Concept

Polyaddition

Polyaddition (or addition polymerisation ) is a polymerization reaction that forms polymers via individual independent addition reactions. Polyaddition occurs as a reaction between functional groups on molecules with low degrees of polymerization, such as dimers, trimers and oligomers, to form species of higher molar mass. Only at nearly complete conversions does the polymer form, as in polycondensation and in contrast to chain polymerization. A typical polyaddition is the formation of a polyurethane.

Official source

https://en.wikipedia.org/wiki/Polyaddition

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Some preliminary results on the action of rhamnogalacturonase on rhamnogalacturonan oligosaccharides from beet pulp

Sugar-beet pulp was saponified and then hydrolysed with 0.1 M HCl at 80 degrees C for 72 h, and a rhamnogalacturonan fraction was isolated by ion-exchange chromatography on AG 1X8 resin. Four individual oligomers, and a mixture of oligomers with higher degrees of polymerization, were obtained by chromatography on BioGel P-4. They all presented the alpha-D-GalAp-(1-->2)-alpha-L-Rhap-(1-->4)-alpha-D-GalAp-(1-->2)-L- Rhap structure (with n greater than or equal to 2) The five fractions were submitted to h

1995

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