✍ Scribed by W. Banks; C.T. Greenwood
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Viscosity measurements have been carried out on 12 amylose acetate fractions dissolved in (1) 43"3 per cent nitromethane: 56.7 per cent n-propanol (v/v; a 0-solvent mixture), (2) 50 per cent nitromethane: 50 per cent n-propanol (v/v), and (3) nitromethane. The following relations were obtained between limiting viscosity number and molecular weight: solvent (1), lr/] = 9-16 x 10 --2 I~lw°'~°; solvent (2), [~l = 1"70 × 10 -* 1ff1,,°'66; solvent (3), I-q] = 8-50 × 10 -2 ~I,, °'vs. The flexibility of the molecular coil in these three solvents is discussed, and the free-draining characteristics of the polymer are shown to be negligibly small.
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The polarographic behaviour of dithiodipropionic acid [S2(CH,-CH2COOH),] (referred to herein as RSSR) has been studied in aqueous and 20 % v/v methanol, ethanol, acetonitrile, DMSO and DMF media in the presence of 0.1 MKNO, and 0.01% thymol. The effects of changes in pH, concentration of RSSR, mercu