0 1 of dibutyltin dilaurate dbtdl as catalyst the reactants are melted at 80 c and 0 1 by weight of the appropriate catalyst is added to the 4 hyrdoxy tempo mixed on a vortex mixer and reheated for about 1 minute the two liquids are then poured together mixed on a vortex mixer and the reaction allowed to proceed to completion at 130 c an aliquot is used for the analysis and spectra are collected on a nicolet magna 750 ft ir spectrometer via transmission the samples are prepared as capillary films pressed between salts the salts are then placed in a heatable cell holder connected to a digital temperature controller resolution is set at 4 cm u2212 1 and 64 scans are co added to enhance the signal to noise s n ratio the spectra are processed with triangular apodization the resin used is a low density polyethylene 2 4 dg min melt index mi 0 9200 g cc density the peroxide is soaked into pellets of polymer according to the following procedure heat the ldpe pellets in a glass jar at 60 c for 2 hours preheated dicupr peroxide dicumyl peroxide dcp separately to 60 c i e above its melting point of 40 c add preheated peroxide using a syringe and tumble blend for 30 minutes at room temperature mix the entire contents of the jar in a brabender mixing bowl at 125 c and 30 rpm for 10 minutes 1 a brabender mixing bowl is used at 30 rpm to make 40 grams of each formulation 3 the ldpe containing peroxide is added and fluxed for 3 minutes.