Study of cement mortars modified by emulsifier-free latexes

Wang, Jingang; Zhang, Shuxiang; Yu, Haiqin; Kong, Xiang Zheng; Wang, Xikui; Gu, Zhongmao

doi:10.1016/j.cemconcomp.2005.05.005

Cited by 33 publications

(10 citation statements)

References 6 publications

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“…where W Ca(OH) 2 is the content of Ca(OH) 2 , WL Ca(OH) 2 is the weight loss by dehydration of Ca(OH) 2 , MW Ca(OH) 2 is the molar weight of Ca(OH) 2 and MW H 2 O is the molar weight of water. The content of dehydrated Ca(OH) 2 in SPM cured for 28 days with the content of SP.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4] In general, polymer modiers, which exist in the form of latex, liquid, or powder, emulsify or get dispersed when mixing with cement or water, leading to a protective polymer layer. [1][2][3][4] In general, polymer modiers, which exist in the form of latex, liquid, or powder, emulsify or get dispersed when mixing with cement or water, leading to a protective polymer layer.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of a new cement-based composite with sulfur polymer

Kwon

Noh

et al. 2015

RSC Adv.

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The addition of sulfur polymer (SP) and the resulting effects on the hydration and physical properties of polymer-cement mortars were investigated. Sulfur polymer-cement mortars (SPMs) with 5 wt%, 10 wt%, and 20 wt% of SPs were prepared to evaluate the compressive strength and impermeability in comparison to ordinary Portland cement mortars (PCMs). After curing for 28 days, the compressive strength of SPM with 5 wt% of SP increased by approximately 8.0% compared to PCM by hardened SP binder as well as proper hydration of hydrates. The impermeability of SPMs cured for 28 days was two times higher than that of PCM cured for the same period. The outstanding enhancement of the compressive strength and impermeability are attributed to SP additive formed inside the hydrated cement. † Electronic supplementary information (ESI) available: SEM images, schematic illustration, chemical composition and physical properties of Portland cement, experimental variable, and content of dehydrated calcium hydroxide. See

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a new cement-based composite with sulfur polymer

Kwon

Noh

et al. 2015

RSC Adv.

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“…5) during emulsion polymerization and spray‐drying processes that use PVA polymer as a surfactant (Table 3). 23–25…”

Section: Resultsmentioning

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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“…5), fine carbon particles adhered to flaky crystals, separating the hydrated layer. The opposite action of surfactants such as OP was to disperse the cement for diffuse hydration [25]. In POP, the formation of smaller and more uniform flake crystals was due to the dispersing of the hydraulic binding agent by OP [26].…”

Section: Single-factor Modificationmentioning

confidence: 99%