Effects of the Carboxyl Density on the Properties of Polycarboxylate-Type Superplasticizer

2014 ◽  
Vol 989-994 ◽  
pp. 151-155
Author(s):  
Cheng Fei Fu ◽  
Guang Jun Zheng ◽  
Kang Ling Li ◽  
Yao Bi ◽  
Long Xiong
Keyword(s):  
Molecular Weight ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Acrylic Acid ◽  
Weight Distribution ◽  
High Performance ◽  
Gel Permeation Chromatography ◽  
Monomer Conversion ◽  
Cement Pastes ◽  
Gel Permeation

The effect of carboxyl density (the ratio of acrylic acid and polyoxyethylene ether) upon the performance, molecular weight, and monomer conversion rate of polycarboxylate (PCE) were investigated by slump test, Gel Permeation Chromatography (GPC) and High Performance Liquid Chromatography (HPLC), respectively. The results showed that with carboxyl density increased from 2:1 to 7:1, molecular weight of PCE increased from 7968.5 to 13930.1 and the molecular weight distribution coefficient increased from 1.5 to 2. The HPLC date indicated carboxyl density does not affect the rate of monomer conversion. Test of the fluidity of cement pastes displayed that as carboxyl density was 4.0:1, PCE show the optimal dispersion and dispersion-retaining ability.

Effect of Sodium Methylacrysulfonate upon the Molecular Weight and Performance of Polycarboxylate Superplasticizer

2014 ◽  
Vol 989-994 ◽  
pp. 91-96
Author(s):  
Long Xiong ◽  
Guang Jun Zheng ◽  
Yao Bi ◽  
Cheng Fei Fu ◽  
Shao Feng Wang
Keyword(s):  
Molecular Weight ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Gel Permeation Chromatography ◽  
Monomer Conversion ◽  
Cement Pastes ◽  
Cubic Equation ◽  
Gel Permeation ◽  
And Performance

The effect of sodium methylacrysulfonate (SMAS) upon the molecular weight, molecular weight distribution and polycarboxylate (PCE)’s dispersion and dispersion-retaining ability were investigated by Gel permeation chromatography (GPC) and test of the fluidity of cement pastes. The results showed that the dosage of SMAS was inversely proportional to the molecular weight of polycarboxylate, and a cubic equation relationship existed between the molecular weight of the polycarboxylate and the reciprocal of SMAS dosage. There was an optimum middle dosage of sodium methylacrysulfonate which could control the molecular weight polycarboxylate, and then affect its dispersion and dispersion maintain performance. The effect of sodium methylacrysulfonate on the monomer conversion rate was also systematically discussed by means of high performance liquid chromatography (HPLC).

Analysis of 188Re-EDTMP complexes by HPLC and ultrafiltration

2004 ◽  
Vol 92 (4-6) ◽  
Author(s):  
Kazuyuki Hashimoto ◽  
Hiromitsu Matsuoka
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Anion Exchange ◽  
High Performance ◽  
Gel Permeation Chromatography ◽  
Reversed Phase ◽  
Ion Pair ◽  
Gel Permeation

AbstractHigh performance liquid chromatography (anion-exchange, reversed-phase ion-pair and gel permeation chromatography) and ultrafiltration have been employed to analyze

scholarly journals Chromatographic characterization of products isolated from chrome shavings

1999 ◽  
Vol 42 (3) ◽  
pp. 281-290
Author(s):  
Edivaldo E Garcia ◽  
Cláudia C.M Kimura ◽  
Ariovaldo C Martins ◽  
Gisele O Rocha ◽  
Jorge Nozaki
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Chemical Characterization ◽  
Gel Permeation Chromatography ◽  
Gel Permeation ◽  
Chromatographic Characterization ◽  
Free Aminoacids

Gel permeation chromatography and high performance liquid chromatography were employed for separation and chemical characterization of products isolated from chrome shavings. After enzymatic hydrolysis, the products isolated were peptides of higher molecular weight. Peptides of lower molecular weight and free aminoacids were the main products using sulfuric acid in chrome shavings solubilization. Glycine (17%) , glutamic acid (10.6%) , alanine (9.2%) , and arginine (8.2%) were the principal amino acids found. Phenylalanine(1.8%) was the main aromatic amino acid , while tryptophane was completely absent.

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