Cubic silsesquioxane?polyimide nanocomposites with improved thermomechanical and dielectric properties

Huang, Junchao; Lim, Poh Chong; Shen, Lu; Pallathadka, Pramoda K.; Zeng, Kaiyang; He, Chaobin

doi:10.1016/j.actamat.2005.02.001

Cited by 59 publications

(55 citation statements)

References 35 publications

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“…In this context, hybridizing POSS derivatives with industrially valuable polymeric components can lead to new chemical feed stock technology for the development of interphased nanohybrid materials. There is already evidence to support the belief that modification of polymeric materials using derivatives of polyhedral oligomeric silsesquioxane (POSS) is expected to upgrade many of their useful properties namely thermal stability [3], oxidation resistance [4], resistance to atomic oxygen in low earth orbit [5,6] glass transition temperature [7], tensile strength [8], fracture toughness [9], abrasion resistance, dimensional stability, dielectric behaviour, optical properties and weather resistance [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a POSS-Maleimide Precursor for Hybrid Nanocomposites

Jothibasu

Premkumar

Alagar

et al. 2007

High Performance Polymers

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Epoxy-POSS based hybrid nanocomposites are prepared by in situ polymerization of a homogeneous blend of the diglycidylether of bisphenol-A (DGEBA) and 4,4'-diaminodiphenylmethane (DDM) in the presence of octa(maleimidophenyl)silsesquioxane (OMPS). The reaction of a maleimido-functionalised POSS cube with the epoxy resin is studied by Fourier transform infrared (FTIR) analysis and the formation of nanocomposites is confirmed by wide-angle X-ray diffraction (WAXD) and scanning electron microscopy (SEM). Dynamic mechanical analysis (DMA) studies indicate that the crosslinking structures of the nanocomposite networks are predominantly formed 2 between the terminal maleimide double bonds and the amino groups of DDM through a Michael addition reaction to form an aspartimide. The values of the glass transition temperatures (T g ) decrease with increasing POSS-maleimide content and this is likely to be due to the inclusion of POSS cages into the system and consequent increase in free volume. The dynamic thermal stability of the cured polymers is increased by increasing the POSS content in the hybrid epoxy matrices as evidenced from thermogravimetric analysis (TGA) data.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a POSS-Maleimide Precursor for Hybrid Nanocomposites

Jothibasu

Premkumar

Alagar

et al. 2007

High Performance Polymers

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“…In general, the addition of an inorganic filler to a polymer can weaken the inherent properties of the polymer because of the lack of favorable interactions between the two phases, which may lead to defects. For concentrations up to 5 wt %, the strength and strain at yield were retained, and this could be attributed to good interfacial adhesion and to the incorporation of nanovoids into the polymer matrix, which increased its ability to dissipate energy 22…”

Section: Resultsmentioning

confidence: 99%

Thermal and mechanical properties of blended polyimide and amine‐functionalized poly(orthosiloxane) composites

Iyer

Coleman

2008

J of Applied Polymer Sci

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Nanocomposite films were prepared through the blending of polyimide (PI) with octaphenyl silsesquioxane (OPS) and an amino-functionalized analogue, octaaminophenyl silsesquioxane (OAPS), with a solution-casting method. Although the PI-OPS composites showed visible phase separation at 5 wt %, the PI-OAPS composites were transparent with visible phase separation occurring only at 50 wt % OAPS. The interfacial interactions and homogeneity of the composites were characterized with scanning electron microscopy (SEM) and dynamic mechanical analysis. SEM analysis showed a uniform fracture surface for OAPS composites at concentrations up to 20 wt %. Interestingly, OAPS-rich particles with sizes of less than 1 lm were formed within the PI matrix for the 50 wt % composite. The PI-OAPS composites showed higher glass-transition temperatures (T g 's) than the pure PI. The PI-OPS composites showed a T g lower than that of the pure PI, and this suggested poor interfacial interactions. The slightly enhanced thermal stability of PI-OAPS composites (up to 20 wt %) was attributed to the inherent thermal stability of OAPS at higher temperatures. There were small increases in the modulus and strength for the composites with respect to the base polymer.

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“…Tensile tests were performed on an Instron testing machine (Model 5560, Instron, Norwood, MA) at a cross‐head speed of 1 mm/min at room temperature. The separation speed was slow because polyimide is a brittle material . Specimens were cut using a cutting die as described in ASTM D‐638‐5.…”

Section: Methodsmentioning

confidence: 99%

Impact of processing method and surface functionality on carbon nanofiber dispersion in polyimide matrix and resulting mechanical properties

Coleman

2013

Polym. Compos.

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Composites were produced with functionalized carbon nanofibers (CNF) and polyimide (PI) matrix using either in situ polymerization or blending processes. The impact of the composite processing method, CNF surface chemistry, and fiber loadings on the dispersion of fibers and mechanical properties of composites were investigated. Specifically, functionalization of oxidized CNF with a diamine and polyimide oligomer that mimicked the structure of the base polyimide led to improved dispersion of CNF in the matrix polymer. Samples produced using precipitation blending from hot solvent and in situ polymerization exhibited improved dispersion and reduced agglomeration of CNF relative to samples made using direct blending. While SEM images showed poorly dispersed pristine CNF in PI in the form of agglomerations and thick deposition layer on the bottom of composite film, there was clearly better dispersion for functionalized CNFs. Composites produced with functionalized CNF exhibited improvements in modulus, glass transition temperature and tensile strength relative to the base polyimide.

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Cubic silsesquioxane?polyimide nanocomposites with improved thermomechanical and dielectric properties

Cited by 59 publications

References 35 publications

Synthesis and Characterization of a POSS-Maleimide Precursor for Hybrid Nanocomposites

Synthesis and Characterization of a POSS-Maleimide Precursor for Hybrid Nanocomposites

Thermal and mechanical properties of blended polyimide and amine‐functionalized poly(orthosiloxane) composites

Impact of processing method and surface functionality on carbon nanofiber dispersion in polyimide matrix and resulting mechanical properties

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