Synthesis of Brominated Polyethylene by Copolymerization of Ethylene with ω–bromoalkene Catalyzed by a Metallocene and Methylaluminoxane System

Abstract

The metallocene-catalyzed copolymerization of ethylene and 11–bromo–1–undecene was carried out to synthesize brominated polyethylene (PE). A modified methylaluminoxane (MMAO) solution was used as a cocatalyst and rac–Et(H4Ind)2ZrCl2 as a catalyst. The copolymerization showed a high activity and afforded the copolymer with a 11-bromo-1-undecene incorporation ranging from 1.0 to 4.3 mol%. When using a dried methylaluminoxane (dMAO) as a cocatalyst, the incorporation ratio of 11-bromo-1-undecene increased remarkably to 25.2 mol%. It was demonstrated that the type of MAO used as a cocatalyst affects the composition of the ethylene/11-bromo-1-undecene copolymer without changing the structure of the catalytic complex.

Flame retardant phosphonate-functionalised polyethylenes

“…The comonomer incorporation level determined from 1 H NMR spectroscopy is in the range of 2.44–6.10 mol% which is higher than those reported in the literature. 17 a ,18,20 The signal at 3.49 ppm corresponds to the methylene protons adjacent to the bromide group indicating the successful incorporation of 11-Br (Fig. S5†).…”

Development and characterization of polyethylene and deuterated polyethylene targets for nuclear physics experiments

“…Absorption spectrum of the polyethylene target shows five peaks at wave numbers ν = 720 cm −1 , 1463 cm −1 , 1473 cm −1 , 2860 cm −1 and 2900 cm −1 respectively (see figure 7), these are related to the vibrations of C-H bond. The peak at ν = 720 cm −1 is due to the rocking of CH 2 bond [22]. The peaks at 1463 cm −1 and 1473 cm −1 are due to the bending of C-H bonds whereas 2850 cm −1 and 2900 cm −1 are due to the stretching of C-H bonds respectively [22].…”

“…The peak at ν = 720 cm −1 is due to the rocking of CH 2 bond [22]. The peaks at 1463 cm −1 and 1473 cm −1 are due to the bending of C-H bonds whereas 2850 cm −1 and 2900 cm −1 are due to the stretching of C-H bonds respectively [22]. Infrared absorption peaks positions shifted towards lower wave numbers when polyethylene target was replaced with a deuterated polyethylene target.…”

Flame Retardant Polymer Nanocomposites: An Overview

“…For example, the polymerization of brominated monomers like 2, 4, and 6‐tribromophenyl methacrylate yield flame retardant polymers with an increase in limiting oxygen index. [ 9 ] Some of the more important flame retardant additives, monomers, and tools used to develop flame retardancy are listed in Table 1 .…”