Selectivity of shear rate on chains in polymer combination reaction

Abstract

ABSTRACT:The combination reaction of linear low density polyethylene initiated by Dicumyl peroxide at elevated temperature was investigated under different steady shear rates. Gel-permeation chromatography was used to determine the molecular weight distributions, and time-molecular weight superposition method was used to analyze the viscosity curves. The results showed that lower (or higher) shear rate increased the reaction possibility of shorter (or longer) chains.

A Study on Melt Grafting of N-Halamine Moieties onto Polyethylene and Their Antibacterial Activities

“…Peroxide treatment has been used widely to improve the mechanical and heat performance of PE. 16 Focuses were mainly put on final products which are crosslinked PE. As mentioned before, radical reactions of PE in the melt usually lead to a significant amount of polymer chain combination.…”

“…Peroxide treatment has been used widely to improve the mechanical and heat performance of PE . Focuses were mainly put on final products which are cross-linked PE.…”

Control on the topological structure of polyolefin elastomer by reactive processing

“…Although it has been shown that flow field will affect the formation of LCB in polyethylene [2], it is impossible to control the molecular structure and LCB's content only by coupling reaction at present. On the other hand, chain scission can be regarded as a reversible reaction, depending on the recombination rate and the speed of the fractured chain moving out of the capture radius, which is very sensitive to the imposed shear flow field.…”