Shell-Layer Stability in Core−Shell Particles Prepared with Different Initiators

Jönsson, Jan-Åke; Karlsson, Ola; Hassander, Helén; Törnell, Bertil

doi:10.1021/ma992046m

Cited by 50 publications

(35 citation statements)

References 6 publications

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“…Extensive studies have been done to fabricate core/shell and hollow capsules by using various techniques such as micellar formation of block copolymers, 1,2 seed emulsion polymerization, 3,4 and layer-by-layer deposition of polyelectrolytes. 5,6 On the other hand, the dynamics of nano-sized polymers have been revealed to be quite different from that of a bulk material, which may be due to anomalous dynamics near an interface and/or to the confinement effects.…”

mentioning

confidence: 99%

Core/Shell and Hollow Polymeric Capsules Prepared from Calcium Carbonate Whisker

Sasaki

Kitagawa

Sato

et al. 2005

Polym J

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ABSTRACT:Polymeric capsules of a rod-like shape were prepared by depositing a poly(methyl methacrylate) or polystyrene thin layer onto the surface of calcium carbonate whisker via emulsion polymerization. The obtained core/ shell capsules were also converted to hollow capsules by dissolving the core material in a hydrochloric acid solution. The average thickness of the outer shell (polymer layer) ranged from 29 to 72 nm. The glass transition temperatures T g 's of the outer shell were almost identical to those of the bulk both for the core/shell and hollow capsules in contrast to the results for ultrathin polymer films, which have been reported to show significantly different T g from the bulk value.

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mentioning

confidence: 99%

Core/Shell and Hollow Polymeric Capsules Prepared from Calcium Carbonate Whisker

Sasaki

Kitagawa

Sato

et al. 2005

Polym J

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“…Bulk polymerized methacrylates are widely used as materials in dentistry [34], but when polymerized in solution, they can be used as varnishes [35], and suspension polymerization results in acrylic beads [36]. Emulsion polymerization has been an important and widely used process for the manufacture of polymer products, e.g., paints, adhesives, coatings, and binders [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54]. One of the advantages of this process is the possibility of obtaining polymers of high molecular weight at a reasonable rate of reaction.…”

Section: Polymerization Techniquesmentioning

confidence: 99%

Environmentally‐Friendly Acrylates‐Based Polymer Latices

Shukla¹,

Rai

2014

Advanced Materials for Agriculture, Food, and Environmental Safety

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Acrylic copolymers have achieved prime importance in various avenues of industrial application such as adhesive in packaging and construction, binder and stabilizer in textiles, base coat in leather, topcoat in fl oor polish, pigment binder in paper industries, etc. Acrylic resins are generally known to have superior exterior durability and weather resistance compared to other organic binders/fi lm-formers commonly used in surface coatings. Th e emulsion polymerization of acrylic monomers provides a good combination of performance properties required in fi lm formation. Th ese properties depend on the copolymer composition, particle size, molecular weight, glass transition temperature (Tg), morphology of the latex particles, etc.In this chapter, the reaction components and polymerization process conditions that aff ect the inherent characteristics of the polymers are presented. Th ere is a discussion of the incorporation of comonomer, which would lead to an improvement in the fl exibility of fi lms produced along with adhesion, gloss, hardness, solvent resistance, water resistance, etc. Also, there is a recently developed successful approach for achieving balanced properties which involves the copolymerization of fi lm-forming monomers like acrylate and methacrylates with crosslinkable monomers.

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“…Previous results suggested that the final particle morphology was determined by the kinetic and thermodynamic competition and constraint, 9,10 and besides the desirable core-shell structure, various alternative morphologies such as raspberry-like, sandwich-like, and even invert core-shell structure might be generated according to different synthetic conditions. [11][12][13][14][15] Thereupon, it is not easy to achieve well-defined core-shell latex due to the interpenetration and diffusion of the core and the shell polymer chains, particularly when the polar difference between the core and the shell is big. In general, two strategies are beneficial to achieve desirable core-shell morphology: one is to vary the relative hydrophobicities of the core and shell, and the other is to prohibit the interpenetration of the core and the shell during the particle growth process.…”

Section: Introductionmentioning

confidence: 99%

Polar Gradient Latex Particles with Hydrophilic Core and Hydrophobic Shell Prepared via Multistep Emulsion Polymerization

Deng

Zhang

et al. 2011

Chin. J. Chem.

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Monodisperse polar gradient particles were synthesized via a three-step emulsion polymerization using poly(butyl acrylate-methyl methacrylate-methacrylic acid-ethylene glycol dimethacrylate) (P(BA-MMA-MAA-EGDMA)) as core, poly(methyl methacrylate-methacrylic acid-styrene) (P(St-MMA-MAA)) as interlayer and polystyrene (PSt) as shell. The particle growth and encapsulation in each emulsion polymerization step were followed by transmission electron microscopy (TEM), dynamic light scattering (DLS) and conductometric titration. Results indicated that the feeding mode and the interlayer were essential to prepare the polar gradient latex particles with hydrophilic core and hydrophobic shell. The morphologies of the two-layer core/interlayer and three-layer core/interlayer/shell particles were observed in TEM micrographs, and the sequential encapsulations of the carboxyl-containing core and the core/interlayer particles were confirmed by an increase in the particle size as well as an increase in the buried carboxyl percentage.

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Shell-Layer Stability in Core−Shell Particles Prepared with Different Initiators

Cited by 50 publications

References 6 publications

Core/Shell and Hollow Polymeric Capsules Prepared from Calcium Carbonate Whisker

Core/Shell and Hollow Polymeric Capsules Prepared from Calcium Carbonate Whisker

Environmentally‐Friendly Acrylates‐Based Polymer Latices

Polar Gradient Latex Particles with Hydrophilic Core and Hydrophobic Shell Prepared via Multistep Emulsion Polymerization

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