Polyethylene thermolysis

N. Horvat and E. T. T. Ng, Tertiary polymer recycling stndy of polyethylene thermolysis as a first step to synthetic diesel fuel. Fuel, 78, 459-470 (1999). 

TERTIARY RECYCLING OF POLYETHYLENE MECHANISM OF LIQUID PRODUCTION FROM POLYETHYLENE BY THERMOLYSIS/ REACTIVE DISTILLATION... 

Other additives such as waxes and polyethylene glycols melt at relatively low tem-peratnres and vaporize over a more narrow temperatnre range. Oxidation of the binder canses the temperature to increase more rapidly. For the thermolysis of polyethylene glycol (PEG) in air, decomposition occnrs by the mechanism of chain scission and oxidative degradation. 

Tethered SWCNTs and interconnections between individual SWCNTs using a,to-dinitrenes as the molecular linker (Scheme 1.20) were reported the first time in 2003 by Holzinger et al. [157]. The bisnitrenes were derived from thermolysis of polyethylene glycol) PEG 600 bisazidocarbonate the covalent linkage was characterized by SEM studies, XPS, X-ray diffractograms and Raman spectra [157]. 

R. C. Mordi, R. Fields and J. Dwyer Thermolysis of Low-Density Polyethylene Catalyzed by Zeolites J. Anal. Appl. Pyrol, 29, 45 (1994). 

The weakened initiation effect of ROO-CHD, after accumulation of the products of their thermolysis which act as retarders, was shown in the oxidation of slowly oxidized substrates, e. g. cetane (a model of polyethylene) and atactic polypropylene94, where their accumulation is demonstrated very impressively. 

In this work we report on the synthesis of well-formed cubic cerium oxide nanoparticles (3.3-4.9 nm) immobilized in a polyethylene matrix. Preparation of the CeO2/polyethylene material was carried out via the thermolysis of cerium precursors in heated polymer-oil melt. A benefit of this method is that the particles are enclosed in the polymer matrix immediately upon their formation, hence, they do not conglomerate. 

The material containing CeO2 nanoparticles in the low density polyethylene (LDPE) matrix was prepared by the thermolysis of Ce(NO3)3, (NH4)2Ce(NO3)6, and (Et4N)2Ce(NO3)6 in the polyethylene melt in a mineral oil [3-5]. The synthesis was performed in argon flow at 290-300 °C. The argon flow provided rapid removal of gaseous decomposition products and solvent from the reaction vessel. After cooling down to the room temperature, the product was extracted from the reaction vessel and rinsed with benzene. Then, the product was dried in vacuum and stored in air for further operations. 

Polyester fibers are composed of linear chains of polyethylene terephthalate (PET), which produces benzene, benzoic acid, biphenyl, and vinyl terephthalate on pyrolysis. Acrylic fibers comprise chains made up of acrylonitrile units, usually copolymerized with less than 15% by weight of other monomers, e.g., methyl acrylate, methyl methacrylate, or vinylpyrrolidone. Thermolysis results in the formation of acrylonitrile monomer, dimers, and trimers with a small amount of the copolymer or its pyrolysis product. In this case, the acrylic is Orion 28, which contains methyl vinyl pyridine as comonomer. Residual dimethyl formamide solvent from the manufacturing process is also found in the pyrolysis products. Cotton, which is almost pure cellulose, comprises chains of glucose units. The pyrolysis products of cellulose, identified by GC/MS, include carbonyl compounds, acids, methyl esters, furans, pyrans, anhydrosugars, and hydrocarbons. The major pyrolysis products are levoglucosan (1,6-anhydro-B-D-glucopyranose) and substituted furans. 

Figure 12.1.37. Effectofviscosityonmolecularweight Figure 12.1.38. Yield of condensation products de-of polyethylene wax obtained by thermolysis in the pending on solvent. [Adapted, by permission, from J...

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