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SynopsisA combined (chemical and infrared (IR) spectrophotometric) method is discussed for the simultaneous determination of concentrations of carboxyl (A), ketone (K), and ester (E) groups formed in the oxidation of polyethylene (PE). The IR absorptivities of these functional groups were determined by using model compounds [stearic acid, stearone, poly-(1,4-butylene sebacate)]. The integral absorption of the C=O band of polymer samples which contained several 0x0 groups of different types was found to be additive. This method was applied to the determination of the carboxyl, ester, and ketone content of samples oxidized at different oxygen pressures.

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In this work three different techniques were used to determine the crystallinity of polyethylene. After different pretreatment HDPE, LLDPE, and LDPE samples were investigated by density measurements, differential scanning calorimetry, and Raman spectroscopy. The results were compared and relationships were estabilished between the values measured by the different methods. ZUSAMMENFASSUNG Im Rahmen dieser Arbeit wurden drei verschiedene MeRmethoden fur die Bestimmung der Kristallinitat von Polyethylen angewandt. HDPE, LLDPE und LDPE-Proben wurdennach verschiedener Vorbehandlungdurch Dichtebestimmung, DSC und Raman-Spektroskopie untersucht. Die mit verschiedenen Methoden gewonnenen Resultate wurden verglichen, und Korrelationen wurden bestimmt. 0 1991 Huthig & Wepf Verlag, Basel CCC OOO3-3146/91/$03.00