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Improving the thermal stability of MS polymers with lignin fractions / Hanne Mariën in ADHESION - ADHESIVES + SEALANTS, Vol. 19, N° 3/2022 (2022)
[article]
Titre : Improving the thermal stability of MS polymers with lignin fractions Type de document : texte imprimé Auteurs : Hanne Mariën, Auteur ; Luc Peeters, Auteur ; Tatsuro Harumashi, Auteur ; Maarten Rubens, Auteur ; Richard Vendamme, Auteur ; Roel Vleeschouwers, Auteur ; Karolien Vanbroekhoven, Auteur Année de publication : 2022 Article en page(s) : p. 30-33 Note générale : Bibliogr. Langues : Multilingue (mul) Catégories : Adhésifs -- Propriétés thermiques
Alliages polymères -- Propriétés thermiques
Formulation (Génie chimique)
LignineLa lignine est un des principaux composants du bois, avec la cellulose, l'hémicellulose et des matières extractibles. La lignine est présente principalement dans les plantes vasculaires et dans quelques algues. Ses principales fonctions sont d'apporter de la rigidité, une imperméabilité à l'eau et une grande résistance à la décomposition. Toutes les plantes vasculaires, ligneuses et herbacées, fabriquent de la lignine. Quantitativement, la teneur en lignine est de 3 à 5 % dans les feuilles, 5 à 20 % dans les tiges herbacées, 15 à 35 % dans les tiges ligneuses. Elle est moindre pour les plantes annuelles que pour les vivaces, elle est maximum chez les arbres. La lignine est principalement localisée entre les cellules (voir parois pectocellulosiques), mais on en trouve une quantité significative à l'intérieur même de celles-ci. Bien que la lignine soit un réseau tridimensionnel hydrophobe complexe, l'unité de base se résume essentiellement à une unité de phénylpropane. La lignine est le deuxième biopolymère renouvelable le plus abondant sur la Terre, après la cellulose, et, à elles deux, elles cumulent plus de 70 % de la biomasse totale. C'est pourquoi elle fait l'objet de recherches en vue de valorisations autres que ses utilisations actuelles en bois d'œuvre et en combustible.
Voie de biosynthèse : La lignine est une molécule dont le précurseur est la phénylalanine. Cet acide aminé va subir une cascade de réactions faisant intervenir une dizaine de familles d'enzymes différentes afin de former des monolignols. Ces enzymes sont : phénylalanine ammonia-lyase (PAL), cinnamate 4-hydroxylase (C4H), 4-coumarate:CoA ligase (4CL), hydroxycinnamoyl-CoA shikimate/quinate hydroxycinnamoyl transferase (HCT), p-coumarate 3-hydroxylase (C3H), caffeoyl-CoA o-methyltransferase (CCoAOMT), cinnamoyl-CoA reductase (CCR), ferrulate 5-hydroxylase (F5H), caffeic acid O-methyltransferase (COMT) et cinnamyl alcohol deshydrogenase (CAD). Dans un certain nombre de cas, des aldéhydes peuvent également être incorporés dans le polymère.
Oligomères
Polymère silicone modifié
Stabilité thermiqueIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : In this work, partly bio-based MS polymer products were developed by blending tailored lignin-based molecules into MS polymer. It is shown that not only the mechanical properties could be tuned by introducing these lignin fragments, but also the thermal stability of the polymer blends and the resulting adhesive formulations can be strongly improved. Note de contenu : - Procedure
- Blending of MS polymer with non-reactive (NR) lignin fragment
- Blending of MS polymer with reactive (R) lignin fragments
- Fig. 1 : Schematic representation of the different steps involved toward the design of lignin-based fragments with tailored molecular structures (a). Schematic representation of the blending of MS polymer with (b) non-reactive, and (c) reactive lignin fragments
- Fig. 2 : Thermal stability at 120°C of a general purpose adhesive formulation based on MS polymer and its blend with a non-reactive lignin oligomer
- Fig. 3 : Thermal stability at 120°C of a general purpose adhesive formulation based on MS polymer and its blends with different reactive lignin fragments
- Fig. 4 : Thermal stability at 150, 180, 200 and 230 °C of a general purpose adhesive formulation based on MS polymer and its blends with different reactive lignin fragments.
- Table 1 : Tensile properties and thermal stability of MS polymer and its blends with different non-reactive lignin fragments
- Table 2 : Tensile properties and thermal stability of MS Polymer and its blends with different reactive lignin fragmentsEn ligne : https://drive.google.com/file/d/1iGdQwx3f3-Je3RlVE3-PaCA0KeDCz26g/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38095
in ADHESION - ADHESIVES + SEALANTS > Vol. 19, N° 3/2022 (2022) . - p. 30-33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23512 - Périodique Bibliothèque principale Documentaires Disponible In situ polymerization of PET in the presence of pristine and organo-modified clays / Babak Esmaeili in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)
[article]
Titre : In situ polymerization of PET in the presence of pristine and organo-modified clays Type de document : texte imprimé Auteurs : Babak Esmaeili, Auteur ; C. Dubois, Auteur ; P. J. Carreau, Auteur ; M.-C. Heuzey, Auteur Année de publication : 2013 Article en page(s) : p. 331-340 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Cloisite
Matériaux hybrides
Microscopie électronique à balayage
Montmorillonite
Oligomères
Polycondensation
Polyéthylène téréphtalate
Polymérisation
SilicatesIndex. décimale : 668.4 Plastiques, vinyles Résumé : In this work two types of montmorillonite, a pristine and an organo-modified clay (Cloisite 30B), were employed to produce (polyethylene terephthalate)-based nanocomposites via in situ polymerization. Using water as an intermediate medium, a stable dispersion of pristine clay in ethylene glycol was achieved. However, after polymerization, no significant gain was obtained in terms of delamination of silicate platelets. The polycondensation reaction when using Cloisite 30B was carried out at a temperature as low as 250 °C in order to retain a considerable portion of the organo-modifier. The results showed that Cloisite 30B was successfully intercalated by the polymer chains, resulting in a d-spacing increase from 1.9 nm to about 3.6 nm. Although some mono and double silicate layers were observed in microscopy images, the major part of the organoclay remained in a tactoid intercalated form. Sampling during the polycondensation reaction revealed that, in this process, clay was first swelled efficiently by the monomer, and this structure was preserved in the early stage of polycondensation. However, the silicate platelets collapsed with time as the polycondensation progressed and larger molecular weight oligomers were formed. An investigation on the type of impeller used in the polymerization process showed that a slight improvement was achieved in terms of aggregate size and distribution when the anchor impeller was replaced by a helical one. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Insitu polymerization procedure
- CHARACTERIZATION
- RESULTS AND DISCUSSION : Incorporation of pristine clay in the polymerization process - Incorporation of cloisite 30B in the polymerization process - The effect of impellerDOI : 10.3139/217.2760 En ligne : https://drive.google.com/file/d/1NKVQI71S9dtRtWmF9aqWsAS0geFf6Wxb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19023
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 331-340[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15238 - Périodique Bibliothèque principale Documentaires Disponible Influence of functional group content in hydroxyl-functionalized urethane methacrylate oligomers on the crosslinking features of clearcoats / Young-Gun June in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
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Titre : Influence of functional group content in hydroxyl-functionalized urethane methacrylate oligomers on the crosslinking features of clearcoats Type de document : texte imprimé Auteurs : Young-Gun June, Auteur ; Kevin Injoe Jung, Auteur ; Dong Geun Lee, Auteur ; Subin Jeong, Auteur ; Tae-Hee Lee, Auteur ; Young Il Park, Auteur ; Seung Man Noh, Auteur ; Hyun Wook Jung, Auteur Année de publication : 2021 Article en page(s) : p. 229-237 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Basses températures
Liants
Méthacrylate d'uréthane
Oligomères
Réticulants
Réticulation (polymérisation)
Revêtements organiques
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : Crosslinking characteristics and surface mechanical properties of radical and urethane dual-curable clearcoats were investigated by changing quantities of C=C bonds and OH groups in hydroxyl-functionalized urethane methacrylate oligomer (HFUMO) resins. The isocyanate blocked with a thermal radical initiator (BL-Tri-cHD) was utilized as a hybrid dual-curable thermal crosslinker to expedite the crosslinking of the main resin. The dual reactions between various HFUMO resins and BL-Tri-cHD were efficiently monitored via Fourier transform infrared spectroscopy to measure the peaks before and after curing. The influence of each functional group (C=C bond or OH group) in HFUMO on the initiation and development of crosslinking in dual-curable clearcoats was investigated by real-time measurements using rotational rheometer and rigid body pendulum tester. Temperature-dependent mechanical properties of cured films were confirmed through dynamic mechanical analysis. The surface mechanical properties of cured clearcoat films were also evaluated via the nanoindentation and nanoscratch tests, demonstrating the variation in surface resistance with respect to the C=C bond content and the OH value. Thus, the low-temperature curing and desired mechanical properties of clearcoats can be optimized by adjusting the content of the functional groups in a HFUMO and using a dual-curable crosslinker to simultaneously generate both radical and urethane crosslinking reactions. Note de contenu : - EXPERIMENTAL METHOS : Synthesis of HFUMOs and blocked isocyanate using a TRI (BL-Tri-cHD) - Formulation of clearcoats with various HFUMO resins - Variations in functional groups by FTIR analysis - Real-time crosslinking behaviors of HFUMO-based clearcoats - Dynamic mechanical analysis of cured films - Surface mechanical properties of cured films
- RESULTS AND DISCUSSION : FTIR analysis of clearcoats with varying quantities of functional groups in HFUMOs - Rheological analysis of crosslinking behavior - Analysis of curing behaviors using RPT - Dynamic mechanical analysis - Indentation depth profiles - Scratch depth profiles
- Table 1 : Formulation of clearcoat mixtures with various HFUMOs with different contents of C=C bond and OH groupDOI : https://doi.org/10.1007/s11998-020-00398-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00398-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35365
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Interface-driven phase-separated coatings / E. Alyamac in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 5 (09/2014)
[article]
Titre : Interface-driven phase-separated coatings Type de document : texte imprimé Auteurs : E. Alyamac, Auteur ; H. Gu, Auteur ; Mark D. Soucek, Auteur Année de publication : 2014 Article en page(s) : p. 665-684 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère acrylique fluoré
Epoxydes
MiscibilitéLa miscibilité désigne usuellement la capacité de divers liquides à se mélanger.
Oligomères
Séparation (technologie)
TétraéthoxysilaneIndex. décimale : 667.9 Revêtements et enduits Résumé : A homogeneous mixture of two polymers dissolved in a common solvent or a mixture of solvents was applied as a thin film. The first component was a bisphenol-A based epoxide derivative modified with tetraethoxysilane (TEOS) oligomer and the second component was a high-solids fluorinated acrylic copolymer. The thin films were coated on steel substrates and were thermally crosslinked using a methylated melamine formaldehyde and/or a polyamide-amine curing agent. The films were evaluated via x-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) with integrated energy dispersive spectroscopy (EDS). It was found that the molecular weight of the resins, fluorine content, epoxide inorganic modification, and curing agent affected the degree of stratification. Note de contenu : - EXPERIMENTAL : Matérials - General synthesis procedure for acrylate (phase A) - Preparation of epoxide derivative (Primer coat : phase B) - Synthesis of BPA-based epoxy ester (EE) - Prepation of TEOS oligomers and TEOS oligomer-modified epoxides - Film preparation and coating tests - Instruments
- RESULTS AND DISCUSSION : Preparation and coating properties of thermosetting two-phase films - XPS analysis - FTIR-ATR analysis - Elements mapping with ESEM-EDS - Film propertiesDOI : 10.1007/s11998-014-9591-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9591-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22050
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Code-barres Cote Support Localisation Section Disponibilité 16538 - Périodique Bibliothèque principale Documentaires Disponible Isocyanate-free routes : / Jurgen van Hollen in EUROPEAN COATINGS JOURNAL (ECJ), N° 06-07/2007 (07-08/2007)
[article]
Titre : Isocyanate-free routes : : Environmentally friendly alternatives to high performance coatings Type de document : texte imprimé Auteurs : Jurgen van Hollen, Auteur Année de publication : 2007 Article en page(s) : p. 10-11 Note générale : Bibliogr. (encart de 12 p. entre les p. 18-19) Langues : Anglais (eng) Catégories : Copolymère uréthane acrylique
Isocyanates -- Suppression ou remplacement
Oligomères
Polyuréthanes
Revêtements organiques
Revêtements sans isocyanatesIndex. décimale : 667.9 Revêtements et enduits Résumé : Ever since polyurethanes were first discovered in the late thirties they have found an ever increasing number of applications due to they unique properties. Most of them are attributed to the ability to organize themselves in the so called hard and soft micro domains. As their production involves toxic raw materials such as isocyanates there has been a continuous search to find alternative routes which make use of safer chemicals. Despite many efforts no-one has been able to product high molecular weight linear polyurethanes. Acrylated oligourethanes have been produced in commercial quantities without using isocyanates and they have given rise to high performing coatings after cross linking initiated withultraviolet radiation. Note de contenu : - Several alternatives proposed
- The cyclic carbonate route
- Chemical and enzymatic transurethanisation
- Bright future
- Fig. 1 : Formation of a b-hydroxy-urethane group
- Fig. 2 : Production of a methacrylated carbonate with carbondioxideEn ligne : https://drive.google.com/file/d/1yJ_bncWP9bTc1q8AbmNRHOUqPJzB0TSt/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40653
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 06-07/2007 (07-08/2007) . - p. 10-11[article]Réservation
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