Claude-Marcel Bruneau

Average functionalities of macromolecules in stepwise polyfunctional polymerization

Abstract General expressions are derived for the average functionalities of macromolecules in stepwise polyfunctional polymerization, in particular for systems composed of monomers endowed with both A and B coreactive functional groups. Knowing the molecular distribution functions the weight average functionalities are calculated directly, on the basis of a new method using the propagation expectation.

Intrinsic unequal reactivity and average molecular weights in non-linear stepwise polymerization

Abstract The general expressions of average molecular weights in the pre-gel region, for stepwise polymerization of polyfunctional monomers endowed with both A and B coreactive functional groups, are extended to systems where some or all of the B groups react at different rates. The method of calculation is always based on the propagation expectation and the presence of by-product in the reactions is taken into account.

GRAPH THEORY AND MOLECULAR DISTRIBUTION Part I: copolycondensation of polyfunctional monomers bearing identical reactive groups

Abstract The equilibrium distribution for a random f-functional polycondensation system was derived by different probability arguments by Flory, Stockmayer, Good, Gordon, Whittle and others. The extension of these techniques to more complex systems involves abstract mathematics and often requires deriving probability generating functions. This study shows how Graph Theory allows one to obtain directly and readily theses molecular distribution functions in the most general systems of order I, i.e. consisting of various monomer units with different functionalities, all sites being identical and equireactive.

Fixation de lysine par sa fonction αNH2 sur chaîne oligométhacrylique

Resume La lysine a ete fixee par sa fonction αNH 2 sur des oligochloroformiates derivant de chaines oligomethacryliques. Apres fixation, les extremites acide et αNH 2 ont ete debloquees. Les spectres RMN 1 H et 13 C ainsi que les spectres infra rouge des differents composes sont donnes.

Determination of the repartition of monomers between sol and gel fractions in copolycondensate glycerol/azelaic acid by radioassay

The distribution of the monomers between sol and gel fractions, theoretically forecasted from network formation theory, is experimentally determined in glycerol/azelaic acid system with tritium labeled glycerol by radioassay.