Particle size and morphology of poly[styrene‐<i>co</i>‐(butyl acrylate)]/nano‐silica composite latex

Li, Hua; You, Bo; Gu, Guangxin; Wu, Limin; Chen, Guodong

doi:10.1002/pi.1677

Cited by 15 publications

(13 citation statements)

References 43 publications

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“…Freris et al (12) prepared nano-silica by Stöber method and applied it in the emulsion polymerization to obtain polymer encapsulation of nano-silica particles. However, most literature reported that nanosilica/polyacrylate composite emulsions were synthesized with the available nano-silica or the nano-silica prepared by sol-gel method in ethanol as dispersing media (13,14). These kinds of nano-silica should be redispersed in acrylate before polymerization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nano-silica/Polyacrylate Composite Emulsions by Sol-gel Method andin-situEmulsion Polymerization

Zeng

et al. 2010

Journal of Macromolecular Science, Part A

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Organic nano-silica was firstly synthesized by sol-gel method with methyl methacrylate (MMA) and butyl acrylate (BA) in the micelles as dispersing media, tetraethoxysilicate (TEOS) as precursor, hydrochloric acid as catalyst and methacryloylpropyl trimethoxysilane (A174) as modifier. Subsequently, the nano-silica/polyacrylate composite emulsions were directly prepared by in-situ emulsion polymerization under the action of the initiator. The structure and properties were characterized by Fourier transform infrared spectroscopy (FTIR), dynamic light-scattering (DSL), thermogracvimetry (TG) and transmission electron microscopy (TEM). The results showed that A174-modified nano-silica was successfully synthesized in the acrylate-based emulsions by the sol-gel method. The nano-silica was encapsulated by polyacrylate, and the composite latex particles exhibited an apparent core-shell structure. The A174 could improve the lipophilicity of nano-silica and increase the grafting efficiency of polyacrylate on nano-silica particles. The nano-silica/polyacrylate composite latex film had better thermal stability, and the composite latex particles had greater average size and broader size distribution in contrast to those of pure polyacrylate emulsions.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nano-silica/Polyacrylate Composite Emulsions by Sol-gel Method andin-situEmulsion Polymerization

Zeng

et al. 2010

Journal of Macromolecular Science, Part A

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“…However, in the morphological researches of small size silica/polymer composite latex particles prepared via chemical approaches, few composite latex particles with typical core-shell can be found, in which a thin polymer layer should be uniformly grafted or coated on the silica particle surface [12][13][14][15]. Instead, the 'guava-like' [12,13,[16][17][18] and 'raspberry-like' [19][20][21] composite structures are commonly found. This is especially true when the size of silica particles is less than 20 nm [22,23] because a large number of small silica particles would 'accumulate' in the bulk or at the surface of composite latex particles even though silica content is less than 5%.…”

Section: Introductionmentioning

confidence: 99%

Dispersion of “guava-like” silica/polyacrylate nanocomposite particles in polyacrylate matrix

Yang

et al. 2008

Front. Chem. Eng. China

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A series of ''guava-like'' silica/polyacrylate nanocomposite particles with close silica content and different grafting degrees were prepared via mini-emulsion polymerization using 3-(trimethoxysilyl)propyl methacrylate (TSPM) modified silica/acrylate dispersion. The silica/polyacrylate composite particles were melt-mixed with unfilled polyacrylate (PA) resin to prepare corresponding silica/polyacrylate molded composites and the dispersion mechanism of these silica particles from the ''guava-like'' composite particles into polyacrylate matrix was studied. It was calculated that about 110 silica particles were accumulated in the bulk of every silica/polyacrylate composite latex particle. Both the solubility tests of silica/polyacrylate composite latex particles in tetrahydrofuran (THF) and the section transmission electron microscope (TEM) micrographs of silica/polyacrylate molded composites indicated that the grafting degree of silica particles played a crucial role in the dispersion of silica/polyacrylate composite particles into the polyacrylate matrix. When the grafting degree of polyacrylate onto silica was in a moderate range (ca. 20%-70%), almost all of silica particles in these ''guava-like'' composite particles were dispersed into the polyacrylate matrix in a primaryparticle-level. However, at a lower grafting degree, massive silica aggregations were found in molded composites because of the lack of steric protection. At a greater grafting degree (i.e., 200%), a cross-linked network was formed in the silica/polyacrylate composite particles, which prevented the dispersion of composite particles in THF and polyacrylate matrix as primary particles.

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“…A number of surface modification methods have been developed to increase the hydrophobicity of IPs . One of the most convenient ways is to cover IPs with a shell of polymer through seeded polymerization, in which the polymer phase and IPs are often linked with coupling agents, for example, silanes with polymerizable double bonds . Fundamental studies on seeded polymerization have been essential to understand the mechanism of controlling the overall morphology of the resultant composite particles.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Sheet‐like Polymer‐Encapsulated Composite Particles by Seeded Polymerization from Sub‐micrometer Sheets

Huang

Yao

et al. 2015

Chemistry An Asian Journal

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Seeded polymerization has been widely used to fabricate polymer-encapsulated inorganic particles (IPs). The most frequently used seeds are spherical, whereas nonspherical particles are not well documented. Recently, sheet-like IPs have attracted much attention in the context of polymer composites. This article is therefore dedicated to understanding seeded polymerization from submicron sheets and focuses on the control of the overall morphology of the composite particles obtained. However, it was found that the composite particles only maintained the sheet-like morphology of the seeds at a low polymer content, whereas they became hamburger-like at a high polymer content owing to minimization of the interfacial energy. Interestingly, when cross-linked, the sheet-like morphology could be well preserved, even at a rather high polymer content. With the encapsulating polymer layer, the obtained sheet-like composite particles showed improved compatibility with the polymer matrix and could be well dispersed in polymer matrix when simply blended.

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Particle size and morphology of poly[styrene‐co‐(butyl acrylate)]/nano‐silica composite latex

Cited by 15 publications

References 43 publications

Synthesis and Characterization of Nano-silica/Polyacrylate Composite Emulsions by Sol-gel Method andin-situEmulsion Polymerization

Synthesis and Characterization of Nano-silica/Polyacrylate Composite Emulsions by Sol-gel Method andin-situEmulsion Polymerization

Dispersion of “guava-like” silica/polyacrylate nanocomposite particles in polyacrylate matrix

Preparation of Sheet‐like Polymer‐Encapsulated Composite Particles by Seeded Polymerization from Sub‐micrometer Sheets

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