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
Organic Structural Spectroscopy
Preface. 1. Introduction. I. NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY. 2. Introduction and Experimental Methods. 3. The Chemical Shift. 4. The Coupling Constant. 5. Further Topics in One-Dimensional NMR. 6. Two-Dimensional NMR. II. VIBRATIONAL SPECTROSCOPY. 7. Introduction and Experimental Methods. 8. Group Frequencies: Infrared and Raman. 9. Structure Analysis. III. ELECTRONIC ABSORPTION AND CHIROPTICAL SPECTROSCOPY. 10. Introduction and Experimental Methods. 11. UV-Vis, CD, and ORD. 12. Structure Analysis. IV. MASS SPECTROMETRY. 13. Ionization and Mass Analysis. 14.Fragmentation and Ion Chemistry. 15. Chemical Analysis. Appendix to Part IV. V. INTEGRATED PROBLEMS. 16. Integrated Problems. 15. Index.
Compatibility of HALS-nitroxides with polyolefins
Abstract The solubilities and diffusion coefficients of some nitroxy derivatives of hindered amine light stabilizers (HALS-NO) have been measured in polypropylene (PP), high density polyethylene (HDPE), low density PE (LDPE) and linear low density PE (L-LDPE). The results are compared with the values for the corresponding HALS and it is shown that nitroxides are always less soluble than the parent amines. Quantitative measurement of non-extractable stabilizer indicates that 1–2% of the stabilizer is bonded to the polymer chains after thermal aging (60–80°C). The diffusion behaviour of nitroxides is strongly dependent on the polyolefin type and differences of up to two orders of magnitude have been observed between PP and LDPE.