Morphology of polystyrene/polystyrene-block-poly(methyl methacrylate)/poly(methyl methacrylate) composite particles

Okubo, Masayoshi; Saito, Naohiko; Takekoh, Ryu; Kobayashi, Hiroshi

doi:10.1016/j.polymer.2004.11.057

Cited by 73 publications

(102 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, a critical parameter in determining the morphology of the particles is the interfacial interaction between the BCPs and surrounding media, and compared with thin films or the bulk case, the interfacial interactions are greatly magnified due to the high surface area relative to their volume . For example, Okubo et al showed that the outer wetting layer of the onion‐like structure of PS‐ b ‐PMMA BCPs could be controlled to be either PS or PMMA using amphiphilic organic surfactants . More recently, Jeon et al and Klinger et al controlled the morphology of BCP colloidal particles from onion‐like to prolate ellipsoids with axially stacked lamellae by using mixed surfactants that neutralized the surface preference of each block of BCPs to the surrounding media .…”

Section: Np Surfactants For Bcp Emulsion Dropletsmentioning

confidence: 99%

Tailoring block copolymer and polymer blend morphology using nanoparticle surfactants

Yang

Jang

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

View full text Add to dashboard Cite

Combining the functionality of nanoparticles (NPs) with the processability of polymers offers great promise for designing novel materials. In particular, NPs with tailored surface properties can effectively modify the interface between two distinct fluids and/or different polymer matrices which allows them to function as efficient surfactants. The efficiency of NP surfactants is strongly affected by their size and shape, which influences their adsorption energy to the interface, and the entropic contribution to the system. In this review, the assembly of size-and shape-controlled inorganic NPs at the interface of block copolymers (BCPs) and polymer blends has been focused. First, we discuss the design of size-and shapecontrolled NP surfactants and we review the examples of NP surfactant-driven BCPs and polymer blend morphologies. In addition, we review the recent investigations of the morphological transition of BCP emulsion particles induced by NP surfactants. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 228-237

show abstract

Section: Np Surfactants For Bcp Emulsion Dropletsmentioning

confidence: 99%

Tailoring block copolymer and polymer blend morphology using nanoparticle surfactants

Yang

Jang

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

View full text Add to dashboard Cite

show abstract

“…Half-spherical structures are accessible by removing the liquid in acorn structures formed with a polymer and a liquid [40,61]. Onion-like structures are created from block copolymers, for which the phase separation into lamellae causes layered structures that follows the curvature of the particle where they are confined [37,40,62]. The diameter of the particle is in this case also very important.…”

Section: Colloidal Structuresmentioning

confidence: 99%

“…One possibility to control the viscosity inside the droplets of polymeric emulsions is to vary the molecular weight of the polymer or the solubility of the polymer in the chosen solvent. Additionally, both the evaporation temperature and the evaporation rate of the solvent are of high importance for the build-up of a thermodynamically stable morphology [36,37,69]. However, structures that resemble kinetically trapped morphologies can also be thermodynamically stable when specific ratios of block length in the block copolymers are achieved [23] or if the phase separation occurs in the weak segregation limit [40].…”

Section: Colloidal Structuresmentioning

confidence: 99%

“…2) [31]. The use of different polymer mixtures or architectures such as polymer blends [19,[33][34][35], statistical copolymers [32], and block copolymers [23,[36][37][38][39][40] is possible. The latter polymer architecture is especially interesting for introducing an additional spatial segregation in nanoparticles to yield new multicompartment structures, such as nanocapsules or polymer particles with two or more phases, which are discussed in more detail below.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in the Emulsion Solvent Evaporation Technique for the Preparation of Nanoparticles and Nanocapsules

Staff

Landfester

Crespy

2013

Hierarchical Macromolecular Structures: 60 Years After the Staudinger Nobel Prize II

View full text Add to dashboard Cite

The emulsion solvent evaporation technique is a method for preparing nanoparticles and nanocapsules that are particularly adapted for applications requiring materials with high purity and low toxicity, such as for biomedicine or electronics. We discuss here new important advances concerning the elucidation of the mechanism of nanoparticle formation, and the synthesis of nanoparticles with new structures or from new polymers.

show abstract

“…8,9 We succeeded in preparing 'onion-like' multilayered PS/PS-b-PMMA/PMMA composite particles using the solvent evaporation method, in which PS-b-PMMA should exist at the interface between the PS and PMMA phases and decrease the interfacial tension. 10 In this study, to clarify the cleavage mechanism in greater detail, the effect of PS-b-PMMA on the cleavage of Janus PS/PMMA composite particles will be examined.…”

Section: Introductionmentioning

confidence: 99%

Preparation of hemispherical particles by cleavage of micrometer-sized, spherical polystyrene/poly(methyl methacrylate) composite particles with Janus structures: effect of polystyrene-b-poly(methyl methacrylate)

Yamashita

Okubo

2014

Polym J

Self Cite

View full text Add to dashboard Cite

We recently reported that two micrometer-sized, hemispherical polymer particles were prepared as a result of the cleavage of spherical Janus polystyrene (PS)/poly(methyl methacrylate) (PMMA) composite particles after treatment with acetone. The original composite particles were prepared by slow evaporation of toluene from homogeneous PS/PMMA/toluene droplets dispersed in an aqueous solution of sodium dodecyl sulfate. This article aims to validate a proposed cleavage mechanism which is based on the induction of internal stress at the interface because of a great difference in the swelling ratio between the PS and PMMA phases. The effect of PS-b-PMMA, which should exist at the interface between both phases and decrease the internal stress, on the cleavage phenomenon was examined. PS/PS-b-PMMA/PMMA composite particles were prepared in the same way as the previous study. At 0.31 wt% or greater of PS-b-PMMA (number-average molecular weight: 10.6 × 10 4 -b-9.9 × 10 4 ), the composite particles did not have a Janus structure but an ex-centered core-shell structure, resulting in no cleavage. At 0.18 wt% or less, they had a Janus structure, and the cleavage phenomenon was observed. The required time to cleave increased with increasing PS-b-PMMA content to below 0.18 wt%. Specifically, the existence of PS-b-PMMA delayed the cleavage of the composite particles into PS and PMMA hemispherical particles. This result supports the proposed cleavage mechanism and provides a tool to easily address the cleavage process for the production of hemispherical particles.

show abstract

Morphology of polystyrene/polystyrene-block-poly(methyl methacrylate)/poly(methyl methacrylate) composite particles

Cited by 73 publications

References 19 publications

Tailoring block copolymer and polymer blend morphology using nanoparticle surfactants

Tailoring block copolymer and polymer blend morphology using nanoparticle surfactants

Recent Advances in the Emulsion Solvent Evaporation Technique for the Preparation of Nanoparticles and Nanocapsules

Preparation of hemispherical particles by cleavage of micrometer-sized, spherical polystyrene/poly(methyl methacrylate) composite particles with Janus structures: effect of polystyrene-b-poly(methyl methacrylate)

Contact Info

Product

Resources

About