Papers by Claude Daneault
Bioresources, Sep 16, 2008
The purpose of this study is to develop an analytical method to quantify the nitrogen present at ... more The purpose of this study is to develop an analytical method to quantify the nitrogen present at the surface of paper by using X-ray photoelectronic spectroscopy (XPS). A sample of softwood thermomechanical pulp (TMP) was treated with a cationic starch containing primary amines, while another one was treated with a cationic polymer containing quaternary amines. We also grafted monomers containing a quaternary amine to the fiber. Sheets were prepared and analyzed by XPS. The technique used allowed us to identify the type of amine and to give a semi-quantitative evaluation.
Comparison between peroxide prebleaching and postbleaching sequence of ONP with alternative chemicals : chances and limitations : Use of various other chemicals can increase brightness and reduce effluent loads
Pulp and Paper Canada Ontario, Sep 1, 1997
ABSTRACT
The Use of Sodium Chlorite in Post-Oxidation of TEMPO-Oxidized Pulp: Effect on Pulp Characteristics and Nanocellulose Yield
Http Dx Doi Org 10 1080 02773813 2011 624666, Mar 5, 2012
ABSTRACT This article may be used for research, teaching, and private study purposes. Any substan... more ABSTRACT This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.
Thermo-oxidative behaviour of water-borne ink binders in the presence of monovalent metal ion
Polymer Degradation and Stability, 1996
ABSTRACT
Mill system closure and trash catching porous fillers in papermaking
Tappi Journal, 2003
This study evaluates the possible use of porous sodium aluminosilicate (zeolite) as a wet end fil... more This study evaluates the possible use of porous sodium aluminosilicate (zeolite) as a wet end filler and as a white water clarifier in dissolved air flotation. Micro flocs generated by highly porous sodium aluminosilicates replacing magnesium silicate in the wet end gave better ...
Use of zeolite as a microparticle system in the clarification of deinking plant white water by dissolved air flotation
Cellulose Chemistry and Technology, 2002
ABSTRACT
The effect of grafting on the paper properties of wood pulp
Tappi Journal, 1988
Investigation on using two types of sonoreactors for Kraft lignin fractionation
2014 Ieee International Ultrasonics Symposium, Sep 1, 2014
The xanthate method of grafting. 12. Effect of operating conditions on the grafting of vinyl monomers onto wood pulp
J Appl Polym Sci, 1989
The Mechanical Properties of Wood Fiber-reinforced Polymethylmethacrylate
Int J Polym Mater, 1989
Use of Grafted Hardwood Pulps in Thermoplastic Composites. V. Evaluation of Paper Sheet Properties
Http Dx Doi Org 10 1080 03602558608070080, Dec 13, 2006
... In the case of birch grafted pulps, Tables 4 and 5 show a slightly higher Page 6. 132 KOKTA, ... more ... In the case of birch grafted pulps, Tables 4 and 5 show a slightly higher Page 6. 132 KOKTA, DANEAULT, AND SEAN 5.68 - Y I I-5.52-Y p 5.36-3 a 5.20-z $ 5.04-8 A 4.88-4.72 , 5-64, TEMPERATURE:204'C PRESSURE: lOOkg/cm.crn 4 5.30 - 5.20 - ? ...
Effect of fiber treatment on mechanical properties of polypropylene‐wood fiber composites
Die Makromolekulare Chemie Macromolecular Symposia, May 1, 1989
Treatment of waste printed papers with surface active polymeric compositions to produce brighter pulp
ABSTRACT
Polypropylene-Wood Fiber Composites: Effect of Fiber Treatment on Mechanical Properties
Http Dx Doi Org 10 1080 00914038908031503, Sep 24, 2006
Use of Wood Flour as Filler in Polypropylene: Studies on Mechanical Properties
Polymer Plastics Technology and Engineering, Apr 1, 1989
Page 1. P0LYM.-PLAST. TECHNOL . ENG., 28(3). 247-259 (1989) USE OF WOOD FLOUR AS FILLER IN POLYPR... more Page 1. P0LYM.-PLAST. TECHNOL . ENG., 28(3). 247-259 (1989) USE OF WOOD FLOUR AS FILLER IN POLYPROPYLENE: STUDIES ON MECHANICAL PROPERTIES BV KOKTA. R . G . RAJ. and C . DANEAULT Centre de ...
POM-assisted electrochemical delignification and bleaching of chemical pulp
Cellulose Chemistry and Technology, 2001
A polyoxometalate-catalyzed electrochemical process has shown good selectivity in delignifying pu... more A polyoxometalate-catalyzed electrochemical process has shown good selectivity in delignifying pulp. This breakthrough in redox catalysis shows promise for the development of a new environmentally benign technology for pulp bleaching. The electrochemical ...
Relaxation phenomenon effect of adsorbed polymer at fibre/water interfaces on the pulp fibre retention process
Appita Journal, Apr 1, 2009
ABSTRACT Polyelectrolytes have a major impact on the retention of fines and fillers in the paper ... more ABSTRACT Polyelectrolytes have a major impact on the retention of fines and fillers in the paper web during papermaking. To improve sheet quality, it is critical to optimise the retention process. We have examined the effect of the polymer relaxation phenomenon at fibre/water interfaces on the retention efficiency. Retention experiments were carried out with different retention aids at various addition rates and shearing conditions. Results showed that the polymer relaxation phenomenon occurred in unsaturated polymer layers with and without shear. The retention efficiency was inversely proportional to polymer relaxation. The shear level produced by the stirrer strongly affected the retention process. It was also found that the relaxation process was dependent on the polymer dosage as polymer relaxation amplitudes were decreased with polymer dosages. Results also revealed that the retention reduction caused by polymer relaxation improved sheet formation.
Brightening Ultra-High-Yield Hardwood Pulps With Hydrogen Peroxide and Sodium Hydrosulfite
Tappi Technical Association of the Pulp and Paper Industry Journal, 1986
Use of modified silica nanoparticle for fixation andelimination of colloidal and dissolved substancesfrom white water
Nordic Pulp and Paper Research Journal, 2006
ABSTRACT The objective of this study was to understand how modified cationic silica, obtained by ... more ABSTRACT The objective of this study was to understand how modified cationic silica, obtained by adsorption of cationic polyelectrolyte or by grafting, traps dissolved and colloidal substances of the wood and eliminates them from white water systems. Polygalacturonic acid, considered as a representative model of dissolved and colloidal substances in bleached thermomechanical pulp was used in this study. The pre-adsorp-tion of cationic polyelectrolyte as well as the adsorption of this anionic trash on the modified silica surface were studied at pH 4.5 and 6.5 and various NaCl concentrations by isotherm adsorption measurements. Zeta potential measurements were also used to estimate the potential of the modified particles. We first showed that the adsorption of poly-DADMAC on the silica surface increased with increasing ionic strength, while the zeta potential went through an optimum. Adsorption of the polyga-lacturonic acid on the silica surface covered by poly-DADMAC was treated as an adsorption on a soft surface, where the inter-action is viewed as being purely electrostatic, varying according to the zeta potential of cationic silica but independent of the amount of cationic polyelectrolyte pre-adsorbed. The adsorption of polygalacturonic acid on grafted silica surface was treated as an adsorption on a hard charged surface. This last interaction, which is a case of screening-enhanced adsorption, did not vary according to the zeta potential of cationic silica and was domi-nated by a non-electrostatic interaction at high ionic strength. During pulp production and subsequent treatments, numerous dissolved and colloidal substances (DCS) are released in the process water. The origin of these substan-ces, their characteristics, as well as their behavior varies tremendously according to the nature and the type of pulp used and also to the conditions of production. For virgin pulp, these substances are produced primarily from various wood components, while their composition is sig-nificantly different in recycled pulp. Because of environ-mental constraints, the paper industry is required to redu-ce their fresh water consumption. However, closing the water circulation system of a paper machine and possibly converting it into a totally effluent-free papermaking pro-cess results in a buildup of detrimental substances in the white water. The system then becomes more sensitive to disturbances and variations in the process. This implies that the white water has to be continuously cleaned
Electrochemical Delihnification of a Softwood Kraft Pulp with In-situ Regeneration of a Catalyst
Paperi Ja Puu, 1999
Uploads
Papers by Claude Daneault