J.‐F. Revol

McGill University

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R. H. Marchessault

McGill University

R. H. Marchessault

McGill University

H. Chanzy

Centre National de la Recherche Scientifique

R. St. John Manley

McGill University

H. Chanzy

Centre National de la Recherche Scientifique

D. A. I. Goring

University of Toronto

D. H. Ryan

McGill University

Louise Raymond

University of Calgary

Julie Giasson

McGill University

William J. Orts

Agricultural Research Service

Cooperative Institutions

McGill University

Centre National de la Recherche Scientifique

Université de Montréal

Centre de Recherches sur les Macromolécules Végétales

National Research Council Canada

European Synchrotron Radiation Facility

Université Grenoble Alpes

Polytechnique Montréal

University of Massachusetts Amherst

Université Joseph Fourier

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New Insights into Fibre Swelling, Interfibre Bonding and Wet Strength

R. H. Marchessault Martine Dubé Jean-Emmanuel Pierré J.‐F. Revol

The various modes in which ordinary and modified cellulose fibres and surface modified cellulose microfibrils can interact with water are reviewed. The hydrogel state of fibres can be extruded and dried to form a continuous oriented strand: ‘one dimensional paper’. A colloidal suspension of surface modified cellulose microfibrils can be converted into a paracrystalline gel which exhibits birefringent domains and responds to extrusion through a cylindrical orifice to yield a continuous fibre whose density and x-ray diagram are characteristic of cellulose: ‘reconstituted native cellulose’. The mechanical properties of these two novel materials are reported. The mechanism of wet strength development in ‘one-dimensional paper’ which had been encapsulated with nascent polyethylene was studied. The polyethylene was confined to the exterior of the substrate and while it does not prevent fibre wetting and swelling the rate of wetting is considerably slowed. As a result, disruption of interfibre bonds is incomplete.

10.15376/frc.1977.1.795

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High-resolution electron microscopy of single crystals of poly-β-hydroxybutyrate (PHB) and copolymers

HAL (Le Centre pour la Communication Scientifique Directe) (1988)

Yves Deslandes William J. Orts P. R. Sundararajan R. H. Marchessault J.‐F. Revol

Poly-3-hydroxybutyrate

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High-resolution electron images of linear polymers

Proceedings annual meeting Electron Microscopy Society of America (1987)

J.‐F. Revol H. Chanzy

Polymer crystals are damaged and changed to an amorphous state by a relatively small electron irradiation dose. For this reason, lattice imaging of polymer crystals was restricted until recently to ones that are relatively resistant to irradiation. To overcome irradiation damage, R.M. Glaeser proposed the use of a low-dose imaging technique followed by averaging techniques to produce statistically well defined information. This pioneering technique was then first applied by Unwin and Henderson who obtained a two dimensional molecular structure of the purple membrane protein, bacteriorhodopsin, at 0.7 nm resolution. For the usual linear polymer crystals, however, no structural information is available at this level and a better resolution must be reached to have access to molecular features. The following is a brief description of low-dose imaging at molecular dimensions of the two most abundant naturally occurring polymers in the world: cellulose and chitin, and of two common synthetic polymers: polyethylene (PE) and polytetrafluoro-ethylene (PTFE).

radiation damage

10.1017/s0424820100127086

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Potato Starch Encapsulation with Polyethylene. I. Catalysis and Polymerization

Starch - Stärke (1973)

H. Chanzy J.‐F. Revol

Abstract A process for the encapsulation of individual potato starch granules with polyethylene is described. It involves a thorough dessication of starch followed by a generation of a fine precipitate of VCl 3 which adsorbs on the surface of each granule. When this deposit of VCl 3 is activated by Al(C 2 H 5 ) 3 , the surface of the granule becomes active toward polymerization of ethylene. An encapsulation of each individual granule by polyethylene is obtained when the polymerization occurs in a non solvent. The growth of the encapsulation shell is studied as function of time, temperature, catalyst concentration and moisture content of the starch samples.

Granule (geology)

Encapsulation

10.1002/star.19730250406

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Electron microscope investigation on nascent polyethylene

Journal of Crystal Growth (1980)

J.‐F. Revol W. H. Luk R. H. Marchessault

10.1016/0022-0248(80)90213-4

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Citations (9)

Relationship between ball milling and the susceptibility of wood to digestion by cellulase