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Papers by Sylvain Galland

Research paper thumbnail of Microstructure and micromechanical studies of injection moulded Chemically Modified Wood / Poly(lactic acid) Composites

Conventional wood plastic composites (WPCs) in general combine wood residuals with thermoplastics... more Conventional wood plastic composites (WPCs) in general combine wood residuals with thermoplastics such as polyethylene and polypropylene. The basic idea in this work is to replace these olefin pl ...

Research paper thumbnail of The Royal Society of Cellulose nano fi bers decorated with magnetic nanoparticles – synthesis , structure and use in magnetized high toughness membranes for a prototype loudspeaker †

Research paper thumbnail of Influence of processing routes on morphology and low strain stiffness of polymer/nanofibrillated cellulose composites

Plastics Rubber and Composites

The morphology of polymer/nanofibrillated cellulose (NFC) composite sheets produced using differe... more The morphology of polymer/nanofibrillated cellulose (NFC) composite sheets produced using different techniques and its influence on low strain stiffness were assessed by optical and transmission electron microscopy. Solvent processing led to relatively homogeneous NFC dispersions and significant reinforcement of the in-plane Young's modulus. The continuous cellular networks obtained by wet comingling of polylactide powder or latex with NFC also provided efficient and essentially scale independent reinforcement, in spite of the extensive agglomeration of the NFC. However, the irreversible nature of these networks is incompatible with low pressure thermoplastic processing routes such as physical foaming, and while they may be broken up by e.g. extrusion, this led to substantial loss in reinforcement, particularly at temperatures above the glass transition temperature of the matrix, consistent with the observation of isolated low aspect ratio NFC aggregates in the extruded specimens.

Research paper thumbnail of Biocomposites of nanofibrillated cellulose with thermoset resins

Reference EPFL-CONF-207220View record in Web of Science Record created on 2015-04-13, modified on... more Reference EPFL-CONF-207220View record in Web of Science Record created on 2015-04-13, modified on 2016-08-09

Research paper thumbnail of Cellulose network materials - compression molding and magnetic functionalization

All-cellulose composites are commonly prepared using cellulose solvents. In this study, moldable ... more All-cellulose composites are commonly prepared using cellulose solvents. In this study, moldable all-cellulose I wood fiber materials of high cellulose purity (97%) were successfully compression molded. Water is the only processing aid. The material is interesting as a "green" biocomposite for industrial applications. Dissolving wood fiber pulps (Eucalyptus hardwood and conifer softwood) are used and the influence of pulp origin, beating and pressing temperature (20-180 degrees C) on supramolecular cellulose nanostructure is studied by solid state CP/MAS C-13 NMR. Average molar mass is determined by SEC to assess process degradation effects. Mechanical properties are determined in tensile tests. High-density composites were obtained with a Young's modulus of up to 13 GPa. In addition, nanoscale cellulose fibril aggregation was confirmed due to processing, and resulted in a less moisture sensitive material.

Research paper thumbnail of Cellulose nanofibrils decorated by inorganic nanoparticles and used in magnetic nanocomposite membranes of high toughness

Cellulose nanofibrils decorated by inorganic nanoparticles and used in magnetic nanocomposite mem... more Cellulose nanofibrils decorated by inorganic nanoparticles and used in magnetic nanocomposite membranes of high toughness

Research paper thumbnail of Cellulose nanofiber network of high specific surface area provides altered curing reacion and moisture stability in ductile epoxy biocomposites

Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood... more Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood, textiles). Additional developments are suggested by the growing interest for natural fibre-based composite and nanocomposite materials. The motivation is not only in the economic and ecological benefits, but is also related to advantageous properties and characteristics. The objective of this thesis is to provide a better understanding of process-structure-property relationships in some novel cellulose network materials with advanced functionalities, and showing potential large-scale processability. An important result is the favourable combination of mechanical properties observed for network-based cellulose materials.Compression-moulding of cellulose pulp fibres under high pressure (45 MPa) and elevated temperature (120 – 180 oC) provides an environmentally friendly process for preparation of stiff and strong cellulose composite plates. The structure of these materials is characteriz...

Research paper thumbnail of High-temperature copolyamides obtained by the efficient transamidation of crystalline-crystalline polyamide blends

Journal of Applied Polymer Science

High-performance thermoplastic composites based on semiaromatic polyamides are prime candidates f... more High-performance thermoplastic composites based on semiaromatic polyamides are prime candidates for metal replacement in lightweight structural applications. However, the low ductility and toughness of semiaromatic polyamides remain major obstacles to their wider industrial application. In this study, we showed that novel random copolymers were formed by the unexpectedly efficient transamidation during the melt compounding of semicrystalline semiaromatic and aliphatic polyamides. Thus, homogeneous materials with a single glass transition and a high degree of crystalline order were obtained from blends of the semiaromatic poly(hexamethylene terephthalamide-co-isophthalamide) (PA6TI) with poly(hexamethylene adipamide) (PA66) or poly(hexamethylene sebacoamide) (PA610). By contrast, phase segregation and a less efficient transamidation was observed for cocompounded PA6TI and polylaurolactam (PA12). We attributed this to differences in the hydrogen-bonding patterns of the two polyamides. This study opened the way for the preparation of novel high-performance thermoplastic polyamides and composites through simple melt compounding. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44349.

Research paper thumbnail of Elastic properties of cellulose nanopaper

Research paper thumbnail of Compression-moulded and multifunctional cellulose network materials

Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood... more Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood, textiles). Additional developments are suggested by the growing interest for natural fibre-based c ...

Research paper thumbnail of High-Performance Polyamides with Engineered Disorder

Polymer Chemistry

The extraordinary property profiles of many biological materials derive from their hierarchical s... more The extraordinary property profiles of many biological materials derive from their hierarchical structure and control of order and disorder at different length scales. Application of these concepts to the design...

Research paper thumbnail of A non-solvent approach for high-stiffness all-cellulose biocomposites based on pure wood cellulose

Composites Science and Technology, Oct 1, 2010

All-cellulose composites are commonly prepared using cellulose solvents. In this study, moldable ... more All-cellulose composites are commonly prepared using cellulose solvents. In this study, moldable all-cellulose I wood fiber materials of high cellulose purity (97%) were successfully compression molded. Water is the only processing aid. The material is interesting as a “green” ...

Research paper thumbnail of Cellulose nanofiber network of high specific surface area provides altered curing reacion and moisture stability in ductile epoxy biocomposites

Research paper thumbnail of Cellulose nanofibrils decorated by inorganic nanoparticles and used in magnetic nanocomposite membranes of high toughness

Research paper thumbnail of Cellulose network materials - compression molding and magnetic functionalization

Research paper thumbnail of Biocomposites of nanofibrillated cellulose with thermoset resins

Abstract of Papers of the American Chemical Society, 2014

Research paper thumbnail of Compression-moulded and multifunctional cellulose network materials

Research paper thumbnail of Prototype speaker verification Mayes

Research paper thumbnail of Audio File: Prototype speaker verification: Artist Romi Mayes

Research paper thumbnail of Stiff and Ductile Nanocomposites of Epoxy Reinforced With Cellulose Nanofibrils

Research paper thumbnail of Microstructure and micromechanical studies of injection moulded Chemically Modified Wood / Poly(lactic acid) Composites

Conventional wood plastic composites (WPCs) in general combine wood residuals with thermoplastics... more Conventional wood plastic composites (WPCs) in general combine wood residuals with thermoplastics such as polyethylene and polypropylene. The basic idea in this work is to replace these olefin pl ...

Research paper thumbnail of The Royal Society of Cellulose nano fi bers decorated with magnetic nanoparticles – synthesis , structure and use in magnetized high toughness membranes for a prototype loudspeaker †

Research paper thumbnail of Influence of processing routes on morphology and low strain stiffness of polymer/nanofibrillated cellulose composites

Plastics Rubber and Composites

The morphology of polymer/nanofibrillated cellulose (NFC) composite sheets produced using differe... more The morphology of polymer/nanofibrillated cellulose (NFC) composite sheets produced using different techniques and its influence on low strain stiffness were assessed by optical and transmission electron microscopy. Solvent processing led to relatively homogeneous NFC dispersions and significant reinforcement of the in-plane Young's modulus. The continuous cellular networks obtained by wet comingling of polylactide powder or latex with NFC also provided efficient and essentially scale independent reinforcement, in spite of the extensive agglomeration of the NFC. However, the irreversible nature of these networks is incompatible with low pressure thermoplastic processing routes such as physical foaming, and while they may be broken up by e.g. extrusion, this led to substantial loss in reinforcement, particularly at temperatures above the glass transition temperature of the matrix, consistent with the observation of isolated low aspect ratio NFC aggregates in the extruded specimens.

Research paper thumbnail of Biocomposites of nanofibrillated cellulose with thermoset resins

Reference EPFL-CONF-207220View record in Web of Science Record created on 2015-04-13, modified on... more Reference EPFL-CONF-207220View record in Web of Science Record created on 2015-04-13, modified on 2016-08-09

Research paper thumbnail of Cellulose network materials - compression molding and magnetic functionalization

All-cellulose composites are commonly prepared using cellulose solvents. In this study, moldable ... more All-cellulose composites are commonly prepared using cellulose solvents. In this study, moldable all-cellulose I wood fiber materials of high cellulose purity (97%) were successfully compression molded. Water is the only processing aid. The material is interesting as a "green" biocomposite for industrial applications. Dissolving wood fiber pulps (Eucalyptus hardwood and conifer softwood) are used and the influence of pulp origin, beating and pressing temperature (20-180 degrees C) on supramolecular cellulose nanostructure is studied by solid state CP/MAS C-13 NMR. Average molar mass is determined by SEC to assess process degradation effects. Mechanical properties are determined in tensile tests. High-density composites were obtained with a Young's modulus of up to 13 GPa. In addition, nanoscale cellulose fibril aggregation was confirmed due to processing, and resulted in a less moisture sensitive material.

Research paper thumbnail of Cellulose nanofibrils decorated by inorganic nanoparticles and used in magnetic nanocomposite membranes of high toughness

Cellulose nanofibrils decorated by inorganic nanoparticles and used in magnetic nanocomposite mem... more Cellulose nanofibrils decorated by inorganic nanoparticles and used in magnetic nanocomposite membranes of high toughness

Research paper thumbnail of Cellulose nanofiber network of high specific surface area provides altered curing reacion and moisture stability in ductile epoxy biocomposites

Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood... more Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood, textiles). Additional developments are suggested by the growing interest for natural fibre-based composite and nanocomposite materials. The motivation is not only in the economic and ecological benefits, but is also related to advantageous properties and characteristics. The objective of this thesis is to provide a better understanding of process-structure-property relationships in some novel cellulose network materials with advanced functionalities, and showing potential large-scale processability. An important result is the favourable combination of mechanical properties observed for network-based cellulose materials.Compression-moulding of cellulose pulp fibres under high pressure (45 MPa) and elevated temperature (120 – 180 oC) provides an environmentally friendly process for preparation of stiff and strong cellulose composite plates. The structure of these materials is characteriz...

Research paper thumbnail of High-temperature copolyamides obtained by the efficient transamidation of crystalline-crystalline polyamide blends

Journal of Applied Polymer Science

High-performance thermoplastic composites based on semiaromatic polyamides are prime candidates f... more High-performance thermoplastic composites based on semiaromatic polyamides are prime candidates for metal replacement in lightweight structural applications. However, the low ductility and toughness of semiaromatic polyamides remain major obstacles to their wider industrial application. In this study, we showed that novel random copolymers were formed by the unexpectedly efficient transamidation during the melt compounding of semicrystalline semiaromatic and aliphatic polyamides. Thus, homogeneous materials with a single glass transition and a high degree of crystalline order were obtained from blends of the semiaromatic poly(hexamethylene terephthalamide-co-isophthalamide) (PA6TI) with poly(hexamethylene adipamide) (PA66) or poly(hexamethylene sebacoamide) (PA610). By contrast, phase segregation and a less efficient transamidation was observed for cocompounded PA6TI and polylaurolactam (PA12). We attributed this to differences in the hydrogen-bonding patterns of the two polyamides. This study opened the way for the preparation of novel high-performance thermoplastic polyamides and composites through simple melt compounding. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44349.

Research paper thumbnail of Elastic properties of cellulose nanopaper

Research paper thumbnail of Compression-moulded and multifunctional cellulose network materials

Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood... more Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood, textiles). Additional developments are suggested by the growing interest for natural fibre-based c ...

Research paper thumbnail of High-Performance Polyamides with Engineered Disorder

Polymer Chemistry

The extraordinary property profiles of many biological materials derive from their hierarchical s... more The extraordinary property profiles of many biological materials derive from their hierarchical structure and control of order and disorder at different length scales. Application of these concepts to the design...

Research paper thumbnail of A non-solvent approach for high-stiffness all-cellulose biocomposites based on pure wood cellulose

Composites Science and Technology, Oct 1, 2010

All-cellulose composites are commonly prepared using cellulose solvents. In this study, moldable ... more All-cellulose composites are commonly prepared using cellulose solvents. In this study, moldable all-cellulose I wood fiber materials of high cellulose purity (97%) were successfully compression molded. Water is the only processing aid. The material is interesting as a “green” ...

Research paper thumbnail of Cellulose nanofiber network of high specific surface area provides altered curing reacion and moisture stability in ductile epoxy biocomposites

Research paper thumbnail of Cellulose nanofibrils decorated by inorganic nanoparticles and used in magnetic nanocomposite membranes of high toughness

Research paper thumbnail of Cellulose network materials - compression molding and magnetic functionalization

Research paper thumbnail of Biocomposites of nanofibrillated cellulose with thermoset resins

Abstract of Papers of the American Chemical Society, 2014

Research paper thumbnail of Compression-moulded and multifunctional cellulose network materials

Research paper thumbnail of Prototype speaker verification Mayes

Research paper thumbnail of Audio File: Prototype speaker verification: Artist Romi Mayes

Research paper thumbnail of Stiff and Ductile Nanocomposites of Epoxy Reinforced With Cellulose Nanofibrils