer miscibility was ascertained. The feasibility of determining the thickness of interfaces between dissimilar polymers by means of small-angle X-ray scattering was critically examined. The occurrence of the order-disorder transition in block copolymer system were investigated. Light scattering and small-angle X-ray scattering were utilized to study the phase transition and phase separation behavior of mixtures of a homopolymer and a block copolymer, and this led to the construction of phase diagrams which exhibit many new features not found with other types of polymer blends. Deuteration of polystyrene was found not to influence its miscibility with polybutadiene. The effectiveness of a random or block copolymer as a compatibilizer of homopolymer blends was investigated. The effect of molecular weight polydipersity on the cloud point curves of polymeric blends was investigated.

Subject Categories:

  • Plastics
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE