Thermogravimetric/Mass spectrometric (TG/MS) characterization of toner particles from photocopied wastepaper and the impact of these features on flotation deinking

Download item | Update item information
Publication Type Journal Article
School or College College of Mines & Earth Sciences
Department Metallurgical Engineering
Creator Miller, Jan D.
Other Author Nie, Xiansheng
Title Thermogravimetric/Mass spectrometric (TG/MS) characterization of toner particles from photocopied wastepaper and the impact of these features on flotation deinking
Date 1995
Description Flotation deinking of photocopies from office waste is known to be much more difficult than the flotation deinking of newsprint. In this regard, research has been undertaken to better understand the phenomena which account for the poor efficiency in the flotation deinking of such office waste. During the photocopying process, toner particles, mainly consisting of styrene-acrylate copolymer (>85%), are photoelectrically attached to the cellulose fiber and heated to bond the toner particles to the paper. Even with the short time of exposure to heat, light, and oxygen, it is expected that surface styrene groups undergo oxidation and polymerization with the subsequent formation of peroxide bonds. Thermogravimetry/mass spectrometry (TG/MS) results show that the decomposition temperatures of monomer, dimer and trimer styrenes and styrene-acrylate present in the toner particles have been increased by about 10 to 30 °C after photocopying, and that their decomposition activation energies have been increased by about 7 to 20 kcal/mol. Correspondingly, it was found that volatile release was diminished, that thermal stability of toner residue increased slightly, and that the phase change (softening) around 72 °C, which is below the printing temperature, disappeared. On the other hand, the acrylate component of the toner which contains the oxygen-functional groups (-OH and -O-), was found to be relatively more stable during the photocopying process and this component of the toner was not affected. It appears that the strong bond of the toner particles with the cellulose fibers, the polymerization (fusion), and the oxidation of the styrene, which creates a greater polarity at the toner particle surface, accounts for the difficulty in making more efficient flotation deinking separations in the recycle of office waste containing photocopies.
Type Text
Publisher Technical Association of the Pulp and Paper Industry
First Page 179
Last Page 201
Subject Photocopied paper; Recycling; Deinking; Flotation; Thermal decomposition; Thermogravimetry; Mass spectrometry; Differential scanning calorimeter; Toner particles
Subject LCSH Flotation; Separation (Technology); Waste paper
Language eng
Bibliographic Citation Miller, J. D., & Nie, X. (1995). Thermogravimetric/Mass spectrometric (TG/MS) characterization of toner particles from photocopied wastepaper and the impact of these features on flotation deinking. Tappi Proceedings, 179-201.
Format Medium application/pdf
Format Extent 1,061,910 Bytes
Identifier ir-main,4371
ARK ark:/87278/s6377t7k
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2012-06-13
ID 705989
Reference URL https://collections.lib.utah.edu/ark:/87278/s6377t7k
Back to Search Results