Applications of sulfonate–carboxylate copolymers in cement

Abstract

Copolymers of methoxy polyethyleneglycol (meth)acrylate (mPEG(M)A) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) were synthesised, characterised with Fourier transform infrared spectroscopy and gel permeation chromatography, and the effects of molecular architecture on the properties of cement-based systems were investigated. Superplasticiser (SP) adsorption was determined with a total organic carbon analyser, while spread and mechanical properties were assessed according to European standards. The rheological behaviour of cement pastes at different copolymer dosages was also studied. Sufficient fluidity and fluidity retention over time are requirements for the mixing, transportation, pumping and moulding of concrete at construction sites. The synthesised SPs with long side chains provided mortars with high fluidity, high dispersing power per adsorption ratio and low mechanical strength compared with the SPs with short side chains. They were also effective at decreasing the shear yield stresses and plastic viscosities (at high dosages) of the cement pastes. Additionally, mortars dosed with mPEG(M)A-co-AMPS had higher fluidity and fluidity-retaining properties compared with mortars prepared with lignosulfonate-type SP.

Influences of design parameters on the properties of self‐compacting concrete produced with structurally different polycarboxylates

“…SP‐A and SP‐B are mPEGMA‐co‐MAA copolymers possessing different side‐chain lengths, SP‐A has shorter side‐chains than SP‐B. Additionally, SP‐A has higher molecular weight (Table ) and in previous studies the influences of bigger SP molecules to well‐dispersion was discussed in detail . Figure also reflects the incontrovertible outcomes of SCC incorporating cross‐linked polymer in terms of mechanical property and workability (M‐12).…”

“…The organic admixture disperses the cement particles by the surface‐activating action between solid and liquid phases so, the requirement of the mixing water can be decreased . The mechanism of action of PCs is based on both by electrostatic repulsion and by steric hindrance effect, the side‐chain role and the charge characteristics of the polymer backbone can change the adsorption and flow behaviors of cement system.…”

The effects of polycarboxylate-based superplasticizers on the rheological behaviours of cement pastes containing silica fume

“…Süperakışkanlaştırıcı sentezinde monomer olarak metakrilik asit-MAA (Aldrich), fumarik asit-FA (Aldrich) ve metoksi polietilenglikol akrilat-mPEGA (Aldrich) kullanılmıştır. [14], [15]. Aşağıda, sentezlenen polimerlerin kimyasal yapıları Şekil 1'de yer almaktadır.…”

Amphiphilic properties of 2-(acrylamido)dodecanesulfonic acid and its water-soluble copolymers with alkoxyoligo(ethylene glycol)methacrylates

“…Для этого может быть использована сополимеризация АОЭГМ и МОЭГМ с акриламидосульфокислотными производными. Наиболее известным из них является 2-акриламидо-2-метилпропансульфокислота, водорастворимые сополимеры которой применяются в качестве флокулянтов [14], стабилизаторов дисперсных систем [15,16], суперпластификаторов для бетонов [17], а также в процессах нефтедобычи [18][19][20]. В последние годы повысился интерес к более амфифильным мономерам такого типа -высшим акриламидоалкансульфокислотам, которые получают взаимодействием высших α-олефинов, акрилонитрила и серной кислоты или олеума [21][22][23][24][25].…”