Simultaneously improved toughness and dielectric properties of epoxy/core‐shell particle blends

Wan, Wei; Yu, Demei; Jian, He; Xie, Yunchuan; Huang, Long‐Biao; Guo, Xuhong

doi:10.1002/app.26102

Cited by 28 publications

(18 citation statements)

References 27 publications

(24 reference statements)

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“…A detailed background on the theory and technique of PALS can be found elsewhere [28][29][30]. Briefly speaking, the lifetimes and intensities of positrons, which are generated from a 22 Na source, are measured and used to estimate the local free volumes inside polymers. Once inside the polymers, the positron forms one of the two possible types of positroniums, i.e., an ortho-positronium or a para-positronium, can pair with an electron abstracted from the polymer environment.…”

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confidence: 99%

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Dielectric and mechanical properties of diglycidyl ether of bisphenol a modified by a new fluoro-terminated hyperbranched poly(phenylene oxide)

et al. 2013

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Diglycidyl ether of bisphenol A (DGEBA)/fluoro-terminated hyperbranched poly(phenylene oxide) (FHPPO) composites with improved mechanical and dielectric performances were prepared by blending a FHPPO with DGEBA. The low-polarity building blocks, abundant fluorinated terminal groups, and the inherent free volume brought by FHPPO efficiently lowered the dielectric constant and the dissipation factor. The free volumes of the cured DGEBA/FHPPO composites, which were quantified by positron annihilation lifetime spectroscopy, increased with the FHPPO loading. The moisture absorption of composites also decreased after the introduction of FHPPO due to the hydrophobicity of fluorinated substituents. Dynamic mechanical analysis tests and scanning electron morphology revealed that FHPPO phase separated from the composites during the curing process. The average diameter of dispersed FHPPO particles increased proportionally with the FHPPO loading. Composites with dispersed particle size of around 150 nm showed the best comprehensive mechanical performance. In addition, incorporation of FHPPO, which has lots of aromatic structures, into DGEBA also increased the thermal stabilities. POLYM. COMPOS., 34:1051-1060,

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confidence: 99%

“…This can be achieved by introducing hollow microsphere [22] or by solvent evaporation [23]. However, microsized pores and cavities can lead to stress concentration and impair mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and mechanical properties of diglycidyl ether of bisphenol a modified by a new fluoro-terminated hyperbranched poly(phenylene oxide)

et al. 2013

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“…CSR particles were also used for toughening and modifying other brittle plastics, for instance, PVC,PS,PC, Epoxy resin, unsaturated polyester, etc. (12)(13)(14). In order to improve the low temperature toughness of blends, the core of CSR particles can also be generated by silicone rubber elastomers (15,16).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Large Dimension PBA-P(MMA-ITA) Latex Particles with Core-Shell Morphology

Liu

Tian

et al. 2013

Journal of Macromolecular Science, Part A

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In this paper, a novel large dimension poly(n-butyl acrylate)-poly(methyl methacrylate-itaconic acid) (PBA-P(MMA-ITA)) core-shell latex particles (CSR) with diameter of 200 nm∼300 nm were successfully synthesized via pre-emulsion and semi-continuous seeded emulsion polymerization process. The analysis on the surface tension and coagulation rate of polymeric system, size and distribution of latex particles indicated that the composite emulsifier of sodium dodecyl sulfonate/polyoxyethylene nonyl phenyl ether (SDS/OP-10) had the best emulsified effect. The optimal ratio of SDS/OP-10 was 1:1 and its optimum dosage was 1.0% of monomer amount. FTIR analysis results confirmed that ITA participated in the copolymerization reaction and the chemical bond between P(MMA-ITA) copolymer and PBA core existed in the interfacial of core and shell. DSC analysis results showed that the glass transition temperature (T g ) of P(MMA-ITA) copolymer increased with the increase of the ITA dosage and decreased with the increase of the core shell mass ratio. TEM images revealed that CSR particles had core-shell morphology indeed, but the particles' core-shell morphology would be changed at higher ITA dosage and core shell mass ratio. The size of CSR particles was 330 nm, and the diameter of PBA core was 290 nm. ITA content in the shell of CSR particles was analyzed by non-aqueous acid-base titration. ITA content was the highest at 6% of ITA dosage, ITA amount which chemically bonded with PBA core was the highest at 8% of ITA dosage. When the core shell mass ratio was 60/40, ITA content and ITA amount which grafted onto PBA core were both the highest. ITA content of CSR particles achieved above 1.11% in this work, and it is completely possible for using CSR particles toughening and compatibilizing polyamide 6 (PA 6).

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“…With further increase in sliver loading to 71.1 wt%, the permittivity reached 120, which was about 40 times higher than that of pristine PI, and this phenomenon may be explained based on the percolationlike transition. Moreover, the permittivity was found to be almost independent of frequency and can be attributed to the PI dielectric shells functioning as the electrical barriers among the sliver cores to prevent them from direct connection [26,27].…”

Section: Resultsmentioning

confidence: 98%

Preparation and properties of core–shell silver/polyimide nanocomposites

Wang

et al. 2014

Polym. Bull.

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A new series of core-shell structured silver/polyimide (PI) nanocomposites was prepared by in situ polymerization followed by the chemical imidization of poly(amic acid) (PAA, precursor of PI) at a low temperature. The TEM images showed that the silver cores of the nanocomposites were encapsulated with homogeneous shells with thickness of 4 and 8 nm at silver contents of 90 and 60 %, respectively. The shell thickness was controlled by varying the content of PAA. FTIR spectroscopic analysis indicated that the imide ring formation occurred after the chemical imidization. The Ag/PI nanocomposites showed excellent thermal stability and exhibited only 10 % weight loss at 300°C in the air. Moreover, percolation was observed at silver weight fractions close to the critical value, and the maximum dielectric permittivity of the nanocomposites was 120, which is about 40 times higher than that of pristine PI.

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Simultaneously improved toughness and dielectric properties of epoxy/core‐shell particle blends

Cited by 28 publications

References 27 publications

Dielectric and mechanical properties of diglycidyl ether of bisphenol a modified by a new fluoro-terminated hyperbranched poly(phenylene oxide)

Dielectric and mechanical properties of diglycidyl ether of bisphenol a modified by a new fluoro-terminated hyperbranched poly(phenylene oxide)

Synthesis and Characterization of Large Dimension PBA-P(MMA-ITA) Latex Particles with Core-Shell Morphology

Preparation and properties of core–shell silver/polyimide nanocomposites

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