Abstract
AbstractThe effects of individual components in a vitamin E based antioxidant formulation (CF‐120) on off‐odor release, melt flow property and yellow color property of HDPE resin pellets were investigated using a three‐phase study. The formulation consists of vitamin E, glycerol, polyethylene glycol‐400 (PEG‐400), and glyceryl monocaprylate/caprate (GMC). The resin pellets were extruded from HDPE resin powder using a laboratory scale single screw extruder. Off‐odor release from the resin pellets was evaluated using a sensory panel and GC/MS analysis. Melt flow indices and yellowness indices of the resin pellets were also measured. Screening experiment (Phase I) showed that GMC greatly contributed to off‐odor and MFI reduction; vitamin E greatly contributed to yellow color formation. Factorial experiment (Phase II) confirmed that GMC was the major off‐odor contributor. Response surface experiment (Phase III) showed that yellowness index and odor score reasonably correlated to vitamin E and GMC concentrations; MFI and nonanal concentration did not correlate well with vitamin E and GMC concentrations. The identification of octanoic acid by GC/MS from HDPE resin pellets suggested that possible thermal/mechanical degradation of GMC might occur in extrusion. The results are useful for designing a better vitamin E formulation for reducing the off‐odor, without significantly enhancing yellow color formation.
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