chapter 11,, Predicting and Measuring the Sequence Distribution of condensation Polymers,,, apparso nel libro ISBN9781441967992 messo in vendita da Springer edito da Bruni"

The sequence of polycarbonates polyesters polyamides and other condensation copolymers is discussed. The theory predicts that the sequence is often radically different from addition polymers. One of the causes is the presence of a larger number of distinct monomers in the reaction vessel. Condensation copolymers from symmetric and asymmetric monomers involve a different number of parameters to be modeled, since asymmetric monomers require an additional parameter. A peculiar reaction is discussed, namely the synthesis of copolymers obtained by melt-mixing two different homopolymers. The sequence of copolymer fractions collected at the exit of a liquid chromatographic device is discussed as well. The measurement of condensation-polymer sequence distribution can be performed using nuclear magnetic resonance (NMR) and mass spectrometry (MS). Examples drawn from recent literature are discussed.