Functional oligomers characterization

LC CC proved especially useM in the characterization of functional oligomers. Under critical conditions, the main chain of the ohgomer is eluted irrespec-... 

This work describes the direct reaction of living polymeric carbanions to form well-defined trialkoxysilyl functional organic polymers. The macromonomers (/= 1) were subsequently hydrolyzed and condensed to yield narrow molecular weight distribution star polymers. Although telechelic (/= 2) trialkoxysilyl functional oligomers have also been prepared and studied in detail, the product after hydrolysis and condensation is an insoluble network, not a soluble star pol)mier. These crosslinked condensation products are not amenable to structural characterization in solution. 

Unfortunately, there have been very few studies on the synthesis and characterization of functionally terminated siloxane oligomers with a mixed siloxane backbone. 

Figure 5.26 Variation of the oligomer content as a function of time and temperature during the SSP process [26]. From Wick, G., Characterization of PET polymer for bottle manufacturing, presentation given at the Society of Plastics Engineers, Benelux Seminar, May 20-21, 1980, Amsterdam, and reproduced with permission of KoSa GmbH Co. KG...

In this presentation, we report the characterization of HTE liquid polymers free from the interference of cyclic oligomers. Cyclic oli omers of the higher molecular weight HTE liquid polymers (Mn>1200), including commercial Hydrin 10 liquid polymers, were removed by extraction. The functionality of the liquid polymer was then determined, and structures are proposed as determined by infrared, carbon-13 and proton NMR, and field desorption mass spectroscopic analyses. 

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