Functionalized mesoporous silica/polyimide nanocomposite thin films with improved mechanical properties and low dielectric constant

Min, Chun-Kuo; Wu, Tai–Bor; Yang, Wei-Ta; Chen, Chi-Lun

doi:10.1016/j.compscitech.2007.09.021

Cited by 81 publications

(36 citation statements)

References 23 publications

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“…Min decreased as the mesoporous silica content increases [13]. A similar case is also found in Lee's research, in which the tensile strength of PI/mesoporous silica composites monotonically declined as mesoporous silica content increases, while the tensile modulus varied in a rather irregular way [10].…”

Section: Introductionsupporting

confidence: 58%

“…Mesoporosity and interfacial bonding between the mesopore surface and PI molecules dominate the enhancing efficiency of mesoporous silica on properties of PI. In Min's study, the one SBA-15-1 mesoporous silica with larger pores is more efficient in enhancing the modulus of PI than that of SBA-15-2 [13]. Dissimilarly, inner surface treatment via coupling agent or chemical grafting aiming to promote the interfacial bonding does not always produce positive impact on the mechanical or thermal properties of PI matrix.…”

Section: Introductionmentioning

confidence: 99%

“…Dissimilarly, inner surface treatment via coupling agent or chemical grafting aiming to promote the interfacial bonding does not always produce positive impact on the mechanical or thermal properties of PI matrix. The surface treatment of SBA-15 using ATS results in decreased tensile strength of PI [13], while on the contrary, tensile strength of PI reinforced with aminopropyl functionalized mesoporous silica is greatly enhanced [12]. The key of interfacial bonding affecting properties of PI matrix relies on whether the introduced chemical group on the mesopore surface could be well bonded with PI molecules or not.…”

Section: Introductionmentioning

confidence: 99%

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Polyimide/mesoporous silica nanocomposites: Characterization of mechanical and thermal properties and tribochemistry in dry sliding condition

Zhao

et al. 2016

Materials & Design

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Mesoporous silica (MPS) with tunable mesopore channels can be used to reinforce polymers and has great potential in tribological applications, which is rarely investigated by research community. In this study, comprehensive properties of polyimide (PI)/MPS composites were investigated. Specially, the tribochemistry of PI/MPS composites in dry sliding against bearing steel was explicitly studied by the combined use of X-ray photoelectron spectroscopy (XPS) and Raman analysis. The results demonstrated a slightly decreased tensile strength but increased modulus, microhardness and thermal stability of the PI/MPS composites. The incorporation of 1.5 wt.% MPS increased the anti-wear resistance of PI by more than 14-fold. This was highly associated with the formation of high-quality transfer film on the bearing steel counterpart surface. Relevant tribochemistry was thoroughly revealed by XPS analysis on the transfer film and Raman analysis on the worn surfaces. This study confirmed the high efficiency of using MPS to reinforce PI polymer for tribological applications and elaborated tribochemistry to further better understand tribochemical reactions in polymer-metal rubbing systems.

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Section: Introductionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polyimide/mesoporous silica nanocomposites: Characterization of mechanical and thermal properties and tribochemistry in dry sliding condition

Zhao

et al. 2016

Materials & Design

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“…From a mathematical point of view, the admissible range for the interface dielectric constants could be calculated from Equation (13) by imposing overall response to be positive. The negative dielectric constant shall be compared to the negative magnetic permeability in diamagnetic materials, for instance.…”

Section: Dielectric Constant Of Batio 3 Particle Compositesmentioning

confidence: 99%

“…With regard to nanoporous materials, studies have shown that the dielectric constant is overpredicted by the classical micromechanics approaches [12]. A possible explanation for such behaviour could be the simplified approximations of the local electric field at the void surface [13]. Lombardo [14] studied the electric properties of composites where spherical inclusions are embedded by an interphase.…”

Section: Introductionmentioning

confidence: 99%

Interface properties influence the effective dielectric constant of composites

Chatzigeorgiou

Javili

Steinmann

2015

Philosophical Magazine

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Erlangen-Nuremberg, Egerlandstr. 5, 91058 Erlangen, Germany In this work we propose a micromechanics model, based on the composite spheres assemblage method, for studying the electrostatic behaviour of particle and porous composites when the interface between the particle (or the pore) and the matrix has its own independent behaviour. Examples from experimental results in porous media and particle composites are utilized to demonstrate the model's capabilities. The current model shows a better agreement with experiments compared with other available studies. Furthermore, it is shown that the interface dielectric constant is independent of the experiments which prove its nature as a material parameter.

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POSS Core star‐shape molecular hybrid materials: Effect of the chain length and POSS content on dielectric properties

Zhang

Guang

et al. 2012

J of Applied Polymer Sci

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A series of inorganic-organic molecular hybrids, poly(styrene-co-octavinyl-polyhedral oligomeric silsesquioxane)s (PS-POSSs), were synthesized, and their structures and properties were characterized by FTIR, 1 H-NMR, 29 Si-NMR, XRD, optical microscopy (OM), and atomic force microscopy (AFM). The chemical incorporation of POSS into polymer matrixes achieves uniform dispersion and makes the resultant hybrids display good film formability. The relationship between molecular structure of these hybrids and their dielectric constants and formation mechanism of low dielectric constant were investigated. The low dielectric constant of the hybrids mainly originates from the increase of free volume, involving the free volume of intrinsic porosity from POSS and an increase in the free volume owing to steric hindrance of bulky POSS. The latter plays a dominant role to increase the free volume and formation of low dielectric constant. Simultaneously, the polymer arm-length has an important influence on the dielectric constant of the star-type hybrids.

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Functionalized mesoporous silica/polyimide nanocomposite thin films with improved mechanical properties and low dielectric constant

Cited by 81 publications

References 23 publications

Polyimide/mesoporous silica nanocomposites: Characterization of mechanical and thermal properties and tribochemistry in dry sliding condition

Polyimide/mesoporous silica nanocomposites: Characterization of mechanical and thermal properties and tribochemistry in dry sliding condition

Interface properties influence the effective dielectric constant of composites

POSS Core star‐shape molecular hybrid materials: Effect of the chain length and POSS content on dielectric properties

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