Preparation and Properties of Polyimide-Silica-Polydimethylsiloxane Hybrids

Alam, Shaikh Md. Mominul; Kawauchi, Takahiro; Takeichi, Tsutomu

doi:10.2494/photopolymer.20.159

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…Addition of polysiloxanes having phenyl group such as polymethylphenylsiloxane and polydiphenylsiloxane was effective to improve the compatibility of polysiloxanes [13]. Addition of various inorganics such as silica, PDMS, and polysilsesquioxane prepared by sol-gel reaction into PI(BPDA/ODA) was also effective to enhance the properties of PI [14]. In this study, we applied the methodology to prepare PI/silica/PDMS hybrid by forming inorganics consisting of silica and PDMS using PI(PMDA/ODA) and PI(BPDA/PDA) (Fig.…”

Section: Introductionmentioning

confidence: 96%

Preparation and Properties of Polyimide Hybrids with Silica and Polydimethylsiloxane

Takeichi

Takahashi

et al. 2014

J. Photopol. Sci. Technol.

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Polyimide (PI) was successfully hybridized with silica and PDMS by synchronizing two reactions; imidization of poly(amide acid) (PAA) and sol-gel reaction of tetraethoxysilane (TEOS) and diethoxydimethylsilane (DEDMS). TEOS and DEDMS were used as precursors for the formation of silica and polydimethylsiloxane (PDMS), respectively. The progress of sol-gel reaction was confirmed by IR. It was revealed from the study of scanning electron microscopy that silica has better compatibility than PDMS. The effect of the silica and PDMS on the mechanical and thermal properties of the hybrids was studied. Hybrid containing 3-5 wt% of silica and 3-5 wt% of PDMS gave the highest tensile properties. Dynamic viscoelastic analyses and thermogravimetric analyses revealed that thermal properties were improved by the hybridization.

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Section: Introductionmentioning

confidence: 96%

Preparation and Properties of Polyimide Hybrids with Silica and Polydimethylsiloxane

Takeichi

Takahashi

et al. 2014

J. Photopol. Sci. Technol.

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“…First, PAA, diethoxysilane, and water were dissolved in NMP at room temperature, and then the cast films were thermally treated up to 350 ºC for imidization of PAA and the sol-gel reaction of diethoxysilane. In this case, carboxylic group of PAA acts as acid catalyst, and further addition of acid catalyst is not needed [12]. The feed of PAA and diethoxysilane was determined by assuming complete conversion of PAA into PI and diethoxysilanes into polysiloxanes.…”

Section: Preparation Of Pi-polysiloxane Hybridsmentioning

confidence: 99%

Preparation and Properties of Polyimide-Polysiloxane Hybrids Using Sol-Gel Method

Shirai

Takahashi

Kawauchi

et al. 2013

J. Photopol. Sci. Technol.

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Polyimide (PI) was successfully hybridized with polysiloxanes by synchronizing two reactions; imidization of poly(amide acid) (PAA) and sol-gel process of diethoxysilanes. Diethoxydimethylsilane, diethoxymethylphenylsilane, and diethoxydiphenylsilane were used as precursors for the formation of polydimethylsiloxane (PDMS), polymethylphenylsiloxane (PMPS), and polydiphenylsiloxane (PDPS), respectively. The progress of sol-gel reaction was confirmed by IR. The compatibility of polysiloxanes with polyimide was studied by scanning electron microscopy, which revealed better compatibility of phenyl group containing polysiloxanes. The effect of the pendant group of polysiloxane on the mechanical and thermal properties of PI-polysiloxane hybrids was studied. Tensile strength of PI were increased by the addition of small amount of polysiloxanes. Hybrid containing 3 wt% of PDMS gave the highest tensile properties. Dynamic viscoelastic analysis of the PI-polysiloxane hybrid revealed two glass transition temperatures corresponding to polysiloxane and PI components. Thermogravimetric analysis revealed higher thermal stability by the hybridization.

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“…In this situation, PI-silica hybrid prepared by in-situ sol-gel process will be an excellent approach to improve thermal stability, tensile modulus and CTE of PI due to high thermal stability and rigidity of silica. Till now, much research has carried out to develop the properties of PI [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Among the PIs, rigid PI from BPDA and PDA (Scheme 1) is a unique type of PI because of its high modulus, increased tensile modulus by cold drawing, remarkable spontaneous in-plane orientation, low water sorption, low stress relaxation co-efficient and minimum coefficient of thermal expansion [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of Nano-hybrids Synthesized from Polyimide and Silica

Alam

2009

J. Sci. Res.

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Polyimide (PI)-inorganic like silica hybrid films were successfully prepared to combine the good performances of silica like tensile modulus, thermal stability etc. into organic PI. Polyamic acid (PAA), precursor of PI, was prepared from 3, 3′, 4, 4′-biphenyltetracarboxylic dianhydride (BPDA), p-phenylediamine (PDA) and in-situ formed silica was formed into PAA from tetraethoxysilane (TEOS) through in-situ sol-gel process. The films were transparent and became translucent in presence of up to 10% inorganic contents. The chemical structures were characterized by Fourier transform infrared spectroscopy (FTIR). The morphology of the films was investigated by scanning electronic microscopy (SEM). Differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), stress-strain tests and dynamic mechanical analysis (DMA) were used to evaluate the performances of the films. The results indicated that the glass-transition temperatures (T g ) and decomposition temperatures of the PI-silica hybrid films were higher than those of pristine PI. Tensile modulus, tensile strength of PI increased prominently in presence of small amount (1%) of silica in PI-silica hybrid.

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Preparation and Properties of Polyimide-Silica-Polydimethylsiloxane Hybrids

Cited by 3 publications

References 11 publications

Preparation and Properties of Polyimide Hybrids with Silica and Polydimethylsiloxane

Preparation and Properties of Polyimide Hybrids with Silica and Polydimethylsiloxane

Preparation and Properties of Polyimide-Polysiloxane Hybrids Using Sol-Gel Method

Preparation and Performance of Nano-hybrids Synthesized from Polyimide and Silica

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