Enhancing Polymer-Modified Mortar Adhesion to Ceramic Tile Surface by Chemical Functionalization With Organosilanes

Nascimento, Otávio Luiz do; Mansur, Alexandra A.P.

doi:10.1142/s0218625x09012391

Cited by 9 publications

(8 citation statements)

References 18 publications

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“…PE is a semi-crystalline polymer and the introduction of vinyl acetate groups reduces its degree of crystallinity due the distortion of unit cell as a consequence of the larger size of the acetoxy lateral group. 21…”

Section: Resultsmentioning

confidence: 99%

TG and DSC as tools to analyse the thermal behaviour of EVA copolymers

Díez

Rodrı́guez

Gomez

et al. 2021

Journal of Elastomers & Plastics

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This paper analyses the thermal behaviour of six EVA copolymers supplied by REPSOL Company. In relation to crystallization and melting temperatures, both of them decrease when the vinyl acetate percentage increases, in agreement with the fact that polyethylene is a semi-crystalline material, whereas polyvinylacetate is an amorphous polymer. Actually, when the vinyl acetate percentage reaches 30%, the copolymer is practically amorphous. The non-isothermal crystallization was modelled with the modified Avrami model that showed, with the exception of EVA-460 (the material with higher vinyl acetate percentage), the presence of a secondary crystallization due to spherulite impingement in the later stage of the non-isothermal crystallization. The TG analysis indicated two weight loss stages, the first one due to acetic acid loss and the second one due to fragments of polymer backbone, which appear as two separate peaks in the DTG plots. Finally, due to the linear dependence of melting and crystallization temperatures and of the minimum value of DTG peaks on vinyl acetate percentage, it can be concluded that both TG and DSC techniques can be employed to determine the vinyl acetate percentage of a certain copolymer.

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Section: Resultsmentioning

confidence: 99%

TG and DSC as tools to analyse the thermal behaviour of EVA copolymers

Díez

Rodrı́guez

Gomez

et al. 2021

Journal of Elastomers & Plastics

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“…In all cases, it was observed an increase on the mechanical properties, but the mechanism of interaction was not deeply investigated. The authors of the present study have published articles that demonstrate the increase of adherence resistance between tiles and modified mortar as a consequence of ceramic tile surface modification with silanes bearing different functionalities 10–11…”

Section: Introductionmentioning

confidence: 88%

“…The influence of the chemical functionality of the isocyanate‐trialkoxysilane coupling agent on the interfacial strength between tiles and EVA‐modified mortar was evaluated by means of pull‐off tests. Tiles were attached to a standard concrete substrate (water absorption less than 0.5 ml/4h and with minimum 28 days of age) using Portland cement mortar modified with EVA (Table 2) as described in our previous work 10, 11. A commercial EVA redispersible powder was selected (Wacker Chemie), with characteristics as presented in Table 3.…”

Section: Pull‐off Testsmentioning

confidence: 99%

A Total Synthesis of Spirastrellolide A Methyl Ester

Andrejew

Benson

Schulthoff

et al. 2013

Chemistry A European J

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A concise total synthesis of spirastrellolide A methyl ester (1 a, R(1) =Me) as the parent compound of a series of highly cytotoxic marine macrolides is disclosed, which exploits and expands the flexibility of a synthesis plan previously developed by our group en route to the sister compound spirastrellolide F methyl ester (6 a, R(1) =Me). Key to success was the masking of the signature Δ(15,16) -bond of 1 a as a C16-carbonyl group until after the stereogenic center at C24 had been properly set by a highly selective hydrogenation of the C24 exo-methylene precursor 66. Conformational control over the macrocyclic frame allowed the proper stereochemical course to be dialed into this reduction process. The elaboration of the C16 ketone to the C15-C16 double bond was accomplished by a chemoselective alkenyl triflate formation followed by a palladium-catalyzed hydride delivery. The role of the ketone at C16 as a strategic design element is also evident up-stream of the key intermediate 66, the assembly of which hinged upon the addition of the polyfunctionalized dithiane 37 to the similarly elaborate aldehyde fragment 46. Other crucial steps of the total synthesis were an alkyl-Suzuki coupling and a Yamaguchi lactonization that allowed the Northern and the Southern sector of the target to be stitched together and the macrocyclic perimeter to be forged. The lateral chain comprising the remote C46 stereocenter was finally attached to the core region by a modified Julia-Kocienski olefination. The preparation of the individual building blocks led to some methodological spin-offs, amongst which the improved procedure for the N-O-bond cleavage of isoxazolines by zero-valent molybdenum and the ozonolysis of a double bond in the presence of other oxidation-prone functionality are most noteworthy. Preliminary biological data suggest that the entire carbon framework, that is the macrocyclic core plus the lateral chain, might be necessary for high cytotoxicity.

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“…Surface chemistry is known to play an important role in influencing tribological properties. , Chemical functionalization modifies the chemical state of the surface to create functional groups. Modifying the chemical composition of a surface by the incorporation of selected functional groups or polymer brushes has led to the ability to tailor the interfacial properties of surfaces according to requirements. − …”

Section: Introductionmentioning

confidence: 99%

Adhesion and Friction Properties of Polymer Brushes on Rough Surfaces: A Gradient Approach

et al. 2013

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The effect of nanoscale surface roughness on the lubrication properties of a polymer brush in a good solvent has been investigated. Friction and adhesion forces were measured by means of polyethylene colloidal-probe AFM across a 12 nm silica particle gradient before and after the adsorption of a poly(L-lysine)-g-poly(ethylene glycol) (PLL-g-PEG) polymer brush. The adsorption and conformation of the polymer chains were studied with multiple transmission and reflection infrared (MTR-IR) spectroscopy. The results show that prior to the adsorption of PLL-g-PEG on the gradient surface, the friction is high at the smooth end of the gradient while it decreases toward the rough end. Moreover, there is a direct correlation between friction and adhesion. Upon adsorption of the brushes, adhesion vanishes. In this case, a higher frictional force between the PEG-coated particle gradient substrate and the polyethylene sphere is observed at the rough end of the gradient in comparison to the smooth end. In spite of the increased adsorbed mass of PLL-g-PEG at the rough end of the gradient, theory and simulations show that the high curvature of the nanoparticles leads to a less swollen PEG brush in comparison to PEG brushes adsorbed on a planar surface, resulting in a lower repulsion, which can explain the observed increase in friction with particle density.

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Enhancing Polymer-Modified Mortar Adhesion to Ceramic Tile Surface by Chemical Functionalization With Organosilanes

Cited by 9 publications

References 18 publications

TG and DSC as tools to analyse the thermal behaviour of EVA copolymers

TG and DSC as tools to analyse the thermal behaviour of EVA copolymers

A Total Synthesis of Spirastrellolide A Methyl Ester

Adhesion and Friction Properties of Polymer Brushes on Rough Surfaces: A Gradient Approach

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