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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



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.mame201300005-gra-0001