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Relevant bibliographies by topics / Quaternary ammonium polymers

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Academic literature on the topic 'Quaternary ammonium polymers'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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Journal articles on the topic "Quaternary ammonium polymers"

1

Domb, Abraham J., Nurit Beyth, and Shady Farah. "QUATERNARY AMMONIUM ANTIMICROBIAL POLYMERS." MRS Proceedings 1569 (2013): 97–107. http://dx.doi.org/10.1557/opl.2013.907.

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ABSTRACTPolymers possessing antimicrobial activity have been used for self sterilization surfaces as well as agents for treating contaminated water. Cationic polymers based on quaternary ammonium or guanidine groups have shown high inherent antimicrobial activity where the activity is related to the disruption of the microorganism cell wall. A range of antimicrobial nanoparticles possessing active quaternary ammonium groups with one of the alkyl is a an octyl chain have been synthesized. These nanoparticles were incorporated in dental restoration compositions to form self sterile composites. Quaternary ammonium polyethyleneimine nanoparticles with N-octyl dimethyl residues, demonstrated high antibacterial effect.

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Lee, Seunghyun, Hyejin Lee, Tae-Hyun Yang, Byungchan Bae, Nguyen Anh Thu Tran, Younghyun Cho, Namgee Jung, and Dongwon Shin. "Quaternary Ammonium-Bearing Perfluorinated Polymers for Anion Exchange Membrane Applications." Membranes 10, no. 11 (October 26, 2020): 306. http://dx.doi.org/10.3390/membranes10110306.

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Perfluorinated polymers are widely used in polymer electrolyte membranes because of their excellent ion conductivity, which are attributed to the well-defined morphologies resulting from their extremely hydrophobic main-chains and flexible hydrophilic side-chains. Perfluorinated polymers containing quaternary ammonium groups were prepared from Nafion- and Aquivion-based sulfonyl fluoride precursors by the Menshutkin reaction to give anion exchange membranes. Perfluorinated polymers tend to exhibit poor solubility in organic solvents; however, clear polymer dispersions and transparent membranes were successfully prepared using N-methyl-2-pyrrolidone at high temperatures and pressures. Both perfluorinated polymer-based membranes exhibited distinct hydrophilic-hydrophobic phase-separated morphologies, resulting in high ion conductivity despite their low ion exchange capacities and limited water uptake properties. Moreover, it was found that the capacitive deionization performances and stabilities of the perfluorinated polymer membranes were superior to those of the commercial Fumatech membrane.

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Itsuno, Shinichi, Miyuki Takahashi, Yukihiro Arakawa, and Naoki Haraguchi. "Synthesis of polymers containing chiral 1,2-diamine derivatives and their application to asymmetric reactions." Pure and Applied Chemistry 79, no. 9 (January 1, 2007): 1471–79. http://dx.doi.org/10.1351/pac200779091471.

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Polymer-supported chiral 1,2-diamine derivatives have been prepared. The polymers containing free 1,2-diamine moiety were applied to enantioselective hydrogenation catalyst by combination with RuCl2-BINAP complex. Asymmetric hydrogenation of aromatic ketones was performed by means of the polymeric catalyst derived from these polymers to give the chiral secondary alcohols with high ee in quantitative conversion. The polymers containing 1,2-diamine monosulfonamide were applied to enantioselective transfer hydrogenation catalyst by combination with RuCl2-p-cymene complex. Asymmetric transfer hydrogenation of aromatic ketones was performed by means of the polymeric catalyst to afford the chiral secondary alcohols. A high level of enantioselectivities up to 99 % ee was attained in neat water by using the polymeric catalyst prepared from quaternary ammonium salt-type polymer support.

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Wang, Li-Fei, Xing-Gui Liu, Mei-Mei Meng, Yong-Kai Xu, Rui Zhu, Rui Zhang, Zhen-Zhong Lu, and Wei Huang. "Three coordination polymers built by quaternary-ammonium-modified isophthalic acid." Acta Crystallographica Section C Structural Chemistry 77, no. 5 (April 9, 2021): 221–26. http://dx.doi.org/10.1107/s2053229621003296.

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Three coordination polymers based on quaternary-ammonium-modified isophthalic acid, namely, catena-poly[[[aqua-μ2-bromido-di-μ3-hydroxido-methanoldinitratotetracopper(II)]-bis{μ4-5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylato}] nitrate], {[Cu4Br(C19H28NO5)2(NO3)2(OH)2(CH4O)(H2O)]NO3} n , 1, poly[μ3-bromido-μ2-bromido-bromido-μ3-hydroxido-{μ4-5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylato}tricopper(II)], [Cu3Br3(C19H28NO5)(OH)] n , 2, and poly[bromido{μ3-5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylato}zinc(II)], [ZnBr(C19H28NO5)] n , 3, were obtained by solvothermal reactions. Coordination polymer (CP) 1 contains tetranuclear Cu4 units, in which the four Cu atoms are linked by two μ3-OH− groups into a Cu4(OH)2 cluster, which are in turn linked by 5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylate (cpa−) ligands into a chain structure. CP 2 also contains a tetranuclear Cu4(OH)2 cluster and these are linked with CuBr3 units into chains. The chains are then connected by cpa− ligands into a two-dimensional layered structure. CP 3 contains a two-dimensional layer structure built by binuclear Zn2 units and cpa− ligands. The Br− counter-anions of the quaternary ammonium groups all take part in the construction of the polymeric networks.

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Rassu, Giovanna, Silvia Fancello, Marta Roldo, Milo Malanga, Lajos Szente, Rossana Migheli, Elisabetta Gavini, and Paolo Giunchedi. "Investigation of Cytotoxicity and Cell Uptake of Cationic Beta-Cyclodextrins as Valid Tools in Nasal Delivery." Pharmaceutics 12, no. 7 (July 12, 2020): 658. http://dx.doi.org/10.3390/pharmaceutics12070658.

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Cyclodextrin polymers have high applicability in pharmaceutical formulations due to better biocompatibility, solubility enhancement, loading capacity and controlled drug release than their parent, cyclodextrins. The cytotoxicity and cell uptake of new cationic beta-cyclodextrin monomers and polymers were evaluated as suitable materials for nasal formulations and their protective effects on cells exposed to hydrogen peroxide were studied. PC12 and CACO-2 cells were selected as the neuronal- and epithelial-type cells, respectively, to mimic the structure of respiratory and olfactory epithelia of the nasal cavity. All cationic beta-cyclodextrin polymers tested showed dose- and time-dependent toxicity; nevertheless, at 5 µM concentration and 60 min of exposure, the quaternary-ammonium-beta-cyclodextrin soluble polymer could be recognized as nontoxic. Based on these results, a fluorescently labelled quaternary-ammonium-beta-cyclodextrin monomer and polymer were selected for uptake studies in CACO-2 cells. The monomeric and polymeric beta-cyclodextrins were internalized in the cytoplasm of CACO-2 cells; the cationic monomer showed higher permeability than the hydroxypropyl-beta-cyclodextrin, employed as comparison. Therefore, these cationic beta-cyclodextrins showed potential as excipients able to improve the nasal absorption of drugs. Furthermore, amino-beta-cyclodextrin and beta-cyclodextrin soluble polymers were able to reduce oxidative damage in PC12 and CACO-2 cells and thus could be studied as bioactive carriers or potential drugs for cell protection against oxidative stress.

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Kim, Dae-Hee, Min-Yeong Jung, Hyun Park, In-Won Lee, Ho-Hwan Chun, and Nam-Ju Jo. "Antifouling Paint Resin Based on Polyurethane Matrix with Quaternary Ammonium Salt." Polymer Korea 39, no. 1 (January 25, 2015): 122–29. http://dx.doi.org/10.7317/pk.2015.39.1.122.

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Carpov, A., C. Luca, S. Drăgn, and I. Petrariu. "New Aspects of Polymers Containing Quaternary Ammonium Groups." Journal of Macromolecular Science: Part A - Chemistry 22, no. 5-7 (May 1985): 907–29. http://dx.doi.org/10.1080/00222338508056644.

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Raja, Arsalan A., and Cafer T. Yavuz. "Charge induced formation of crystalline network polymers." RSC Adv. 4, no. 104 (2014): 59779–84. http://dx.doi.org/10.1039/c4ra10594j.

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Ji, Weihang, Richard R. Koepsel, Hironobu Murata, Sawyer Zadan, Alan S. Campbell, and Alan J. Russell. "Bactericidal Specificity and Resistance Profile of Poly(Quaternary Ammonium) Polymers and Protein–Poly(Quaternary Ammonium) Conjugates." Biomacromolecules 18, no. 8 (July 14, 2017): 2583–93. http://dx.doi.org/10.1021/acs.biomac.7b00705.

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Bonenfant, Danielle, François-René Bourgeois, Murielle Mimeault, Frédéric Monette, Patrick Niquette, and Robert Hausler. "Synthesis and structure-activity study of quaternary ammonium functionalized β-cyclodextrin-carboxymethylcellulose polymers." Water Science and Technology 63, no. 12 (June 1, 2011): 2827–32. http://dx.doi.org/10.2166/wst.2011.630.

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Carboxymethylcellulose (CMC) and β-cyclodextrin (β-CD)-based polymers functionalized with two types of quaternary ammonium compounds (QACs), the alkaquat DMB-451 (N-alkyl (50% C14, 40% C12, 10% C10) dimethylbenzylammonium chloride) (DMD-451) named polymer DMB-451, and FMB 1210-8 (a blend of 32 w% N-alkyl (50% C14, 40% C12, 10% C10) dimethylbenzylammonium chloride and 48 w% of didecyldimethylammonium chloride) named polymer FMB 1210-8, were synthethized and characterized by Fourier transform infrared spectroscopy. The antimicrobial activities of these polymers against Eschericia coli were also evaluated at 25 °C in wastewater. The results have indicated that the polymer FMB 1210-8 possesses a high-affinity binding with bacterial cells that induces a rapid disinfection process. Moreover, in the same experimental conditions of disinfection (mixture of 1.0 g of polymer and 100 mL of wastewater), the polymer FMB 1210-8 has a higher antimicrobial efficiency (99.90%) than polymer DMB-451 (92.8%). This phenomenon might be associated to a stronger interaction with bacterial cells due to stronger binding affinity for E. coli cells and greater killing efficiency of the C10 alkyl chains QAC of polymer FMB 1210-8 to disrupt the bacterial cell membrane as compared to N-alkyl (50% C14, 40% C12, 10% C10) dimethylbenzylammonium chloride. Together, these results suggest that the polymer FMB 1210-8 could constitute a good disinfectant against Escherichia coli, which could be advantageously used in wastewater treatments due to the low toxicity of β-CD and CMC, and moderated toxicity of FMB 1210-8 to human and environment.

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Dissertations / Theses on the topic "Quaternary ammonium polymers"

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Chen, Xiaocheng. "Synthesis of 10-Carboxy-N-Decyol-N, N’- Dimethyldecyl-1-Ammonium Bromide as Organogelator & Room temperature Shape Memory Programming of Stearic Acid/ Natural Rubber Bilayer Blend." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1500563824207268.

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Zander, Zachary K. Zander. "Developing Functionalized Polymer Systems to Promote Specific Interactions and Properties." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1521497140602076.

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Chen, Keke. "Roll-to-Roll Manufacturing and Real-Time Characterization of Bio-Functional Polymers." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1548177736839976.

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Pitia, Emmanuel Sokiri. "Composite Proton Exchange Membrane Based on Sulfonated Organic Nanoparticles." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1339277956.

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Tijen, Seyidoglu. "Purification And Modification Of Bentonite And Its Use In Polypropylene And Linear Low Density Polyethylene Matrix Nanocomposites." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612204/index.pdf.

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The potential use of Resadiye/Tokat bentonite as a reinforcement in polypropylene (PP) and linear low density polyethylene (LLDPE) polymer matrix nanocomposites filler was investigated. At first, organoclays (OC) were prepared by cation exchange reaction (CER) between the raw bentonite (RB) and three quaternary ammonium salts with long alkyl tails (QA): hexadecyl trimethyl ammonium bromide [HMA] [Br], tetrabutyl ammonium tetrafluoroborate [TBA] [BF4], tetrakisdecyl ammonium bromide [TKA] [Br] and one quaternary phosphonium (QP) salt: tetrabutyl phosphonium tetrafluroborate [TBP] [BF4]. Characterization of resulting materials by XRD, TGA, FTIR and chemical analysis confirmed the formation of organoclays. Ternary composites of PP/organoclay/ maleic anhydride grafted polypropylene (MAPP) were prepared with two different grades of PPs in a co-rotating twin screw extruder. Composites prepared with these organoclays and PPs showed microcomposite formation. In the second part of the study, raw bentonite was purified by sedimentation, and characterization of purified bentonite (PB) by XRD, cation exchange capacity (CEC) measurement and chemical analysis (ICP) confirmed the success of purification method. PB was then modified with two QA`s: dimethyl dioctadecylammonium chloride [DMDA] [Cl], tetrakis decylammonium bromide [STKA] [Br] and one QP: tributyl hexadecyl phosphonium bromide [TBHP] [Br]. Organoclays from PB were used with the PP with lower viscosity, and ternary nanocomposites (PP/Organoclay2/MAPP5) were prepared in the extruder followed by batch mixing in an intensive batch mixer. Use of DMDA and TBHP OCs resulted in nanocomposite formation, while STKA resulted in microcomposite formation as observed by XRD and TEM. Young`s modulus and yield stress of the samples were enhanced through nanocomposite formation. In the last part of the study, ternary composites of LLDPE/Organoclay/ compatibilizer, a random terpolymer of ethylene, butyl acrylate and maleic anhydride (E-BA-MAH, Lotader®
3210), were prepared by melt compounding in the batch mixer at two different clay concentrations (2 and 5 wt %) and fixed compatibilizer/organoclay ratio (&alpha
=2.5). A commercial organoclay, I34, was also used in LLDPE based nanocomposites to make a comparison. XRD and TEM analyses of the compounds prepared by DMDA and TBHP showed mixed nanocomposite morphologies consisting of partially intercalated and exfoliated layers. Young`s modulus and tensile strength of nanocomposites prepared with DMDA and TBHP showed generally higher values compared to those of neat LLDPE, while results were the highest in the composites prepared with commercial organoclay I34. Parallel disk rheometry was used as a supplementary technique to XRD, TEM and mechanical characterizations, and it was shown to be a sensitive tool in assessing the degree of dispersion of clay layers in the polymer matrix.

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Ben, Fadhel Besma. "Voies alternatives de traitement pour l'obtention de papiers résistants à l'état humide et de textiles cellulosiques infroissables." Thesis, Mulhouse, 2012. http://www.theses.fr/2012MULH6631.

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Cette thèse comporte un volet papetier et un volet textile. Dans le premier volet, de nouveaux produits capables d’améliorer la résistance à l’état humide (REH) du papier et qui soient si possible ‘écologiques’ ont été recherchés. Dans ce but, nous avons synthétisé avec de bons rendements des sels d’ammoniums quaternaires (SAQs) allylés dont beaucoup sont originaux. Ces sels ont été par la suite polymérisés à l‘aide d’un réacteur micro-onde. Les polymères obtenus sont cationiques, hydrosolubles et amphiphiles. Après fixation sur papier, nous avons mis en évidence qu’un traitement bicouche avec un copolymère amphiphile à base de bromure N,N-diallyl-pyrrolidinium (BDAP) et de carboxyméthylcellulose (CMC) apporte de façon inattendu un caractère hydrophobe marqué au papier traité alors que des copolymères réactifs synthétisés à base de N,N-diallyl-3-hydroxy-azétidinium (CDAHA) sont capables de conférer au papier une REH comparable à celle fournie par les résines polyamide-amine-épichlorhydrine (ou PAE) commerciales. Concernant le volet textile, l’objectif était de produire une recette optimale de traitement infroissable pour un tissu 100% coton à base d’acides polycarboxyliques, qui soit performante, non onéreuse et écologique. Pour cela, nous avons choisi l’acide citrique (AC) comme étant l’élément actif de la recette qui est à base de 5% d’AC et d’un mélange de catalyseurs : hypophosphite de sodium / cyanamide (1 éq ; 0,75 : 0,25). La température et le temps de réticulation ont été optimisés respectivement à 170°C et 90 s. L’infroissabilité ainsi conférée peut être estimée au mieux à assez bonne. En contrepartie, ce traitement infroissable engendre une dégradation de la résistance à la traction et du degré de blanc du support. Des supports de coton traités avec la recette optimale et éventuellement d’autres recettes ont été caractérisés par différentes méthodes analytiques. Les résultats trouvés montrent que la réaction d’estérification de la cellulose avec l’AC se produit principalement dans la paroi cellulaire et non pas en surface des fils de coton. En outre, le degré de polymérisation de la cellulose traité chute de 60%, ce qui est en accord avec les mesures dynamométriques déjà réalisées
This work is divided into two parts: a papermaking part and a textile one. In the first part, new and if possible ‘green’ products, which can improve paper wet-strength, have been designed. For this purpose, unsaturated quaternary ammonium salts (SAQs), many of them unpublished so far, were synthesized. These salts were then polymerized using a microwave reactor. The resulting (co)polymers are cationic, water-soluble and amphiphilic. We demonstrated that papers, once treated by an amphiphilic N,N-diallyl-pyrrolidinium-based copolymer and carboxymethylcellulose (CMC) via a bi-layer treatment, were endowed with an obvious hydrophobic character. Moreover, other copolymers synthesized from N,N-diallyl-3-hydroxy-azetidinium (CDAHA) were able to impart to paper sheet a wet-strength comparable to that usually provided by polyamide-amine-epichlorohydrin (PAE) resins. The second part of the present work is dedicated to the development of an optimal anti-wrinkle recipe for cotton fabrics based on polycarboxylic acids. This recipe should be ideally efficient, cheap and eco-friendly. For that goal, citric acid (CA) was used as the active medium of the recipe that was based on 5% aq AC (w/w) solution and a catalyst mixture: sodium hypophosphite / cyanamide (1 eq, 0.75, 0.25). Temperature and heating duration was respectively optimized at 170°C and 90 s. Resulting crease-resistant properties can be estimated at best to good. However, such an anti-wrinkle treatment causes a degradation of both tensile strength and whiteness index. Cottons treated with the optimum recipe and other recipes were characterized by different analytical methods. Data showed that esterification reaction of cellulose with AC occurs mainly in the cell wall and does not affect the yarn surface. In addition, polymerization degree of treated cellulose was reduced of 60% in accordance with already measured mechanical properties

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Owens, Gary. "Nitrate selective resins : interaction of monomeric and polymeric quaternary ammonium compounds with nitrates /." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09pho97.pdf.

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Daudet, Elodie. "Synthèse, caractérisation et propriétés biocides de polysiloxanes porteurs de fonctions ammonium quaternaire laterales." Paris 13, 1997. http://www.theses.fr/1997PA132005.

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Des polysiloxanes porteurs de fonctions ammonium quaternaire (aq) ou phosphonium quaternaire ont été synthétisés pour être incorporés dans des mastics a base de silicone et leur conférer des propriétés biocides. Deux voies de synthèse partant d'un copolymère poly(dimethylsiloxane-comethylhydrogenosiloxane) ont été utilisées. Les fonctions silane du copolymère permettent de greffer par réaction d'hydrosilylation des alcènes terminaux -halogènes. Dans le cas du bromobutene, nous avons pu quaterniser les groupes latéraux du polysiloxane par la n,n-dimethyloctylamine ou la tri-n-butylphosphine. Pour des raisons de cout, nous avons envisage une autre voie de synthèse dans laquelle on greffe par hydrosilylation sur le polysiloxane des fonctions époxyde. Celles-ci sont ensuite ouvertes par une amine secondaire puis les amines tertiaires résultantes sont quaternisées par un dérivé halogène. Les différents copolysiloxanes synthétisés ont été incorpores dans des mastics. Leurs propriétés fongicides (aspergillus niger) et bactéricides (Escherichia coli) ont été déterminées grâce a un test de dénombrement des microorganismes survivants après contact avec un échantillon de mastic et un test d'envahissement qui permet d'évaluer l'activité d'un mastic faiblement concentre et l'éventuelle diffusion de produits biocides. Nous avons examine l'influence des substituants de l'AQ, de la composition du copolymère et de sa concentration dans le mastic, et mis au point un test de vieillissement accélère qui a permis de montrer que l'additif, n'étant pas fixe au réseau polysiloxanique et étant de nature très flexible et hydrophile, diffusait lentement dans l'eau. Ce sont donc des mastics antifongiques à relargage contrôlé. Les propriétés biocides des mastics formules avec ces polysiloxanes à substituants AQ sont nettement plus durables que celles des mastics commerciaux actuels. Elles sont comparables à celles de polymères biocides par contact précédemment développés au laboratoire

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Sadiq, Lubna. "Characterisation of a chitosan based polymer Quaternary ammonium palmitoyl glycol chitosan for drug and gene delivery." Thesis, University of Strathclyde, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273428.

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Com, Dominique. "Contribution à l'étude de la réaction de polycondensation phénol-epoxy par catalyse par transfert de phase." Paris 6, 1986. http://www.theses.fr/1986PA066031.

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Book chapters on the topic "Quaternary ammonium polymers"

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Gooch, Jan W. "Quaternary Ammonium Compound." In Encyclopedic Dictionary of Polymers, 919. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_14628.

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Gooch, Jan W. "Quaternary Ammonium Compound." In Encyclopedic Dictionary of Polymers, 602. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9688.

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Hunkeler, D., A. E. Hamielec, and W. Baade. "The Polymerization of Quaternary Ammonium Cationic Monomers with Acrylamide." In Polymers in Aqueous Media, 175–92. Washington, DC: American Chemical Society, 1989. http://dx.doi.org/10.1021/ba-1989-0223.ch010.

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Farah, Shady. "Chapter 10. Antimicrobial Quaternary Ammonium Polymers for Biomedical Applications." In Biomaterials Science Series, 277–302. Cambridge: Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/9781788012638-00277.

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Tsai, Tsung-Han, Craig Versek, Michael Thorn, Mark Tuominen, and E. Bryan Coughlin. "Block Copolymers Containing Quaternary Benzyl Ammonium Cations for Alkaline Anion Exchange Membrane Fuel Cells (AAEMFC)." In Polymers for Energy Storage and Delivery: Polyelectrolytes for Batteries and Fuel Cells, 253–65. Washington, DC: American Chemical Society, 2012. http://dx.doi.org/10.1021/bk-2012-1096.ch015.

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Grigoras, Anca Giorgiana. "Polymeric Antimicrobials with Quaternary Ammonium Moieties." In Sustainable Agriculture Reviews, 123–70. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58259-3_5.

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"Quaternary ammonium compound." In Encyclopedic Dictionary of Polymers, 807. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_9508.

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Itsuno, S., and N. Haraguchi. "Benzylation of -(Diphenylmethylene)glycine -Butyl Ester Using Main Chain Chiral Cinchona Alkaloid Quaternary Ammonium Salt Polymers." In Brønsted Base and Acid Catalysts, and Additional Topics, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00518.

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Dixit, Sharad G., and Ajay K. Vanjara. "Adsorption of Quaternary Ammonium Compounds at Polymer Surfaces." In Polymer Interfaces and Emulsions, 373–407. CRC Press, 2020. http://dx.doi.org/10.1201/9781003064978-9.

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Dixit, Sharad G., and Ajay K. Vanjara. "Adsorption of Quaternary Ammonium Compounds at Polymer Surfaces." In Polymer Interfaces and Emulsions, 373–407. CRC Press, 2020. http://dx.doi.org/10.4324/9781003064978-9.

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Conference papers on the topic "Quaternary ammonium polymers"

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Hassan, Mervat S., Hassan El-Shall, and Chearly Beaty. "Some Aspects on Thermal Degradation of Organo-Layer Silicates." In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47038.

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Naturally occurring silicates, like montmorillonite (MMT) have received much attention as reinforcement materials for polymers because of their potentially high aspect ratio and unique intercalation (exfoliation) characteristic. Montmorillonite is of particular interest because it has a layered structure typically about 1nm in thickness and a high aspect ratio ranging from 100 to 1500 that, with proper exfoliation, can lead to platelets with high stiffness and strength dispersed in the polymer matrix. In this paper, we studied the delamination of Egyptian bentonite and Cloisite Na+ (USA) using different onium ions. The organo-clays were characterized by X-ray diffraction (XRD), Differential Scanning Calorimeter (DSC), Derivativethermogravimetry (TGA), Thermogravimetry (TG), and Infrared spectroscopy (IR). Understanding the relationship between molecular structure of the modifying surfactant and the thermal stability of the organically modified layered silicates is critical to its processing and subsequent applications. Therefore, special emphasis is given to the study of the thermal degradation of the modified clays. The results of the thermal degradation of montmorillonite (MMT) and alkyl quaternary ammonium montmorillonite (OMMT) are discussed in this paper.

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