Core–shell polymers: a review

Ramli, Ros Azlinawati; Laftah, Waham Ashaier; Hashim, Shahrin

doi:10.1039/c3ra41296b

Cited by 154 publications

(122 citation statements)

References 140 publications

(116 reference statements)

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“…These structures are synthesized by means of emulsion polymerization, dispersion polymerization, precipitation polymerization on precursor particles, microemulsion polymerization, and living polymerization techniques such as reversible addition-fragmentation chain transfer and atom transfer radical polymerization [3,6]. The main difference between macro-and micro-gels (which leads to pronounced distinctions in their physical properties [7]) consists in distribution of polymer chains and junctions between them.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium swelling of core–shell composite microgels

Drozdov

2015

Meccanica

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A model is developed in finite elasticity of microgels subjected to swelling. Constitutive equations are derived by means of the free energy imbalance relation for an arbitrary three-dimensional deformation with finite strains. The governing equations are applied to the analysis of equilibrium swelling of a core-shell microgel particle with a rigid core and a soft shell. The stress-strain relations involve six material constants whose effect on polymer density profile and distribution of stresses is analyzed numerically. In accord with observations, the model predicts that volume fraction of the polymer network decreases sharply near the core-shell interface, becomes practically constant in the central part of the shell, and decays to zero near the outer surface of a spherical particle.

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Section: Introductionmentioning

confidence: 99%

Equilibrium swelling of core–shell composite microgels

Drozdov

2015

Meccanica

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“…where We is the Weber number, given by Equation (2), and Vi is the viscosity number, given by Equation (3).…”

Section: Hinze-kolmogorov Theorymentioning

confidence: 99%

“…[1] Cross-linked PDMS microspheres not only possess the useful properties of PDMS, but also have the potential for versatile applications, such as drug delivery, [2] enzyme immobilization, [3] and wastewater treatment. [4] Due to these properties and the attractive potential applications, the preparation of PDMS microsphere has been investigated in several studies.…”

Section: Introductionmentioning

confidence: 99%

Polydimethylsiloxane microspheres with poly(methyl methacrylate) coating: Modelling, preparation, and characterization

Ma¹,

Hansen

Hvilsted³

et al. 2015

Can J Chem Eng

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Abstract:Polydimethylsiloxane (PDMS) microspheres are prepared by mixing homogeneous dispersions of vinyl-functional PDMS and a curing agent using mechanical stirring in a series of aqueous solutions, and curing at 80 ℃ for 2 h. In order to verify the experimental diameter and size distributions of the PDMS microspheres, the Hinze-Kolmogorov theory is applied to predict the mean diameter, and a population balance model as well as the maximum entropy formalism are used to describe the size distribution. Close agreement is found between experimental and theoretical results. Furthermore, vinyl functional PDMS microspheres were coated with poly(methyl methacrylate) (PMMA) by spin coating with different concentrations of PMMA 1 solutions. The quality of the resulting PMMA shell is investigated using rheological measurements at 50 ℃ with a time-sweep procedure. The results strongly suggest that PMMA-coated PDMS microspheres react around 20 times slower than the uncoated ones, and that the PMMA shell significantly hinders the reaction between the PDMS microsphere and cross-linker. Thus the thin PMMA shells are very efficient in protecting the reactive PDMS microspheres, since the PMMA shell forms an impermeable barrier up to 50 ℃.

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“…To overcome these difficulties of conventional crosslinked and homopolymer, core-shell polymer offers an attractive alternative. In the past, core-shell technology was used in semiconductor nanocrystal [12,13] along with some other areas like polymer and catalysis Ramli et al [14] demonstrated the possible composition of core-shell matrix. They concluded that core part may be solid, liquid, or gas whereas shell must be a solid part only.…”

Section: Introductionmentioning

confidence: 99%

Design and synthesis of cauliflower-shaped hydroxyl functionalized core-shell polymer

Mane

Ponrathnam

Chavan

2015

Designed Monomers and Polymers

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Conventional crosslinked polymers and homopolymers both have their own limitations. As a result, core-shell polymer was synthesized to obtain cauliflower-shaped and highly hydroxyl functionalized polymer. For the core, acrylate-based copolymers were synthesized by varying crosslinkers and porogens at different crosslink density. Owing to high surface area (554 m 2 /g), poly(MMA-co-DVB) was used as a core and low-molecular weight (24,600 g/mol) poly(GMA) was used as a shell in core-shell approach. Average particle sizes of the core polymers were in the range of 15-75 μm. In order to evaluate reactivity efficiency of core-shell polymer, hydroxyl content was evaluated with a value of 3.97 mmol/ g. Importantly, hydroxyl content demonstrated the successful increase in reactive sites of the core-shell polymer over conventional crosslinked hydroxyl polymer. Notably, synthesized core-shell polymer has more surface area and pore volume which substantially attributes for better polymer efficiency during application. Scanning electron microscopy images revealed the spherical, uniform, and slightly conglomerated properties of core-shell polymer. Due to higher reactivity, insolubility, and more surface area of hydroxyl functionalized core-shell polymer, its use become inevitably essential.

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Core–shell polymers: a review

Cited by 154 publications

References 140 publications

Equilibrium swelling of core–shell composite microgels

Equilibrium swelling of core–shell composite microgels

Polydimethylsiloxane microspheres with poly(methyl methacrylate) coating: Modelling, preparation, and characterization

Design and synthesis of cauliflower-shaped hydroxyl functionalized core-shell polymer

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