Abstract
A reversed-phase high-performance liquid chromatographic (HPLC) method utilizing a photodiode-array detector was developed that is capable of identifying and quantifying Cyasorb UV 1084, a UV light stabilizer, and some of its UV and thermal decomposition products in low-density polyethylene (LDPE) resins in the presence of common antioxidants and UV stabilizers. Isopropanol extracts Cyasorb UV 1084 from the LDPE concentrate at greater than 95% efficiency. The overall precision of the method is very good, the relative standard deviation being less than 4%. This HPLC method was used to determine Cyasorb UV 1084 in concentrates and manufactured films. It was found that the level of Cyasorb UV 1084 in concentrates was as expected and had not degraded. However, lower than specified levels of Cyasorb UV 1084 were found in the manufactured film and clear evidence for thermal decomposition products was observed. This loss of Cyasorb UV 1084 apparently caused a shorter film life.
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