Polyolefins, analysis Fluorescence

UV stabilisers can be determined by direct analysis of polyolefins and polyvinyl chloride (PVC) (i.e., without solvent extraction) using the Perkin Elmer model LS-50 luminescence spectrometer (L255-0105) fitted with a front surface accessory. The relation between fluorescence emission and stabiliser content was found to be linear over the range obtained for both natural and extruded polymer samples [23]. 

Fluorescence characteristics of some common polymers have been listed [505]. Fluorescence analysis of polyolefins has been the subject of much controversy but is generally now considered to be associated with the presence of low levels of cyclic a, -unsaturated carbonyl compounds of the enone or enal type [514]. Fluorescence and phosphorescence excitation and emission of LLDPE, HDPE and mPE were reported [515]. 

U V fluorescent sulfur detection and chemiluminescent nitrogen methods have been developed for total sulfur only, nitrogen only or simultaneous sul-fur/nitrogen analysis. These systems provide quick automated analysis to estimate the type and amount of sulfur and nitrogen-containing additives present in a polyolefin sample, i.e. slip agents, antistatics. 

---