Performances and working mechanism of a novel polycarboxylate superplasticizer synthesized through changing molecular topological structure

Liu, Xiao; Guan, Jianan; Lai, Guanghong; Wang, Ziming; Zhu, Jie; Cui, Suping; Lan, Mingzhang; Li, Huiqun

doi:10.1016/j.jcis.2017.05.025

Cited by 80 publications

(46 citation statements)

References 90 publications

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“…1 H‐NMR and 13 C‐NMR spectra of SPCE3‐SM are shown in Figures and , respectively. The 1 H‐NMR spectra shows signals at δ (4.5–5.0) and δ (3.3–3.8) corresponding to the H atoms of poly(ethylene glycol) in the side chain of arm structure . δ (1.34–1.88) correspond to the H atoms of (CH 2 ) in arm structure.…”

Section: Resultsmentioning

confidence: 86%

“…13C‐NMR spectra shows signals at δ (170–180) corresponding to the C atom of carboxyl group. Signals at δ (181–183) corresponding to the C atom of ester group from star‐shaped “core” for the SPCE sample and peak at δ 63 corresponding to the C atoms of CH 2  linked to arm structure. All of the above results confirm the acquisition of expected polymerization product with star‐shaped structure.…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, when it comes to cement workability (including water‐reducing rate, fluidity, and especially fluidity retention), the performance of comb‐shaped PCEs cannot meet the demands of concrete industry in certain regards . Superplasticizers often exhibit a comb‐shaped structure, which has currently become considered as the universal structure of these materials . The research direction is whether there are other new types of molecular structure contributing to higher effectiveness.…”

Section: Introductionmentioning

confidence: 99%

“…The research direction is whether there are other new types of molecular structure contributing to higher effectiveness. Current researches on the molecular design of PCEs has mainly focus on traditional comb‐shaped structure but scarcely on star‐shaped structure. Star‐shaped polymers could have a different molecular topological structure contributing to PCEs' dispersion effect and other cement workability.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Regulating the arm structure of star‐shaped polycarboxylate superplasticizers as a means to enhance cement paste workability

Zhao

Nian

Pang

et al. 2018

J of Applied Polymer Sci

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Star-shaped superplasticizers, which incorporated polyol ester with unsaturated bond at their cores and bore comb-type structures as their arms were synthesized via esterification-copolymerization in aqueous phase from pentaerythritol, acrylic acid (AA), and isopentenyl oxy poly(ethylene glycol ether) (TPEG). The monomer ratios of AA and TPEG were varied and comonomer sodium methallyl sulfonate (SMAS) bearing short side chains was added to regulate the arm structure of star-shaped polycarboxylate superplasticizers (SPCEs). The effects of the SPCEs on cement paste were investigated and the cement dispersion as well as early hydration mechanism were explored. As a main result, SPCEs with SMAS and certain molar ratios for anchoring groups and PEO side-chains in their arm structure exhibited good paste dispersion and fluidity retention, which also delayed the early hydration process and prolonged both the initial and the final setting time.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Regulating the arm structure of star‐shaped polycarboxylate superplasticizers as a means to enhance cement paste workability

Zhao

Nian

Pang

et al. 2018

J of Applied Polymer Sci

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“…Four reactants such as TPEG-2400, TPEG-1000, MAS, and wheat straw were chosen to optimize the components because they were the main ingredients that a ect the product performance as well as the cost [22,23]. Table 1 describes the orthogonal experimental design for nine trials with three levels of concentrations for each reactant components' variable and corresponding cement uidity.…”

Section: Optimization Of Reactants For Pcs Productionmentioning

confidence: 99%

Research on Wheat Straw Application in the Preparation of Superplasticizer

Guo

Zhu

Gao

et al. 2018

Advances in Materials Science and Engineering

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Wheat straw was utilized in the preparation of polycarboxylate superplasticizer (PCS) to improve its performance as well as to reduce the production cost in this paper. e addition time and pretreatment time of wheat straw in the production of PCS were detected. Orthogonal experimental design was adopted to optimize the components of reactants, and the adding time of the initiator was also examined. e PCS produced with wheat straw in this paper kept a rather high water-reducing rate. In addition, the results of some physical characteristics showed there were no obvious differences between the PCS produced with and without wheat straw, while the PCS produced with wheat straw had the longer time of coagulation. At the same time, infrared spectrum implied that the addition of wheat straw made the side chain more abundant and had little influence on the main chain of the large molecules.

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Synthesis and characterization of a PAMAM dendrimer‐based superplasticizer and its effect on the properties in cementitious system

Zhao

Liao

Nian

et al. 2018

J of Applied Polymer Sci

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In this work, a polyamidoamine dendrimer-based polycarboxylic superplasticizer (DPC) with a crosslinked emanative structure was synthesized via simple free radical polymerization. 1 H-nuclear magnetic resonance and Fourier transform infrared spectroscopy measurements were used for structural characterization. The fluidity, rheology behavior, and compressive strength of the cement/DPC samples were investigated in detail. The DPCs performed better dispersion and dispersion maintaining capabilities, stronger water reduction capability, and higher adsorption amounts than the conventional comb-shaped superplasticizer. The dispersive capacity of the DPC increased with an increasing generation of polyamidoamine dendrimers. Besides, compared with conventional comb-shaped superplasticizer, the addition of DPC led to a delayed and lowered heat flow peak on the hydration of cement paste at early age of hydration process. Furthermore, compressive strength results showed that the cement/DPC samples performed higher compressive strength than blank cement samples.

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Performances and working mechanism of a novel polycarboxylate superplasticizer synthesized through changing molecular topological structure

Cited by 80 publications

References 90 publications

Regulating the arm structure of star‐shaped polycarboxylate superplasticizers as a means to enhance cement paste workability

Regulating the arm structure of star‐shaped polycarboxylate superplasticizers as a means to enhance cement paste workability

Research on Wheat Straw Application in the Preparation of Superplasticizer

Synthesis and characterization of a PAMAM dendrimer‐based superplasticizer and its effect on the properties in cementitious system

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