INTERIM REPT. MAY 1-JULY 31 1953 ON CONTRACT NO. NONR-1129(00) (POLYTECHNIC INSTITUTE OF BROOKLYN)
Abstract
The weight average mol wt of 2 polyvinyl acetates (Schawinigan Corp.) were determined to be 85,000 and 190,000. A low degree of branching was assumed to cause mol wt increases by factors of 2-3 when the acetate were converted to formals. The intrinsic viscosities and the interaction constants were determined from Me2CO solutions at 25 deg C. Measurements in ethylene dichloride presented unexplained difficulties. The results and derived formals in ethylene dichloride are tabulated. Two polyvinyl butyrals and 2 polyvinyl acetates (Bakelite Co) samples were investigated. The hydrolysis and reacetylation of these acetates indicated mol wt and branching similar to the Schawinigan acetates. The increase in viscosity on butyral fromation was interpreted as a sign of mol wt increase. More suitable solvent systems are being sought for precise measurements in solution. Adsorption measurements of formals and butyrals on Fe powder of uniform size produced curves with a steep initial increment in adsorption with polymer concentration followed by a flat rise.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1953
- Accession Number
- AD0018686
Entities
Organizations
- New York University Tandon School of Engineering