A microstructural analysis of isoprenol ether-based polycarboxylates and the impact of structural motifs on the dispersing effectiveness

被引：68

作者：

Plank, Johann ^{[1
]}

Li, Huiqun ^{[1
,2
,4
]}

Ilg, Manuel ^{[1
]}

Pickelmann, Julia ^{[1
]}

Eisenreich, Wolfgang ^{[3
]}

Yao, Yan ^{[4
]}

Wang, Ziming ^{[2
]}

机构：

[1] Tech Univ Munich, Chair Construct Chem, Lichtenbergstr 4, D-85747 Garching, Germany

[2] Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

[3] Tech Univ Munich, Chair Biochem, Lichtenbergstr 4, D-85747 Garching, Germany

[4] China Bldg Mat Acad, State Key Lab Green Bldg Mat, Beijing 100024, Peoples R China

来源：

CEMENT AND CONCRETE RESEARCH | 2016年 / 84卷

关键词：

Admixture (D); Microstructure (B); C-13 NMR spectroscopy (B); Polycarboxylate superplasticizer; Polymers (D); SEQUENCE DISTRIBUTION; C-13; NMR; ADSORPTION; SULFATE; CHAINS; CEMENT;

D O I：

10.1016/j.cemconres.2016.02.010

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Generally, polycarboxylate superplasticizers (PCEs) are synthesized via aqueous free radical copolymerization. The conditions during copolymerization such as relative reactivity and feeding mode and ratio of monomers can cause different monomer sequences in the final product. In this study, the sequence of monomers in PCE polymers synthesized from acrylic acid and isoprenyloxy polyethylene glycol (IPEG) macromonomer was characterized by C-13 nuclear magnetic resonance (NMR) spectroscopy. Three different triads of monomer sequences (EAE, AAE and AAA; E = ether, A = add monomer) were detected. It was found that IPEG PCEs predominantly contain the structural motifs of AAE and EAE, and less of AAA. Higher additions of acrylic acid do not incorporate into the structure of PCE, but convert to HMW polyacrylate as by-product instead. A PCE with optimal dispersing effectiveness was achieved at high contents of IPEG macromonomer, a molecular weight (M-w) around 40,000 Da and narrow molecular weight distribution. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：20 / 29

页数：10

共 21 条

[1]

[Anonymous], 2007, 10153200705 DIN EN

[2] Microstructural characterisation and behaviour in different salt solutions of sodium polymethacrylate-g-PEO comb copolymers [J].

Borget, P ;

Galmiche, L ;

Le Meins, JF ;

Lafuma, F .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2005, 260 (1-3) :173-182

[3]

Brandrup J.I., 2005, POLYM HDB, V4

[4]

Carraher Jr. C. E., 2007, COPOLYMERIZATION POL, P207

[5] DETERMINATION OF THE TACTICITY AND ANALYSIS OF THE PH TITRATION OF POLY(ACRYLIC ACID) BY H-1 AND C-13 NMR [J].

CHANG, C ;

MUCCIO, DD ;

STPIERRE, T .

MACROMOLECULES, 1985, 18 (11) :2154-2157

[6] Synthesis and stereochemistry of isomeric methacrylic polymers derived from 4- and 5-aminosalicylic acids [J].

Elvira, C ;

SanRoman, J .

POLYMER, 1997, 38 (18) :4743-4750

[7] A new class of organosilane-modified polycarboxylate superplasticizers with low sulfate sensitivity [J].

Fan, Wei ;

Stoffelbach, Francois ;

Rieger, Jutta ;

Regnaud, Laure ;

Vichot, Angelique ;

Bresson, Bruno ;

Lequeux, Nicolas .

CEMENT AND CONCRETE RESEARCH, 2012, 42 (01) :166-172

[8] SEQUENCE DISTRIBUTION OF CARBOXYL GROUPS IN HYDROLYZED POLYACRYLAMIDE [J].

HALVERSON, F ;

LANCASTER, JE ;

OCONNOR, MN .

MACROMOLECULES, 1985, 18 (06) :1139-1144

[9]

Hirata T., 1981, Japanese Patent, Patent No. [JP 84 (1981) 2022 (S59-018338), 1981842022]

[10] Analysis of sequence distribution in methyl methacrylate-methyl acrylate copolymers by 13C NMR spectroscopy [J].

Kim, Y ;

Harwood, HJ .

POLYMER, 2002, 43 (11) :3229-3237

← 1 2 3 →