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Optimization of additive packages for processing and long‐term thermal stabilization of film grade high‐density polyethelene
Author(s) -
Parrondo Aitor,
Allen Norman S.,
Edge Michele,
Liauw Christopher M.,
Fontán Eusebio
Publication year - 2002
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.10351
Subject(s) - melt flow index , materials science , zinc stearate , plastics extrusion , stearate , composite material , response surface methodology , thermal , low density polyethylene , high density polyethylene , polyethylene , polymer , chemistry , chromatography , organic chemistry , thermodynamics , raw material , physics , copolymer
Analysis and optimization of the simultaneous effects within different additive packages for stabilization during melt processing and long‐term thermal stabilization of high‐density polyethylene were carried out by using a carefully constructed statistical experimental design involving response surface methodology (RSM). The packages consisted of blends of phenolic antioxidants, phosphites, and zinc stearate. The degree of melt processing stabilization was assessed by using melt flow rate (MFR) and yellowness index (YI) measurements conducted on samples that had varying degrees of processing history imposed by varying the number of passes through a twin‐screw extruder. The long‐term thermal stabilization was assessed by YI measurement after oven aging at 110°C. The RSM approach utilized in this study enabled the contribtion of each additive to the stabilization and interactions between the additives to be observed. Furthermore, the concentration and ratio of each additive could be optimized.