Reaction of lower dicarboxylic acids with 4,4′-diamino-3,3′-dimethyldiphenylmethane

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Abstracts

REACTION OF LOWER DICARBOXYLIC ACIDS WITH 4,4'-DIAMINO-3,3'-DIMETHYL. DIPHENYLMETHANE

O. Y a . F e d o t o v a , I . P. L o s e r a n d S. A. Z a k o s h c h i k o v , V y s o k o m o l . s o y e d . 5: N o . 4, 5 3 1 - 5 3 4 , 1963. THE thermal stability of dicarboxylie acids and the reaction of glutaric and phnelic acids with 4,4'-diamino, 3,3'-dimethyldiphenylmethane in the melt at various temperatures have been investigated. Polyamides were obtained on polycondensation of glutaric and pimelic acids as well as of diethyl oxalate and diethyl malonate with 4,4".diamino.3,3'.dimethyldiphenylmethane and their properties were investigated. The polymers are insoluble in the ordinary solvents excepting the cresols and possess a molecular weight of 2000-6000. CORRELATIONS IN EMULSION POLYMERIZATION--I. POLYMERIZATION OF METHYL METHACRYLATE

T. K r i s h a n , M. F . M a r g a r i t o v a a n d S. S. M e d v e d e v , V y s o k o m o l . s o y e d . 5 : N o . 4, 5 3 5 - 5 4 1 , 1963. A STUDY has been made of the emulsion polymerization kinetics of methyl methacrylate in the presence of the emulsifiers MK (sodium paraffin sulphonates) a n d sodium laurate, as well as of 2 initiators (potassium persulphate and benzoyl peroxide). I n the case of pottasium persulphate the polymerization rate was found to be proportional to the square root of the emulsifier concentration. W i t h bezoyl peroxide the rate is proportional to the first power of the emulsifier concentration. The dependence of the rate upon the emulsifier concentration is expressed b y the equation: w=kcn, where n varies from 0.5 to 0. The number, dimensions and surface area of the polymer particles have been determined b y conductimetric titration. F o r the same concentration of emulsifier and initiator the over-all surface area of the polymer particles does not change with time. W i t h increase in degree of polymerization the number of polymer particles decreases, whereas their diameters increase, i.e. coalescence takes place. The results are in complete accord with the mechanism of emulsion polymerization being developed b y S. S. Medvedev a n d collaborators. CORRELATIONS IN EMULSION POLYMERIZATION--II. POLYMERIZATION OF CHLOROPRENE AND VINYLIDENE CHLORIDE

T. K r i s h a n , M. F . M a r g a r i t o v a a n d S. S. M e d v e d e v , V y s o k o m o l . s o y e d . 5: N o . 4, 5 4 2 - 5 4 5 , 1963. A STUDY has been made of the emulsion polymerization kinetic of chloroprene and vinylidene chloride in the presence of the emulsifier M K (sodium paraffin sulphonates) and sodium laurate. F o r chloroprene, potassimn persulfate a n d benzoyl peroxide served as initiators. W i t h vinylidene chloride 3 water-soluble initiators potassium persulphate, sodium perborate a n d hydrogen peroxide a n d 2 oil-soluble initiators (benzoyl peroxide and azobisisobutyronitrile) were used. The rate of reaction for chloroprene in the presence of potassium persulphate is proportional to the first power of the emulsifier concentration. The curve expressing the dependence of the polymerization rate of chloroprene upon the benzoyl peroxide concentration displays a maximum. The same regularities are observed with potassium persulfate in the polymerization of chloroprene as in the case of methyl methacrylate. The dependence of the rate upon the initiator concentration is expressed b y the equation w=kcnn, where n varies from 0-5 to 0. I n the emulsion polymerization of vinylidene chloride the rate is determined b y the equation w ~ ]CSemCn n, where 0.5~ n ~ 0.25. The specific features in the polymeri-