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Correlation Between Reactive Modification Conditions and Degree of Long‐Chain Branching in Chemically Modified Linear Low Density Polyethylene Using Response Surface Experimental Design
Author(s) -
Golriz Mahdi,
Khonakdar Hossein Ali,
Morshedian Jalil,
Abedini Hossein,
Jafari Seyed Hassan,
Lederer Albena,
Wagenknecht Udo
Publication year - 2014
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201300005
Subject(s) - branching (polymer chemistry) , materials science , polyethylene , degree (music) , response surface methodology , surface modification , peroxide , mixing (physics) , polymer chemistry , thermodynamics , biological system , chemical engineering , composite material , chromatography , organic chemistry , chemistry , physics , biology , quantum mechanics , acoustics , engineering
Changes induced in the molecular architecture of linear low‐density polyethylene during early stages of peroxide modification in a microcompounder are monitored by means of size exclusion chromatography and dynamic shear oscillatory measurements as a function of peroxide concentration, mixing temperature and resident time. By the use of a response surface method and according to a box Behnken statistical design, various contour plots are constructed to establish correlations between the processing parameters and degree of long‐chain branching. All investigated process parameters are shown to have a significant effect on the degree of long‐chain branching, the order of significance being concentration > temperature > mixing time. The interactive effects of these factors are determined.