PHYSICAL AND RHEOLOGICAL PROPERTIES OF NITROSO RUBBERS
Quarterly rept. no. 6, 25 Sep-25 Dec 1964,
MONSANTO RESEARCH CORP EVERETT MA
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Four nitroso gum samples were characterized by IR, NMR, elemental analysis, intrinsic viscosity, X-ray diffraction, TGA, DTA and ClashBerg shear modulus. Infrared analyses indicated that the four gums were basically similar. NMR confirmed a previously reported structure. Elemental Analysis, however, indicated a variation in fluorine content from 61 to 67. Molecular weights by intrinsic viscosity were in the range of 1.0 to 1.3 x 10 to the 6th power. TGA confirmed a previously disclosed weight loss at 75 C with unzipping at 260C. DTA exhibited a mild exotherm at 250 C with an EXPLOSIVE exotherm at 295 C. Glass transitions of -60 C and -45 C were found by means of the Clash-Berg shear modulus apparatus. However, it was felt that the -60 C transition may be due in part to the presence of solvent.
- Elastomers and Rubber