STUDY OF THE PROPERTIES OF SOME GRAFT COPOLYMERS. I. PREPARATION OF SAMPLES. STUDY OF SOLUBILITY AND SWELLING

Journal Article · Sun Sep 01 00:00:00 EDT 1963 · Journal de Chimie Physique (France) Merged with Rev. Gen. Colloides to form J. Chim. Phys. Rev. Gen. Colloides

OSTI ID:4145834

Chapiro, A; Jendrychowska-Bonamour, A -M

Graft copolymers having incompatible constituents were prepared radiochemically. A study of their properties has led to the following results. The solubility of the polystyrene- polyacrylonitrile graft copolymer in solventprecipitant media depends on the character of the precipitant used. By grouping the character of the precipitants according to the value of internal energy density delta , it is ssen that in the case of precipitants having delta greater than that of polyacrylonitrile, the graft copolymers are more soluble than the two constituent homopolymers. When the value of delta of the precipitant is between that of the two constituent polymers, the solubility of the graft copolymers is intermediate between that of the two homopolymers. If the value of delta of the precipitant is much smaller than the delta of the polystyrene, the graft copolymers containing 34 and 58% polystyrene are less soluble than the two constituent homopolymers. The copolymer containing 88% polystyrene has the same solubility as polystyrene. Swelling of the polyethylene- polyacrylonitrile in xylene at 50 deg has a maximum for the copolymer containing 7% acrylonitrile. This effect seems due to a decrease of the crystallinity of the polyethylene during grafting, which results in an easier penetration of the copolymer by the solvent. At 100 deg , pure polyethylene is completely soluble in xylene. Grafting of acrylonitrile progressively decreases this solubility. (tr-auth)

• Research Organization: C.N.R.S., Bellevue, France
• NSA Number: NSA-18-001749
• OSTI ID: 4145834
• Journal Information: Journal de Chimie Physique (France) Merged with Rev. Gen. Colloides to form J. Chim. Phys. Rev. Gen. Colloides, Vol. Vol: 60; Other Information: Orig. Receipt Date: 31-DEC-64
• Country of Publication: Country unknown/Code not available
• Language: French

Related Subjects

CHEMISTRY
ABSORPTION
ACRYLIC ACID
ARSENIC 78
CRYSTALLIZATION
CYANIDES
DECAY
DEUTERIUM COMPOUNDS
DIAGRAMS
ENERGY LEVELS
EQUATIONS
ETHYLENE
EXPANSION
GAMMA RADIATION
GRAFT POLYMERS
HEAVY WATER
INFRARED RADIATION
ISOTOPIC EXCHANGE
MEASURED VALUES
METASTABLE STATES
NITRILES
ORGANIC CHLORINE COMPOUNDS
PHOTOMETRY
POLYETHYLENES
POLYMERS
POLYSTYRENE
PRECIPITATION
REACTION KINETICS
SODIUM HYDROXIDES
SOLUBILITY
SOLVENTS
SPECTRA
SPECTROSCOPY
TABLES
WATER
XYLENE