Impregnation of mortars with monomers and their radiolytic polymerization. [Gamma radiation]

Journal Article · Mon Oct 01 04:00:00 EDT 1984 · J. Appl. Polym. Sci.; (United States)

DOI:https://doi.org/10.1002/app.1984.070291008· OSTI ID:6117874

Gadalla, A M; El-Derini, M E

Mortars were cured for a sufficient period to give sufficient strength and were then dried to remove the free water without dehydrating the compounds formed. Dried specimens were evacuated and impregnated with a mixture of styrene and acrylonitrile monomers which gives high mechanical properties after polymerization. Positive pressure was then applied, and polymerization was done radiolytically. The effect of degree and period of evacuation, the positive pressure and the irradiation dose on monomer loading, tensile and compressive strength were studied, and the optimum operating conditions were established. The achieved strength was correlated with the fraction of open pores impregnated. The composites investigated have the same volume fraction of mortar, and the polymer is added at the expense of the open porosity causing nearly an exponential increase in strength. Only 80% of the open pores were filled with polymers due to the difference in density between the polymer and the monomer, loss of monomer, and the presence of entrapped gas consisting of residual air and residual water vapor and monomer vapor, as well as due to the inability to fill all the micropores with monomer. A compressive strengh four times that of plain mortar and a tensile strength eight times that of plain mortar were achieved. 18 references, 12 figures.

• Research Organization: Texas A and M Univ., College Station
• OSTI ID: 6117874
• Journal Information: J. Appl. Polym. Sci.; (United States), Journal Name: J. Appl. Polym. Sci.; (United States) Vol. 29:10; ISSN JAPNA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ACRYLONITRILE
ALKYLATED AROMATICS
AROMATICS
CHEMICAL RADIATION EFFECTS
CHEMISTRY
COMPRESSION STRENGTH
DATA
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
GAMMA RADIATION
HYDROCARBONS
IMPREGNATION
INFORMATION
IONIZING RADIATIONS
IRRADIATION
MECHANICAL PROPERTIES
MORTARS
NITRILES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
POLYMERS
POROSITY
PRESSURE DEPENDENCE
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
STYRENE
TENSILE PROPERTIES