Cross-linking agents, analysis

FAB-MS has been used for the analysis of lubricant additives, thermally labile or involatile organic compounds, such as macromolecules and dyes, and inorganic compounds. Cationic dyes and dye intermediates, which are typically acid salts, readily yield preformed ions in the FAB matrix solution. They are also very difficult to address by other MS ionisation methods due to their involatility. Lay and Chang [85] used positive ion FAB to characterise a mixture of amine and ketimine cross-linking agents for polymer coatings. Bentz et al. 

The apparent structural parameters of the three-dimensional networks are presented in Table 3. Cross-link density analysis showed that vulcanizates contained both ionic bonds and covalent bonds. As we expected, addition of co-agents led to an increase of cross-Unk density (vj) of vulcanizates. The highest value was obtained for the sample containing acrylic acid and zinc oxide (7.55 10 mol/cm ) in contrary to the sample without co-agents (4.77 10 mol/ cm ). Thus, also the cross-link efficiency increased. It was foimd that non-covalent bonds are formed in the network structure and then break under the influence of ammonia vapoms. It reveals in a decrease of cross-link density measured on the basis of equilibrium swelling in toluene and ammonia vapours (vt+a)-... 

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