Oligomer analysis

Ionisation mode Oligomer analysis Polymer MWD Reference... 

Off-line coupling of HPLC with FD-MS has been used by several authors [118-121] for the determination of oligomers, oligomeric antioxidants (such as poly-TMDQ), ozonation and vulcanisation products. Pausch [122] reported on rubbers, cyclic polyurethane oligomers, as well as on the determination of the molecular weight distribution (up to 5300 Da) and oligomer analysis of polystyrene. Also the components of an aniline-acetone resin were deduced from FD-MS molecular weights [122]. 

Relatively few descriptions of direct mass spectral analysis of plastics compounds have appeared in the literature [22,37,63,240,243], Additives in PP were thermally desorbed into a heated reservoir inlet for 80 eV EI-MS analysis [240], Analysis of additives in PP compounds via direct thermal desorption ammonia CI-MS has been described [269] and direct mass spectrometric oligomer analysis has been reported [21],... 

With the advent of high efficiency columns, HPSEC has become an indispensable chracterization and problem solving tool for oligomer analysis as will be shown in the following examples (121,128,129)... 

Connected to the cleaning techniques is the characterization of aqueous-phase oligomers and polymers and surface group analysis. Oligomer analysis is discussed in Section 11.2.5. Here, a brief mention of particle surface characterization techniques will be given because these are generally used in combination with the above-mentioned latex cleaning techniques. 

On the other hand, two promising techniques that are rapidly gaining interest, namely isotachophoresis (ITP) and HPLC, are less common in standard polymer characterization. Recently, FTP has been shown to be a powerful tool in oligomer analysis, and at present HPLC is being developed for that purpose. Therefore, the latter more specific methods will be briefly discussed first. 

Saito, J., Waki, H., Teramae, N., and Tanaka, S., Application of field desorption mass spectrometry to polymer and oligomer analysis. Progress Org. Coatings, 15, 311,1988. 

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