Coalescence mechanisms of polymer colloids

Dobler, F. X.; Pith, Tha; Lambla, Morand; Holl, Y.

doi:10.1016/0021-9797(92)90002-4

Cited by 51 publications

(26 citation statements)

References 19 publications

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“…Other studies claimed that the film formation was dependent on thermodynamics and the heat transfer from the surroundings [4] and that interfacial tension forces acted along with capillary forces to cause film coalescence [5]. Yet another study showed that the rate of the particle coalescence decreased with decreased polymer/water interfacial tension but also that the polymer/water interfacial tensions had a negligible contribution to the coalescence as long as water evaporated [6,7]. Recently Routh and Russel [8,9] presented a comprehensive model for film formation by which many of the earlier film formation studies could be explained.…”

Section: Introductionmentioning

confidence: 94%

Drying rate variations of latex dispersions due to salt induced skin formation

Erkselius

Wadsö

Karlsson

2008

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 94%

Drying rate variations of latex dispersions due to salt induced skin formation

Erkselius

Wadsö

Karlsson

2008

Journal of Colloid and Interface Science

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“…Various experimental and theoretical studies have been carried out to understand the effects of surface properties (fixed charges, presence of surfactant, interfacial-tension, etc. ), presence of rigid nanodomains, temperature, etc., on the particle coalescence behavior [5][6][7][8][9][10][11][12]. For such colloidal system, due to nano and submicron scales of the primary particles, it is often difficult to observe directly the coalescence process using microscopic tools.…”

Section: Introductionmentioning

confidence: 99%

Monitoring coalescence behavior of soft colloidal particles in water by small-angle light scattering

Wei

Xia

et al. 2012

Colloid Polym Sci

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The fractal dimension (D f ) of the clusters formed during the aggregation of colloidal systems reflects correctly the coalescence extent among the particles (Gauer et al., Macromolecules 42:9103, 2009). In this work, we propose to use the fast small-angle light scattering (SALS) technique to determine the D f value during the aggregation. It is found that in the diffusion-limited aggregation regime, the D f value can be correctly determined from both the power law regime of the average structure factor of the clusters and the scaling of the zero angle intensity versus the average radius of gyration. The obtained D f value is equal to that estimated from the technique proposed in the above work, based on dynamic light scattering (DLS). In the reactionlimited aggregation (RLCA) regime, due to contamination of small clusters and primary particles, the power law regime of the average structure factor cannot be properly defined for the D f estimation. However, the scaling of the zero angle intensity versus the average radius of gyration is still well defined, thus allowing one to estimate the D f value, i.e., the coalescence extent. Therefore, when the DLS-based technique cannot be applied in the RLCA regime, one can apply the SALS technique to monitor the coalescence extent. Applicability and reliability of the technique have been assessed by applying it to an acrylate copolymer colloid.

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“…The role of the shell is to ensure compatibility with the matrix. Core-shell structured polyacrylics, like poly(butyl acrylate)/poly(methyl methacrylate) (PBA/PMMA) have been generally used to toughen poly(vinyl chloride) (PVC) [13] and polycarbonate [14] . Clearly these properties are much dependent on the relative composition of the core and shell layers as well as on the structure of the core-shell particles, such as the size of the particles, the homogeneity of the shell coverage.…”

Section: Introductionmentioning

confidence: 99%

Preparation of core-shell structured polyacrylic modifiers and effects of the core-shell weight ratio on toughening of poly(butylene terephthalate)

Yang

et al. 2014

Chin J Polym Sci

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Core-shell structured polyacrylic (named CSSP) impact modifiers consisting of a rubbery poly(n-butyl acrylate) core and a rigid poly(methyl methacrylate) shell with a size of about 353 nm were prepared by seed emulsion polymerization. The CSSP modifiers with different core-shell weight ratios (90/10, 85/15, 80/20, 75/25, 70/30, 65/35 and 60/40) were used to modify the toughness of poly(butylene terephthalate) (PBT) by melt blending. It was found that the polymerization had a very high instantaneous conversion (> 95.7%) and overall conversion (99.7%). The morphology of the core-shell structure was confirmed by means of transmission electron microscopy. Scanning electron microscopy was used to observe the morphology of the fractured surfaces. Differential scanning calorimeter was used to study the crystallization behaviors of PBT/CSSP blends. The dynamic mechanical analyses of PBT/CSSP blends showed two merged transition peaks of PBT matrix, with the presence of CSSP core-shell structured modifier, that were responsible for the improvement of PBT toughness. The results indicated that the notch impact strength of PBT/CSSP blends with a core-shell weight ratio of 75/25 was almost 8.64 times greater than that of pure PBT, and the mechanical properties agreed well with the SEM observation.

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Coalescence mechanisms of polymer colloids

Cited by 51 publications

References 19 publications

Drying rate variations of latex dispersions due to salt induced skin formation

Drying rate variations of latex dispersions due to salt induced skin formation

Monitoring coalescence behavior of soft colloidal particles in water by small-angle light scattering

Preparation of core-shell structured polyacrylic modifiers and effects of the core-shell weight ratio on toughening of poly(butylene terephthalate)

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