Synthesis of Polycarboxylate Superplasticizer with β-Cyclodextrins as Side Chain

2012 ◽  
Vol 455-456 ◽  
pp. 606-611
Author(s):  
Sheng Hua Lv ◽  
Rui Jun Gao ◽  
Di Li
Keyword(s):  
Side Chain ◽  
Polycarboxylate Superplasticizer

Synthesis and Effect of Polycarboxylate Superplasticizer with Two Different Molecular Polyethers as Side Chain

2012 ◽  
Vol 217-219 ◽  
pp. 578-581
Author(s):  
Shao Hu Zou ◽  
Wu Biao Duan ◽  
Xin Wang ◽  
Zhen Long Gao ◽  
Bo Liu
Keyword(s):  
Water Consumption ◽  
Reducing Agent ◽  
Side Chain ◽  
Side Chains ◽  
Polycarboxylate Superplasticizer ◽  
Single Side ◽  
Concrete Admixtures ◽  
Main Effect

Water-reducing agent was one of the most important concrete admixtures. Its main effect is to reduce the unit water consumption of concrete, increase strength, but also help to improve the durability, make it easy-to-mix. Water reducer has gone to polycarboxylate superplasticizer which has single side chain generally. A kind of new water reducer by choosing 2500 and 600 molecular polyethers as the side chains has the higher water-reducing effect than the traditional one. It is more than 26 on fluidity retention in 2 hours.

scholarly journals Study on adsorption, rheology and hydration behaviours of Polycarboxylate(PCE) superplasticizer synthesized by different acid to ether ratio

2021 ◽  
Vol 2133 (1) ◽  
pp. 012007
Author(s):  
Zhijun Lin ◽  
Xiaofang Zhang ◽  
Zhanhua Chen ◽  
Yue Xiao ◽  
Yunhui Fang
Keyword(s):  
Molecular Weight ◽  
Adsorption Capacity ◽  
Cement Paste ◽  
Cement Hydration ◽  
Main Chain ◽  
Chain Structure ◽  
Hydration Process ◽  
Side Chain ◽  
Structure Parameters ◽  
Polycarboxylate Superplasticizer

Abstract Polycarboxylate superplasticizer is synthesised by different acid to ether ratio, which is changing the main chain structure parameters, obtained different microstructures. The effect of different microstructure PCE superplasticizer on the fluidity of cement paste, rheological thixotropy, adsorption capacity and hydration heat are studied. The results show that dispersing performance in cement with acid to ether ratio of 3.5 is the best, the molecular weight and side chain density have rather little effect on the cement hydration process.

Relationship between Structure and Performance of Polycarboxylate Superplasticizer

2012 ◽  
Vol 509 ◽  
pp. 57-64
Author(s):  
Zi Ming Wang ◽  
Zi Chen Lu ◽  
Fang Lu ◽  
Hui Qun Li
Keyword(s):  
Chain Length ◽  
Density Functional ◽  
Functional Group ◽  
Degree Of Polymerization ◽  
Side Chain ◽  
Side Chain Length ◽  
Existing Problems ◽  
Polycarboxylate Superplasticizer ◽  
And Performance ◽  
The Relationship

The structure of the polycarboxylate superplasticizer (PCE) and the relationship between the structure and the performance of PCE were summarized and analyzed. Based on these results achieved so far, the consensus and the unified opinions were presented while the ambiguous and contradictory points were compared and discussed. Furthermore, the different effect on performance caused by different structure such as side chain length, degree of polymerization, side chain density, functional group were discussed systematically. Finally the existing problems and the measures to be taken in the future were proposed

Effect of Structure of Polycarboxylate Superplasticizer on Hydration of Cement in Early Period

2012 ◽  
Vol 487 ◽  
pp. 24-28
Author(s):  
Jian Ping Duan ◽  
Sheng Hua Lv
Keyword(s):  
Cement Paste ◽  
Setting Time ◽  
Early Period ◽  
The Other ◽  
Side Chain ◽  
Carboxyl Groups ◽  
Structure Parameters ◽  
Polycarboxylate Superplasticizer ◽  
Hydrated Product ◽  
Effect Of Structure

Effect of polycarboxylate superplasticizer (PCs) with different bond between side chain and truck chain on hydration of cement in early period was studied. The performance of PCs in concrete was investigated by setting time, TGA and SEM. PC-based superplasticizer with ester bonding between side chain and truck chain. Although they had the proximate structure parameters in density of side chain and absorption group (carboxyl groups), the setting time of cement paste was significantly different when different PCs were employed in the preparation of cement. Decomposing of this bond in alkali environment may lead to a shorter setting time. On the other hand, same difference in hydration production was observed in early period hydration of cement paste when two different PCs was incorporated, which indicated that the different bond structure in PCs affected the hydration of cement in a different manner. The result of SEM indicated that the morphological phase of hydrated product was different when PC was applied, this may be related with the different result in the TG and TGA

scholarly journals The influence of the structural parameters of polycarboxylate superplasticizer on the dispersion and adsorption

2021 ◽  
Vol 2133 (1) ◽  
pp. 012011
Author(s):  
Shaohong Zhu ◽  
Yanmei Lin ◽  
Yunhui Fang ◽  
Yuliang Ke ◽  
Huazhen Lai ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Conversion Rate ◽  
Molecular Design ◽  
Raw Materials ◽  
Structural Parameters ◽  
Average Molecular Weight ◽  
Synthesis Process ◽  
Side Chain ◽  
Weight Average Molecular Weight ◽  
Polycarboxylate Superplasticizer

Abstract Polycarboxylate superplasticizers with different structural parameters were synthesized by isobutylene polyoxyethylene ether, acrylic acid and ammonium persulfate as raw materials from the perspective of molecular design. The influence of polycarboxylate superplasticizer on cement adsorption was characterized by cement adsorption capacity test and fluidity test, etc. At the same time, the adsorption change of polycarboxylate superplasticizer on the surface of cement particles was also revealed. It was found that the best adsorption and dispersion properties on cement paste were obtained under the heating synthesis process when the structure of the water reducing agent was designed to have a weight average molecular weight of 55128, a macromonomer conversion rate of 84.61%, and a side chain density of 0.1725. For the normal temperature process, when the weight average molecular weight was 103920, the macromonomer conversion rate 92.03%, and the side chain density 0.3115, the best effects in cement can be achieved.

Synthesis of Polycarboxylate Superplasticizer with β-Cyclodextrins as Side Chain

2012 ◽  
Vol 455-456 ◽  
pp. 606-611
Author(s):  
Sheng Hua Lv ◽  
Rui Jun Gao ◽  
Di Li
Keyword(s):  
Maleic Anhydride ◽  
Ammonium Persulfate ◽  
Radical Copolymerization ◽  
Molar Ratio ◽  
Side Chain ◽  
Vinyl Monomers ◽  
Feeding Mode ◽  
Molar Ratios ◽  
Polycarboxylate Superplasticizer ◽  
Effect Of Feeding

A new polycarboxylate superplasticizer (NPC) was synthesized by radical copolymerization of maleic anhydride (MAH), sodium methylacryl sulfonate (MAS), allyl polyethylene glycols (APEG), and β-cyclodextrins grafted maleic anhydride (MAH-β-CD) using ammonium persulfate (APS) as initiator. The effect of feeding mode and molar ratio of monomers, contents of MAH-β-CD and reaction temperature on fluidity was discussed. The results show that the excellent properties of NPC were obtained when molar ratios of MAH, MAS, APEG and MAH-β-CD were 2.5: 0.5 : 1 : 0.1 in the presence of 1 mol% APS of all molar of vinyl monomers at 90 °C for 5 h. Meanwhile, the molecular structure was characterized by FTIR spectrum.

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