Accession Number : ADA334877

Title :   Microstructure and Modeling of Edge Dislocations and Grain Boundaries in Polydiacetylenes

Descriptive Note : Final rept.

Corporate Author : AIR FORCE RESEARCH LAB BOLLING AFB DC

Personal Author(s) : Wilson, Patricia M.

PDF Url : ADA334877

Report Date : 1994

Pagination or Media Count : 213

Abstract : The organization of polymers near defects is a general question of both scientific and technological interest. The relationship between microstructure and properties must involve a discussion of defects. But defects in macromolecular materials are not as clearly defined as in more ordered systems. Schemes to classify defects must rely on the symmetry of the phase, the dimensionality of the defect and the nature of the deformation induced. Several researchers such as Kleman (1983) and Wunderlich (1973) have classified macromolecular defects using these constraints. Defects in polymer systems have not been thoroughly studied because of difficulties in imaging the local regions around defects in organic materials with high energy electron beams. Also, defects are difficult to isolate and study in detail because most polymer systems have a intermediate amount of disorder present in the bulk structure.

Descriptors :   *MICROSTRUCTURE, *POLYMERS, *DEFECTS(MATERIALS), *GRAIN BOUNDARIES, *ACETYLENES, MODELS, MATERIALS, COMPOSITE MATERIALS, EDGES, DEFORMATION, THESES, ORDER DISORDER TRANSFORMATIONS, HIGH ENERGY, ELECTRON BEAMS, DISLOCATIONS, SYMMETRY, ORGANIC MATERIALS, MACROMOLECULES, MOLECULAR STRUCTURE.

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE