Effect of molecular structure of maleic anhydride, fumaric acid – Isopentenyl polyoxyethylene ether based polycarboxylate superplasticizer on its properties in cement pastes

2021 ◽  
Vol 308 ◽  
pp. 125143
Author(s):  
Shengnan Sha ◽  
Yanrong Zhang ◽  
Yihan Ma ◽  
Yi Liu ◽  
Caijun Shi
Keyword(s):  
Molecular Structure ◽  
Maleic Anhydride ◽  
Fumaric Acid ◽  
Cement Pastes ◽  
Polyoxyethylene Ether ◽  
Polycarboxylate Superplasticizer

Synthesis, Cement Paste Fluidities and Molecular Weight Measurements of Polycarboxylate Superplasticizer by Bulk Polymerization

2013 ◽  
Vol 405-408 ◽  
pp. 2778-2781
Author(s):  
Xiao Liu ◽  
Zi Ming Wang ◽  
Xu Liang ◽  
Jie Zhu ◽  
Jue Zhao
Keyword(s):  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Solid State ◽  
Maleic Anhydride ◽  
Cement Paste ◽  
Fumaric Acid ◽  
Bulk Polymerization ◽  
Synthesis Process ◽  
The Third ◽  
Polycarboxylate Superplasticizer

The synthesis process of polycarboxylate superplasticizer (PCE) by bulk polymerization was investigated. Compared with BPO as initiator, PCE prepared by using AIBN as initiator exhibited better cement paste fluidities. PCE using isopentenyl polyethylene glycol (TPEG) or isobutenyl polyethylene glycol (IPEG) as macromonomer showed excellent fluidities and retaining properties at 80°C and 75°C, respectively. The fumaric acid was more suitable to copolymerize as the third monomer than maleic anhydride. The molecular weight measurements showed that the characteristics of molecular weight and its distribution for all the synthesized samples were in accordance with their cement paste fluidities. The solid-state PCEs can be conveniently dissolved into water to prepare PCE solution with arbitrary concentration, and still with good cement application performances.

Energy Saving Preparation and Evaluation of a Novel Polycarboxylate Superplasticizer

2021 ◽  
Vol 1035 ◽  
pp. 1006-1012
Author(s):  
Xiao Liu ◽  
Xiao Fei Song ◽  
Qi Feng Luo ◽  
Chun Lei Xia ◽  
Yun Sheng Zheng ◽  
...  
Keyword(s):  
Energy Saving ◽  
Building Materials ◽  
Equation Model ◽  
Order Kinetic ◽  
The Novel ◽  
Cement Pastes ◽  
Polycarboxylate Superplasticizer ◽  
Low Emission ◽  
Potential Applications ◽  
Preparation And Evaluation

A novel polycarboxylate superplasticizer (PCE) with energy saving preparation was elaborately designed and synthesized by using acrylic acid (AA), hydroxypropyl acrylate (HPA) and isopentenyl polyethylene glycol (IPEG) as monomers. To investigate the effects of the preparation method on the effectiveness of PCE, the PCEs were prepared from energy-saving method and common method respectively, and the hydration heat evolutions of the cement pastes containing these PCEs were comparatively probed. Furthermore, the working mechanisms of the PCEs by different preparations were identified via adsorption behavior, adsorption kinetic and Zeta potential of the PCE on cement surfaces. The results showed that, this novel PCE prepared in an energy saving manner can significantly prolong the hydration process and present a stronger adsorption capacity. In addition, the adsorption of this PCE on cement surface exhibited a characteristic of pseudo first order kinetic equation model. The evaluation in energy conservation showed that, this energy saving preparation can save 1.548×104 kJ per 10 ton production. The aim of this study is to provide a new avenue to synthesize a PCE with economical method which achieves energy-saving preparation. Due to the indispensable application in construction industry, the innovations from this study contribute to the low energy-consumption production and high eco-effectiveness of the novel PCE, which has potential applications in low-emission building materials.

Preparation and Properties of Polycarboxylate Superplasticizer with Hydroxy Terminated Side Chains

2012 ◽  
Vol 455-456 ◽  
pp. 600-605
Author(s):  
Sheng Hua Lv ◽  
Jian Ping Duan ◽  
Fang Li
Keyword(s):  
Maleic Anhydride ◽  
Ethylene Oxide ◽  
Ammonium Persulfate ◽  
Molar Ratio ◽  
Side Chains ◽  
Polycarboxylate Superplasticizer ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Maleic anhydride modified polycarboxylates superplasticizes (MPC) was synthesized from allylic poly (ethylene oxide ether) (APEG), maleic anhydride (MAH), sodium methylallyl sulfonate (SMAS) using ammonium persulfate (APS) as initiator. The optimal MPC with best fluidity was got at 90 °C when molar ratio of MAH, APEG, SAMA was 2.75∶1∶0.4 in the present of 4.5 mol% APS of all the monomer molars. MPC which possessed hydroxyl terminated side chains shows some difference in fluidity retarding related to the conventional superplasticizers possessed methoxy terminated side chains.

Maleic Anhydride, Maleic Acid, and Fumaric Acid

2005 ◽  
Author(s):  
Joseph C. Burnett ◽  
Scott F. Mitchell ◽  
Michael J. Mummey
Keyword(s):  
Maleic Anhydride ◽  
Fumaric Acid ◽  
Maleic Acid

Einfache Synthese von 2,2-Diethoxy-2,5-dihydrofuranen, 2(5 H)Furanonen und 2-Ethoxy-furanen.Kristall-und Molekülstruktur eines Barrelenon Diels-Aider Produktes [1] / Convenient Synthesis of 2,2-Diethoxy-2,5-dihydrofurans, 2(5 H)Furanones and 2-Ethoxyfurans.Crystal and Molecular Structure of a Barrelenone Diels-Alder Product [1]

1994 ◽  
Vol 49 (3) ◽  
pp. 389-406 ◽  
Author(s):  
Rolf W. Saalfrank ◽  
Wieland Hafner ◽  
Joachim Markmann ◽  
Andreas Welch ◽  
Karl Peters ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Maleic Anhydride ◽  
Structure Analysis ◽  
Diels Alder ◽  
Dimethyl Acetylenedicarboxylate ◽  
Reaction Conditions ◽  
X Ray ◽  
Convenient Synthesis

AbstractReaction of 1,2-hydroxyketones 5 with (2,2-diethoxyvinylidene)triphenylphosphorane (2) or (2,2-diethoxyvinyl)triphenylphosphonium tetrafluoroborates 6 yields the 2,2-diethoxy- 2.5-dihydrofurans 9. Depending on the reaction conditions used, the orthoesters 9 can be hydrolized to give 2(5 H)furanones 10 and 2-ethoxyfurans 11, respectively. 4,5-Dimethyl- 5.6-dihydro-2-pyranone (20) and 8-methoxycoumarin (23) are prepared, starting from (2,2-diethoxyvinyl)triphenylphosphonium tetrafluoroborate (6 a) and 1-hydroxy-2-methyl- 3-butanone (16) or 2-hydroxy-3-methoxy-benzaldehyde (21). The 2-ethoxyfuranes 11 readily undergo Diels-Alder reactions with 2-chloracrylonitrile (24), maleic anhydride (26), N-phenyl-1,2,4-triazoline-3,5-dione (28) and dimethyl acetylenedicarboxylate (30) to give the corresponding Diels-Alder products 25, 27, 29 and 31, respectively. Contrary to 2-ethoxyfuran 11b , 11a reacts with two equivalents of acetylene 30, to yield barrelenone 34. The structure of 34 unequivocally is established by X-ray structure analysis.

Synthesis of Fumaric Acid-2-C14and Maleic Anhydride-2-C14 1

1952 ◽  
Vol 74 (13) ◽  
pp. 3434-3435 ◽  
Author(s):  
Robert F. Nystrom ◽  
Y. H. Loo ◽  
John C. Leak
Keyword(s):  
Maleic Anhydride ◽  
Fumaric Acid

Synthesis and Characterization on a Kind of Polycarboxylate Superplasticizer

2014 ◽  
Vol 989-994 ◽  
pp. 228-232
Author(s):  
Xing Li ◽  
Guang Jun Zheng ◽  
Yao Bi ◽  
Cheng Fei Fu ◽  
Ming Hua Yuan ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Acrylic Acid ◽  
Chain Transfer ◽  
Thioglycolic Acid ◽  
High Water ◽  
Ammonium Persulfate ◽  
Synthesis And Characterization ◽  
Polyoxyethylene Ether ◽  
Polycarboxylate Superplasticizer ◽  
Gel Permeation

This study was undertaken to evaluate a new kind of polycarboxylate superplasticizer .Used polyoxyethylene ether (TPEG), acrylic acid (AA) as the monomer, ammonium persulfate (APS) as initiator, thioglycolic acid (TGA) as chain transfer agent, synthesised polycarboxylate superplasticizer with high water reducing rate. The effect of admixtures on fluidity and concrete slump were discussed in this paper. The structure of carboxylic acid water reducing agent was characterized by IR spectra and Gel permeation chromatography.This investigation also evaluated the influence of different serials of polyoxyethylene ether (TPEG), the dosage of acrylic acid (AA) and ammonium persulfate (APS).

Preparation of Hyper-Branched Polymer and its Application in Synthetic Leather

2010 ◽  
Vol 152-153 ◽  
pp. 1894-1899
Author(s):  
Tao Tao Qiang ◽  
Min Luo ◽  
Xue Chuan Wang ◽  
Long Fang Ren
Keyword(s):  
Molecular Structure ◽  
Electron Microscope ◽  
Water Vapor ◽  
Maleic Anhydride ◽  
Moisture Absorption ◽  
Branched Polymer ◽  
Synthetic Leather ◽  
Finishing Process ◽  
Scanning Electron ◽  
Observation Results

The hyper-branched polymer with terminal carboxyl (HPAE-C) was prepared by modifying hyper-branched polymer with terminal hydroxyl with maleic anhydride. The molecular structure of HPAE-C was characterized by IR, 1H-NMR and 13C-NMR. The HPAE-C was used in the finishing process of microfiber synthetic leather, and its effect on the health properties of microfiber synthetic leather was studied. The results showed that hyper-branched polymer could improve the moisture absorption and permeability to water vapor of microfiber synthetic leather. When the dosage of HPAE-C was 8%, the permeability to water vapor and moisture absorption of microfiber synthetic leather were improved by 7% and 13%, respectively. The observation results obtained by using scanning electron microscope showed that HPAE-C could loose the fibers of synthetic leather.

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