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Monte Carlo simulation of polymer syntheses: a useful tool to judge the REACH and OECD polymer status / Henk J. W. Van Den Haak in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)
[article]
Titre : Monte Carlo simulation of polymer syntheses: a useful tool to judge the REACH and OECD polymer status Type de document : texte imprimé Auteurs : Henk J. W. Van Den Haak, Auteur Année de publication : 2018 Article en page(s) : p. 671-678 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie industrielle -- Législation
Chromatographie sur gel
Monte-Carlo, Méthode de
Polymères -- Synthèse
Simulation par ordinateurIndex. décimale : 667.9 Revêtements et enduits Résumé : The REACH or OECD polymer definition requires a certain chain length, rather than a molecular weight. This makes it very difficult to decide from gel permeation chromatography (GPC) alone whether a substance complies with the REACH polymer definition. Therefore, in parallel to the real in vitro syntheses, we simulated the preparation of polycondensation and polyaddition resins by means of well-known Monte Carlo methods. The output of these simulations (basically a list of all the molecules formed, their molecular weights, and their relative quantities) was used to simulate a GPC. The simulation parameters (reaction types and relative reaction rates) were adapted until a good match between the measured and the simulated GPC was obtained. The simulation was then considered trustworthy. This appeared to be a strong tool to judge if a product is a polymer according to REACH, EPA, or emerging worldwide legislation. Note de contenu : - Simulation of polymerizations
- Simulation of the GPC
- REACH
- EPADOI : 10.1007/s11998-018-0043-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0043-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30845
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Code-barres Cote Support Localisation Section Disponibilité 20078 - Périodique Bibliothèque principale Documentaires Disponible Morphology tuning of conducting polyaniline via static, liquid-liquid interfacial polymerization process and its application for optical pH sensing / S. M. Thorat in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
[article]
Titre : Morphology tuning of conducting polyaniline via static, liquid-liquid interfacial polymerization process and its application for optical pH sensing Type de document : texte imprimé Auteurs : S. M. Thorat, Auteur ; M. V. Kulkarni, Auteur Année de publication : 2015 Article en page(s) : p. 243-247 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Conducteurs organiques
Interfaces liquide-liquide
Nanoparticules -- Synthèse
Polyaniline
Polymères -- Synthèse
Polymérisation interfaciale
Solutions aqueuses (chimie)Index. décimale : 668.4 Plastiques, vinyles Résumé : Nanorods/nanofibers of conducting polymer, polyaniline (PANI) were synthesized via static, liquid-liquid interfacial polymerization process using ammonium persulphate as an oxidizing agent. The monomer, aniline was dissolved in chloroform comprising the organic phase, while the oxidizing agent, ammonium per sulphate was dissolved in doubly distilled water to form an aqueous phase. Para toluene sulphonic acid (p-TSA) was used as dopant during the polymerization process to dope the polyaniline. The presence of conducting emeraldine salt phase of the polymer was confirmed by UV-Vis. and FT-IR spectroscopic characterization. This was further supported by XRD analysis. The morphological studies are carried out using FE-SEM analysis and revealed the presence of uniform sized nanorods/nanofibers having diameter of ?90 nm and length up to few microns. This rapid and novel interfacial polymerization process shows the potential of large scale synthesis of uniform sized nanorods/nanofibers of polyaniline. The synthesized nanostructured polyaniline was successfully utilized for the optical pH sensing application in aqueous state. Note de contenu : - UV-visible spectroscopy
- FT-IR spectroscopy
- FE-SEM analysisDOI : 10.3139/217.2998 En ligne : https://drive.google.com/file/d/13Ekbdp20RHCKUTqQ8I0i9YYw7cUEFXXt/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23906
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 2 (05/2015) . - p. 243-247[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17180 - Périodique Bibliothèque principale Documentaires Disponible A multifunctional antifog, antifrost, and self-cleaning zwitterionic polymer coating based on poly(SBMA-co-AA) / Weirong Zou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)
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Titre : A multifunctional antifog, antifrost, and self-cleaning zwitterionic polymer coating based on poly(SBMA-co-AA) Type de document : texte imprimé Auteurs : Weirong Zou, Auteur ; Zhuizhui Fan, Auteur ; Shixiong Zhai, Auteur ; Siwei Wang, Auteur ; Bi Xu, Auteur ; Zaisheng Cai, Auteur Année de publication : 2020 Article en page(s) : p. 765–776 Note générale : Bibliogr. Langues : Américain (ame) Catégories : acrylique, Acide L'acide acrylique ou acide acroléïque ou acide prop-2-énoïque est un composé organique de formule brute C3H4O2 et de formule semi-développée CH2=CHCOOH. C'est un acide carboxylique et un alcène vinylique, et se présente comme un liquide incolore à l'odeur âcre.
L'acide acrylique et ses esters, les acrylates, sont utilisés dans la fabrication de matières plastiques, dans les peintures acryliques et dans divers autres polyacryliques qui ont de multiples usages.
Auto-nettoyage
Durée de vie (Ingénierie)
Greffage (chimie)
Polymères -- Synthèse
Polysulfobétaine méthacrylate
Revêtements anti-buée
Revêtements antigel
Revêtements organiques
ZwitterionsUn zwitterion (de l'allemand Zwitter — "hybride", "hermaphrodite » prononcé [t͜svɪtɛrjɔ̃]) est une espèce chimique moléculaire possédant des charges électriques formelles d’une unité, de signes opposés et situées en général sur des atomes non adjacents (dans le cas où les deux charges formelles sont portées par deux atomes adjacents, on parle d'ylures comme les ylures de phosphore). Les acides aminés, qui possèdent des groupements amine (sous forme d'ammonium NH3+ à pH =7) et acide carboxylique (sous forme de carboxylate COO- à pH =7) peuvent exister sous forme zwitterionique (à l'état solide, dans certaines gammes de pH en solution aqueuse) . Les bétaïnes sont d'autres exemples de zwitterions.Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, a multifunctional coating was developed by grafting a zwitterionic poly[2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)-co-acrylic acid [poly(SBMA-co-AA)] polymer onto a glass slide, which possesses excellent antifog, antifrost, and self-cleaning properties. These properties are attributed to the strong hydration of the hydrophilic zwitterionic PSBMA segments. The durability of the coating can be improved because the carboxyl group (–COOH) of the PAA segment enables formation of a robust covalent bond with the amino group (–NH2) on the substrate. The coating presents long-term stability, as proved by water contact angles, which were stable at 12 ± 1° after exposing the coating in ambient environment for 60 days or immersing in deionized water for 24 h. In addition, the underwater oil contact angle measurement demonstrated that an oil stain on the zwitterionic poly(SBMA-co-AA) polymer coating can be easily removed upon contact with water, showing self-cleaning performance. These properties verified that the zwitterionic multifunctional coating exploited in this research has many potential application prospects, including construction, automotive, aerospace, shipbuilding, biomedical, and other optical fields. Note de contenu : - MATERIALS AND METHODS : Materials - Pretreatment of glass slide - Synthesis of poly(SBMA-co-AA) - Grafting poly(SBMA-co-AA) onto glass slide - Characterizations - Antifog and antifrost tests - Stability tests - Self-cleaning tests
- RESULTS AND DISCUSSION : Preparation and properties of the poly(SBMA-co-AA) coating - Antifog and antifrost performance - Long-term stability - Self-cleaning performanceDOI : https://doi.org/10.1007/s11998-020-00324-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-020-00324-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34106
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 3 (05-06/2020) . - p. 765–776[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21734 - Périodique Bibliothèque principale Documentaires Disponible Multifunctional carbon nanofiber systems mass produced from water soluble polymers / Lee D. Cremar in CHEMICAL FIBERS INTERNATIONAL, (09/2016)
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Titre : Multifunctional carbon nanofiber systems mass produced from water soluble polymers Type de document : texte imprimé Auteurs : Lee D. Cremar, Auteur ; Javier Acosta-Martinez, Auteur ; Alexsandra Villarreal, Auteur ; Alfonso Salinas, Auteur ; Lin Wei, Auteur ; Yuanbing Mao, Auteur ; Karen Lozano, Auteur Année de publication : 2016 Article en page(s) : p. 71-73 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbonisation
Déshydratation
Fibres de carbone
Matériaux poreux
Nanofibres
Nontissés
Polymères -- Synthèse
Technique de la productionIndex. décimale : 677.4 Textiles artificiels Résumé : The high cost of polymer precursors, usage of organicsolvents and/or energy consumption during carbonization post-processes has limited the use of carbon fiber systems for every day applications. Here, nonwoven nanofiber mats are developed utilizing the Forcespinning technology and subsequently exposed to acid vapor induced dehydration and low temperature carbonization (T C 800 °C) processes to produce multifunctional fine carbon fibers. This method allows for the production of highly porous nonwoven carbon cloths or yarns with micro- and mesoporosity. The fiber diameter can be tuned in the range of hundreds of nanometers to several microns. Thermophysical and microstructural characterization indicate graphitic formation due to carbonization that occurs during the chemical and heat treatment. The developed system shows high electrical conductivity, high surface area, thermal stability, hydrophobicity, and oleophilic behavior. En ligne : https://drive.google.com/file/d/1CZ5uOtnGzkESX329OXzY6LNEkdC3U9u7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26937
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Code-barres Cote Support Localisation Section Disponibilité 18302 - Périodique Bibliothèque principale Documentaires Disponible Nanolatex technology 1 : synthesis and characterization of nanosize acrylic latexes and comparison to their conventional size counterparts / Ravi G. Joshi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)
[article]
Titre : Nanolatex technology 1 : synthesis and characterization of nanosize acrylic latexes and comparison to their conventional size counterparts Type de document : texte imprimé Auteurs : Ravi G. Joshi, Auteur ; Frank N. Jones, Auteur ; Theodore Provder, Auteur ; Weidian Shen, Auteur Année de publication : 2021 Article en page(s) : p. 1481-1500 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Coalescence (Sciences physiques)
Formation de film
Latex
Microémulsions
Morphologie (matériaux)
Nanoparticules
Polyacryliques
Polymères -- Synthèse
Polymérisation en émulsion
Réticulation (polymérisation)
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : For this study, functional precoalescence (internally crosslinked) and postcoalescence (crosslinkable) conventional latexes were made using seeded semi-continuous emulsion polymerization. Nanosize polymer latexes with or without crosslinkable functional groups were made using a modified microemulsion copolymerization process. Films cast from conventional and nanosize latex were characterized using specific end use tests and fundamental properties using dynamic mechanical analysis, modulated differential scanning calorimetry, and atomic force microscopy. This study compares conventional and nanosize latex with respect to the effect of the type and level of crosslinking, particle size and distribution on latex film formation and morphology, and end use and fundamental properties. Nanosize latex films in general have superior gloss, solvent resistance, and adhesion but inferior water resistance. Stress–strain Young’s modulus showed an increase as a function of increasing crosslinker level in the nanosize latex films. Note de contenu : - EXPERIMENTAL : Preparation of nanoparticle latexes using improved modified microemulsion copolymerization - Materials - Preparation of conventional size precoalescence or postcoalescence crosslinked conventional latexes
- CHARACTERIZATION OF LATEXES : Latex properties - Film properties of conventional latexes and nanoparticle latexes - Thermal and mechanical properties of conventional latexes and nanoparticle latexes - Measurements with AFM of conventional latexes and nanoparticle latexes
- RESULTS AND DISCUSSIONS : Nanosize latex synthesis and characterization - Film formation by “precoalescence” and “postcoalescence” crosslinked latexes - Gel content results - End-use film properties - Fundamental mechanical properties - Stress–strain analysis of constituent nanosize latexes with precoalescence and postcoalescence crosslinking and comparisons with their conventional size counterparts - Dynamic mechanical properties
- Table 1 : Composition table for nanosize latexes (with or without functional group)
- Table 2 : Characteristics of conventional (with or without crosslinker) latexes
- Table 3 : Characteristics of nanosize (with or without crosslinker) latexes
- Table 4 : End-use properties of films cast from conventional latexes
- Table 5 : End-use properties of films cast from nanosize latexes AFM results
- Table 6 : Comparison of surface smoothness and gloss values of nanoparticle latexes and their conventional counter parts
- Table 7 : Results of stress–strain analysis of nanosize latexes
- Table 8 : Results of stress–strain analysis of conventional size latexes
- Table 9 : Comparison of DMA values with MDSC Tg values of conventionally size precoalescence or postcoalescence crosslinked latexes
- Table 10 : Comparison of DMA values with MDSC Tg values of nanosize precoalescence or postcoalescence crosslinked latexesDOI : https://doi.org/10.1007/s11998-021-00475-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00475-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36803
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1481-1500[article]Réservation
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