Effect of UV treatment on the dielectric strength of BOPP capacitor film
The effect of UV treatment on dielectric breakdown strength of metallized biaxially-oriented polypropylene (BOPP) capacitor film was studied. Results from Weibull statistical analysis indicate that an optimal UV exposure level of ~3.4 J/cm2 (200-400 nm) increases the breakdown strength at 1% probability by ~20%. UV spectroscopic analysis indicates that the antioxidant in BOPP was consumed almost entirely. The results suggest that antioxidant remaining in the BOPP after processing may have an unfavorable effect on the breakdown strength of the film
Investigation of low mass oligomers and polymer additives from plastics. Part II: Application to polyolefin soxhlet extracts
Polyolefin Soxhlet extracts have been investigated by capillary SFC using flame ionization detection. Separation and detection of every polymer additive (antioxidants, antistatic agents, etc.) present in the plastic were possible, sometimes in a single CSFC run. Identification of coextracted low mass oligomers and certain of the alteration products of Irganox 1010 was confirmed by GC-MS. New methods are presented for the determination of reacted and remaining calcium stearate, used in plastics both as a stabilizer and a lubricant.
Analysis of stabilizers in polymer substrates
A general overview of the analytical techniques available to qualitate and quantitate the additive stabilizers in polyolefins is presented. A review of several sample preparation techniques, including polymer dissolution, supercritical fluid extraction and microwave dissolution is presented. This is followed by a general overview of the various chromatographic techniques, ranging from thin layer chromatography to supercritical fluid chromatography, which may be used for stabilizer analysis. Several spectroscopic analytical techniques that are used in the research environment are discussed, as well as techniques that may be used in the production environment for process control. Some of the practical considerations faced by analytical chemists are also described.