Grafting and adsorption of poly(vinyl) alcohol in vinyl acetate emulsion polymerization

Carra, S.; Sliepcevich, Andrea; Canevarolo, Alessandro; Carrà, Sergio

doi:10.1016/j.polymer.2004.11.061

Cited by 26 publications

(23 citation statements)

References 7 publications

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“…The chain transfer of PVAc to polymer, monomer and solvent (methanol) during emulsion polymerization in the absence of the PVOH is also a very important subject. As a result of these significant branching reactions of PVAc, there are considerable research results in literature on this subject [27,30,[73][74][75][76][77][78].…”

Section: Emulsion Polymerization Of Vinyl Acetatementioning

confidence: 99%

Emulsion Polymerization: Effects of Polymerization Variables on the Properties of Vinyl Acetate Based Emulsion Polymers

Yamak¹

2013

Polymer Science

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Section: Emulsion Polymerization Of Vinyl Acetatementioning

confidence: 99%

Emulsion Polymerization: Effects of Polymerization Variables on the Properties of Vinyl Acetate Based Emulsion Polymers

Yamak¹

2013

Polymer Science

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“…The iodometric method was applied to measure the residual amount of PVA in aqueous phase, so that the grafting amount of PVA could be calculated accordingly [1,[15][16][17]. PVA could form a brown complex with boric acid and iodine which demonstrated absorption in the visible spectrum; thereby, the intensity of the color of this complex could be used to determine the concentration of the PVA solution.…”

Section: Characterizationsmentioning

confidence: 99%

“…Different from the low-molecule ionic surfactants, PVA molecules could be grafted onto the surfaces of the copolymer particles with hydrophilic moieties stretching out in the water phase so that the steric repulsion interaction between particles was supplied [1]. This mechanism played a vital role in the smooth ongoing of the polymerization and the stability of the resultant emulsions, as when two particles collided the desorption or lateral movement of PVA molecules in the stress zone could be effectively avoided with segments anchored on particle surface by grafting [2].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the different emulsion polymerization routes between acrylic and vinyl acetate monomers using poly(vinyl alcohol) as the sole stabilizer

Lin

Xia

2012

Colloid Polym Sci

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The emulsion polymerization of acrylic and vinyl acetate monomers using poly(vinyl alcohol) (PVA) as protective colloid has been studied for a long time, whereas rare reports ranged over the lateral comparison of the two systems and the reason for the unstability of the PVA/MMA polymerization system was still indistinct. Here in this paper, a collection of experiments of methyl methacrylate (MMA) and vinyl acetate (VAc) were performed respectively with varied amount of PVA as the sole stabilizer. The grafting extent of the polymerisate was characterized through the fraction and FTIR and it was found that the grafted amount of PVA was even larger in the PVA/MMA copolymers than PVA/VAc copolymers, so the grafted mode of PVA was considered. Based on the kinetics, the slower initiation rate of sulfate radical towards MMA was found to be responsible for the unstability of corresponding colloids accompanied with the relatively quicker hydrogen abstraction of radical to PVA, which resulted in "layer-by-layer" grafting structure inside and the particle surface-grafting density was lowered thereof. This was proved with TEM and static contact angle measurements and a pseudohomopolymer model was employed to describe the relationship of colloidal stability and the PVA density on surfaces.

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“…Fortunately, it was possible to graft some hydrophilic polymers such as poly(vinyl alcohol) (PVA) directly on the NR latex particles 17. PVA was widely used as the polymeric stabilizer to impart good colloidal stability in emulsion,18‐20 miniemulsion,21, 22 as well as dispersion23‐25 polymerizations. In the presence of active‐radicals, e.g., persulfate radicals, the hydrogen of the tertiary CH bonds on PVA main‐chains may be abstracted generating the PVA‐radicals that is readily to react with other active radicals 19, 22.…”

Section: Introductionmentioning

confidence: 99%

Grafting of poly(vinyl alcohol) on natural rubber latex particles

Wongthep

Srituileong

Martwiset

et al. 2012

J of Applied Polymer Sci

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Poly(vinyl alcohol) (PVA) was grafted on natural rubber (NR) latex particles (NR-g-PVA) using potassium persulfate to generate active radicals on both NR particle surface as well as PVA molecules. 1 H-and 13 C-nuclear magnetic resonance spectroscopy suggested a possibly chemical attachment of PVA on the NR. The amount of graft-PVA expressed in term of grafting percentage (%G) increased almost linearly with the amount of PVA adding to the NR latex. Measuring by dynamic light scattering, the particle size of NR-g-PVA particles was larger than the size of unmodified NR, also it increased with the molecular weight and %G of PVA. Transmission electron microscopy images of the NR-g-PVA latex particles revealed that the size of PVA-grafted NR particle was enlarged by a layer of graft-PVA surrounding the NR particle. Given by the graft-PVA layer surrounding NR particles, the NR-g-PVA latex particles possessed better colloidal stability as lowering pH compared with the unmodified NR latex. Comparing with unmodified NR particles, the electrophoretic mobility of NR-g-PVA particles was lower due to the presence of graft-PVA that shifted the shear plane further away from the surface of the particles.

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Grafting and adsorption of poly(vinyl) alcohol in vinyl acetate emulsion polymerization

Cited by 26 publications

References 7 publications

Emulsion Polymerization: Effects of Polymerization Variables on the Properties of Vinyl Acetate Based Emulsion Polymers

Emulsion Polymerization: Effects of Polymerization Variables on the Properties of Vinyl Acetate Based Emulsion Polymers

Comparison of the different emulsion polymerization routes between acrylic and vinyl acetate monomers using poly(vinyl alcohol) as the sole stabilizer

Grafting of poly(vinyl alcohol) on natural rubber latex particles

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