Analytical Pyrolysis Of Synthetic Organic Polymers by Serban C. Moldoveanu

By Serban C. Moldoveanu

Analytical Pyrolysis of artificial natural Polymers is a follow-up to Analytical Pyrolysis of ordinary natural Polymers, that's quantity 20 of the sequence. the main target of the publication is on sensible purposes of analytical pyrolysis in man made natural polymer id and characterization.

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Similar to the case for polyurethanes, other polymers with low DP and terminal amino groups can be used to form polyureas. In these cases, the polyurethane or the polyurea can be viewed as a copolymer. 20 Overview of organic synthetic macromolecules - Polymers containing heterocycles in the backbone include a variety of compounds, as the diversity of heterocyclic molecules is quite large. The polymers from this class may contain groups derived from furan, thiophene, pyrrole, isoindole, benzimidazole, benzothiazole, benzoxazole, quinoxaline, etc.

Molecular weight distribution also can be measured using ultracentrifugation, or more commonly size exclusion chromatography (SEC). Size exclusion chromatography is also known as gel filtration when it is used to separate molecules in aqueous systems, or gel permeation (GPC) when it is used to separate organic polymers in non-aqueous systems. The separation in SEC is similar to that in HPLC, and for a specific polymer it generates a chromatographic peak. A column packed with a porous medium is used for the separation.

5 POLYMER BLENDS, COMPOSITE MATERIALS, AND ADDITIVES FOR POLYMERS - General aspects It is common in practice to have certain homopolymers or even copolymers mixed together, which modifies some of their characteristics and makes them more suitable for 22 Overview of organic synthetic macromolecules applications. This can be done by mechanically mixing two or more polymers to form a blend. In a blend, individual macromolecules of the components do not have chemical bonds. However, intermolecular interactions are always present, and physical properties of blends are sometimes quite different from that of individual polymers.

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