Li, Huiqun published the artcileInfluence of hydrolysis rate of carboxylates on dispersion performance of slow-release polycarboxylate superplasticizer, Recommanded Product: Dimethyl itaconate, the publication is Guisuanyan Xuebao (2020), 48(2), 246-252, database is CAplus.
To study the influence of unsaturated carboxylate on the dispersing and flow releasing ability of slow-release polycarboxylate superplasticizer (PCE), the hydrolysis behaviors of carboxylates in sodium hydroxide solution at pH value of 12.0 was investigated, and the constants of hydrolysis rate were derived via a linear fitting. Mini slump was used to examine the variation of flow of cement pastes containing the synthesized slow releasing PCE over time, and the results were compared and analyzed to coordinate the relationship of hydrolysis behaviors of carboxylates and slow-release effectiveness of PCE. The results indicate that PCE with the substitution of acrylic acid with 33.3% Me acrylate and 25.0% di-Me itaconate showed significant slow-release effect, the initial fluidity of cement paste was 149 mm and 104 mm afterwards increased to 223 mm and 212 mm after 2 h resp. PCE with carboxylate monomer of faster hydrolysis rate exhibited quicker flow releasing property, and PCE with carboxylate monomer containing more ester grouped manifested stronger flow releasing ability, but need longer time. The flow releasing property of PCE not only depended on the hydrolysis rate and ester group amount of monomer, but also related to its reactivity of monomer to match the copolymerization system.
Guisuanyan Xuebao published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C7H10O4, Recommanded Product: Dimethyl itaconate.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics