ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Mechanical properties, shear modulus, and damping of a series of polyacid divalent metal salts have been correlated with the degree of salt formation. The salts were prepared in situ by molding mixed powders of 94/6 acrylic acid-2-ethylhexyl acrylate and zinc oxide at temperatures of 200-300°C. and pressures of 5,000-10,000 psi. Zinc oxide consumption was followed by x-ray techniques. Compositions contained 25-200% of theory metal oxide as charged. Excesses, over theory, of metal oxide were shown to lead to the formation of substantial amounts of pendent half-salts which are high damping and have temperature-sensitive shear moduli. Only complete reaction as the di-salt, at 300°C. and 10,000 psi, leads to low damping products with temperature-insensitive high modulus. The modulus increase due to ionic bonding as the di-salt, over that expected from classical filler action alone, ranged from 40 to 80%, depending upon the theory chosen to calculate filler action. The pendent half-salt gives much smaller moduli increases and unreacted metal oxide appears to act as classical filler in an intertangled complex polyelectrolyte salt matrix. The modulus of the di-salt was found to be 6-7 times higher than moduli for normal organic rigid polymers.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1968.070120506
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