Polycarboxylate superplasticizers of acrylic acid–isobutylene polyethylene glycol copolymers: monomer reactivity ratios, copolymerization behavior and performance

Zhang, Zhaosheng; Wang, Ziwei; Ren, Jianguo; Pei, Jikai

doi:10.1007/s13726-016-0446-4

Cited by 11 publications

(9 citation statements)

References 32 publications

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“…So, we concluded that IPEG2400 showed higher copolymerization activity with acrylic acid than HPEG2400. According to the former work of our research team, the testing reactivity ratio of acrylic acid and IPEG2400 are r AA = 1.131 and r IPEG = 0.042 . The testing reactivity ratio of acrylic acid and HPEG2400 is r AA = 1.54 and r HPEG = 0 .…”

Section: Resultsmentioning

confidence: 95%

Synthesis of polycarboxylate superplasticizers using an acrylic acid‐rich wastewater from acrolein production

et al. 2017

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In this paper, an acrylic acid-rich wastewater from the production of propylene to acrolein was used to synthesize the polycarboxylate superplasticizers. First, the acrylic acid-rich wastewater was oxidized. Then, two kinds of unsaturated polyether macromonomers {methallyl polyethylene glycol (HPEG) and isoprenol polyethylene glycol (IPEG)} and the oxidized wastewater were copolymerized with it, respectively, by free radical polymerization in aqueous solution. The monomer conversion, molecular weight, molecular weight distribution of the copolymers of gel permeation chromatography (GPC) were characterized. The performance of the two copolymers was characterized by measuring paste flow, adsorption using GPC method, and the applied behavior of premixed concrete. The results showed that the synthesized copolymers could meet the requirement of application in contrast to the commodity product. K E Y W O R D Sacrylic acid-rich wastewater, adsorption, copolymer, macromonomers, polycarboxylate superplasticizer How to cite this article: Pei J, Wang Z, Ren J, Liu D. Synthesis of polycarboxylate superplasticizers using an acrylic acid-rich wastewater from acrolein production.

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Section: Resultsmentioning

confidence: 95%

Synthesis of polycarboxylate superplasticizers using an acrylic acid‐rich wastewater from acrolein production

et al. 2017

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“…According to the monomer reactivity rate, the relationship between copolymer composition and conversion rate is analyzed in the reaction systems. The specific calculation is shown in eq . ,, C = M 0 − M M 0 = 1 − M M 0 = 1 − true( f 1 f 1 0 true) ϕ true( f 2 f 2 0 true) β true( f 1 0 − δ f 1 − δ true) γ where is ϕ = r 2 1 − r 2 , β = r 1 1 − r 1 , δ = 1 − r 2 1 − r 2 − r 2 , γ = 1 − r 1 r 2 false( 1 − r 1 false) false( 1 − r 2 false) ...…”

Section: Resultsmentioning

confidence: 99%

“…The specific calculation is shown in eq 9. 28,52,53 = = = i k j j j j j j y { z z z z z z i k j j j j j j y { z z z z z z i k j j j j j j y…”

Section: Compressive Strength Of Concretementioning

confidence: 99%

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Zhou,

Li,

Duan

et al. 2024

ACS Appl. Polym. Mater.

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Polycarboxylate superplasticizers (PCEs) prepared by traditional free radical initiation methods need to use chemicals as initiators, which are environmentally unfriendly. In contrast, photoinitiation offers an ecofriendly and sustainable alternative. In our work, PCEs are successfully synthesized by photoinitiated radical polymerization without photoinitiators using ethylene glycol monovinyl polyethylene glycol (EPEG) and acrylic acid (AA) as monomers. The structure and properties of PCEs synthesized by photoinitiation and conventional redox initiation are studied, and the influence mechanism is discussed. The molecular weight distribution of photopolymerized PCE (LPCE) is narrower, and the constructed molecular structure is closer to the theoretical design. Therefore, the adsorption capacity and adsorption layer thickness of LPCE are increased on cement, which significantly improves the dispersion performance of cement paste, reduces the viscosity of paste, and enhances the compressive strength of concrete. Moreover, the reactivity ratios of EPEG and acrylic acid (AA) under photoinitiation are r EPEG = 0.0299 and r AA = 2.6215, and those of redox initiation are r EPEG ′ = 0.0126 and r AA ′ = 5.0096 via the Yezrielev−Brokhina−Roskin (YBR) method, proving that photoinitiation increases the reactivity ratio of EPEG and weakens the self-polymerization tendency of AA. This study provides a simple photoinitiated method for the synthesis of PCEs, which could potentially offer greater environmental friendliness.

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“…This makes these macromonomers notably less reactive, being kinetically more similar to vinyl ethers . In copolymerization reactions with acrylic acid and methacrylic acid, a major difference in reactivity ratios has been observed, making it difficult to produce homogeneous copolymer chains. ,− …”

Section: Introductionmentioning

confidence: 99%

“…Open literature about the reactivity ratios of these types of macromonomers is very scarce. In fact, the results are limited to a couple of sources available. ,, So far, three of these macromonomers have been studied together with acrylic acid. These are polyethylene glycol monovinyl ether (EPEG), polyethylene glycol 3-methyl-3-butenyl ether (IPEG), and polyethylene glycol 2-methyl-2-propenyl ether (HPEG).…”

Section: Introductionmentioning

confidence: 99%

Acidic Aqueous-Phase Copolymerization of AA and HPEG Macromonomer: Influence of Monomer Concentration on Reactivity Ratios

Palma-Lemus,

Hamzehlou,

Froidevaux

et al. 2023

Ind. Eng. Chem. Res.

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Poly(acrylic acid-co-polyethylene glycol 2-methyl-2-propenyl ether) copolymers are comb-like water-soluble copolymers produced by the copolymerization of acrylic acid (AA) and polyethylene glycol 2-methyl-2-propenyl ether (HPEG). The main application of these copolymers is as superplasticizers for cementitious materials, also known as polycarboxylate ethers (PCE’s). The kinetics of the water-soluble monomers is substantially more complex than that of non-water-soluble monomers as their kinetics depend on various parameters such as monomer concentration, pH, and ionic strength. In this work, aqueous in situ 1H NMR copolymerizations of AA and HPEG at different initial overall monomer weight fractions and comonomer molar ratios under acidic media were carried out. The gathered kinetic data were used for the estimation of the reactivity ratios of AA-HPEG. A nonlinear least-squares (NLLSQ) method based on the Mayo–Lewis composition equation was used to estimate the reactivity ratios by fitting the cumulative copolymer composition or free monomer molar fraction as a function of overall monomer conversion. The estimation indicates that the reactivity ratio of acrylic acid is higher than that of the HPEG monomer, which is estimated as close to zero. In addition, the reactivity ratio of AA depends on the overall monomer weight fraction; the higher the initial overall monomer concentration, the higher the reactivity ratio is. An empirical expression is derived that describes the dependency of the reactivity ratio of AA on the overall monomer mass fraction (r AA = 1.76 (±0.062) + 0.0275 (±4.37 × 10–3) w M (%); r HPEG = 2.3 × 10–14 (±6.02 × 10–3)).

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Polycarboxylate superplasticizers of acrylic acid–isobutylene polyethylene glycol copolymers: monomer reactivity ratios, copolymerization behavior and performance

Cited by 11 publications

References 32 publications

Synthesis of polycarboxylate superplasticizers using an acrylic acid‐rich wastewater from acrolein production

Synthesis of polycarboxylate superplasticizers using an acrylic acid‐rich wastewater from acrolein production

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Acidic Aqueous-Phase Copolymerization of AA and HPEG Macromonomer: Influence of Monomer Concentration on Reactivity Ratios

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