Characteristic changes of pH during the alkalization of latex dispersions of the ethyl acrylate — methacrylic acid copolymers

Quadrat, O.; Mrkvičková, L.; Jasná, E.; Šňupárek, Jaromı́r

doi:10.1007/bf01469370

Cited by 3 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous papers, it was reported [17] that changes in particle structure of ethyl acrylate-methacrylic acid copolymers during the alkali treatment are sensitively reflected in the change in pH of the dispersion. Also in the case of crosslinked particles, the method showed characteristic results.…”

Section: Changes In Phmentioning

confidence: 99%

“…1) without crosslinking agent, an inrease in pH diminishes at +0.2 and pH+7 and reaches a flat maximum at +0.5 pH. It was assumed [17] that at that time alkali begins to penetrate the swelling particles, which start to disintegrate into smaller subparticles. The alkali required for neutralization of newly uncovered carboxylic groups is greater than the alkali addition and pH decreases to a shallow minimum.…”

Section: Changes In Phmentioning

confidence: 99%

See 1 more Smart Citation

Structure and flow behavior of crosslinked ethyl acrylate-methacrylic acid copolymer dispersion particles

Quadrat¹,

Mrkvic˘ková²,

Walterová³

et al. 1998

Colloid & Polymer Science

Self Cite

View full text Add to dashboard Cite

Changes in viscosity, pH and static light scattering behavior on alkali addition of model dispersions of statistical copolymers of ethyl acrylate with 15 and 50 wt% of methacrylic acid prepared by semicontinuous emuslion copolymerization and crosslinked with various amount of N,Nmethylenebisacrylamide were investigated. It was found that about 1% of crosslinking agent was sufficient to prevent unpredictable disintegration of dispersion particles and gauranteed reproducible flow behavior of alkalinized dispersions. The viscosity of alkalinized dispersions of crosslinked particles at low concentration is controlled by the effective hydrodynamic volume of swelled particles which decreases with the crosslinking degree of copolymer. On the other hand, at higher particle concentration close to critical concentration at which the space is filled up by swelled particles the influence of particle interaction prevails and due to lower deformability of crosslinked particles viscosity increases with a crosslinking degree. In comparison with similar dispersions prepared without a crosslinking agent these results indicated much uniform structure of dispersion particles and suppression of influence of random crosslinking due to chain transfer reactions. The study shows that dispersions of crosslinked copolymers of this type could be considered as thickners of latex binders with stable and reproducible thickening properties.

show abstract

Section: Changes In Phmentioning

confidence: 99%

Section: Changes In Phmentioning

confidence: 99%