Accession Number : AD0633470

Title :   DILUTE SOLUTION PROPERTIES OF HIGH-MOLECULAR-WEIGHT POLY(ISOBUTYL METHACRYLATE). VII. EFFECT OF CENTRIFUGING ON VARIOUS PARAMETERS.

Descriptive Note : Technical rept.,

Corporate Author : PICATINNY ARSENAL DOVER N J PLASTICS AND PACKAGING LAB

Personal Author(s) : Schramm,Eleanor C. ; Valles,Richard J.

Report Date : JUN 1966

Pagination or Media Count : 68

Abstract : Three samples of high-molecular-weight poly(isobuyl methacrylate), designated 937,SW63/0082 and SW62/0298, were all found to be shear dependent. Sample SW62/0298, which has the highest molecular weight, readily dissolved in acetone and methyl ethyl ketone. Both its weight average molecular weight and its intrinsic viscosity decreased as the centrifuging time increased. The number average molecular weight, determined by light scattering, seemed to remain constant. Sample SW63/0082, with the next highest molecular weight, did not readily dissolve in acetone and methyl ethyl ketone. but again, the weight average molecular weight and the intrinsic viscosity decreased with centrifuging time, while the number average molecular weight remained constant. Sample 937 behaved somewhat differently. First, the intrinsic viscosity decreased slightly as the centrifuging time increased, but levelled off at three hours. The weight average molecular weight stayed constant for three hours, but dropped slightly after four hours. The number average molecular weight remained constant. From light scattering measurements, the molecular weight, chain dimensions, and degree of polymerization for the weight, number, and Z averages were calculated. The number average molecular weight was determined by osmometry. (Author)

Descriptors :   (*ACRYLIC RESINS, SOLUTIONS(MIXTURES)), (*MOLECULAR WEIGHT, ACRYLIC RESINS), (*VISCOSITY, ACRYLIC RESINS), ORGANIC SOLVENTS, ACETONES, BUTANONES, CENTRIFUGAL FIELDS, LIGHT, SCATTERING, MOLECULAR STRUCTURE, OSMOSIS

Subject Categories : Plastics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE