Accession Number : AD0728295

Title :   Characterization of Low-Molecular-Weight Difunctional Polybutadienes,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT VALCARTIER QUEBEC

Personal Author(s) : Perrault,G. ; Tremblay,M. ; Lavertu,R. ; Tremblay,R.

Report Date : 1971

Pagination or Media Count : 16

Abstract : Hydroxylesterification and esterification reactions were made on alpha, omega-dicarboxypolybutadiene polymers and the products characterized by both analytical and preparative gel permeation chromatography. The choice of a calibration curve to study transformation of polymers is discussed, as well as the reasons for adopting the Moore calibration curve relating size of polymers to elution volume. An automatic Fortran program was used to calculate number-average and weight-average sizes of polymers from the chromatograms. Problems associated with changes in the distribution of a polymer during a reaction are examined. To relate sizes of polymers in solution to molecular weight, measurements were made by vapor phase osmometry, light scattering and viscosity. The constancy of the refractive index increments with polymer size has been verified. (Author)

Descriptors :   (*POLYMERS, *MOLECULAR WEIGHT), BUTADIENES, CHROMATOGRAPHIC ANALYSIS, CALIBRATION, CANADA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE