Improvements on the synthesis and properties of fluorinated polyimide–clay nanocomposites by using double-swelling agents

Wang, Hong‐Wen; Dong, Rui‐Xuan; Chu, Hsuan-Chih; Chang, Kung‐Chin; Lee, Wan-Chia

doi:10.1016/j.matchemphys.2005.04.037

Cited by 35 publications

(3 citation statements)

References 37 publications

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“…This increase in T g is likely to be due to two factors: (1) the significant effect of small amounts of dispersed clay layers on the free volume of the PI, and (2) confinement of the intercalated polymer chains within the clay galleries, which prevents segmental chain motions [11]. Similar observations were made during other studies of polymer nanocomposites [35,36]. DSC thermograms of the pure Co-PI and various Co-PI hybrids are displayed in Figure 8.…”

Section: Resultsmentioning

confidence: 53%

Colorless and Transparent Copolyimides and Their Nanocomposites: Thermo-Optical Properties, Morphologies, and Gas Permeabilities

2019

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A series of linear aromatic copolyimides (Co-PIs) were synthesized by reacting 4,4′-biphthalic anhydride (BPA) with various molar contents of 2,2′-bis(trifluoromethyl)benzidine (TFB) and p-xylylenediamine (p-XDA) in N,N′-dimethylacetamide (DMAc). Co-PI films were fabricated by solution casting and thermal imidization with poly(amic acid) (PAA) on glass plates. The thermo-optical properties and gas permeabilities of Co-PI films composed of various molar ratios of p-XDA (0.2–1.0 relative to BPA) were investigated. Thermal properties were observed to deteriorate with increasing p-XDA concentration. However, oxygen-transmission rates (O2TRs) and optical transparencies improved with increasing p-XDA concentration. Co-PI hybrids with a 1:0.2:0.8 molar ratio of BPA:TFB:p-XDA and organically modified hectorite (STN) were prepared by the in situ intercalation method. The morphologies and the thermo-optical and gas permeation properties of the hybrids were examined as functions of STN loading (5–50 wt %). XRD and TEM revealed substantial increases in clay particle agglomeration in the Co-PI hybrid films as the clay loading was increased from 5 to 50 wt %. The coefficient of thermal expansion (CTE) and the O2TR of a Co-PI hybrid film were observed to improve with increasing STN concentration; however, its optical transparency decreased gradually with increasing STN concentration.

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Section: Resultsmentioning

confidence: 53%

Colorless and Transparent Copolyimides and Their Nanocomposites: Thermo-Optical Properties, Morphologies, and Gas Permeabilities

2019

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“…Besides the common fillers mentioned above, other fillers such as epoxy polymers and montmorillonite, etc., have also been reported to be used to synthesize porous PI hybrid membranes. Wang et al [ 86 ] modified montmorillonite with a double-swelling agent ([2-(Dimethylamino)ethyl] triphenylphos-phonium bromide and 4,4′-oxydianiline) and used it as a filler to combine with PAA to construct PI-based composites. When the mass fraction of modified montmorillonite was 3.0 wt.%, the dielectric constant of the porous composite material could be reduced to 2.6 at 1 MHz.…”

Section: Other Pi Composite Materialsmentioning

confidence: 99%

Research Advances of Porous Polyimide—Based Composites with Low Dielectric Constant

et al. 2023

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With the burgeoning of the microelectronics industry, in order to improve the transmission speed between chips in large-scale integrated circuits to meet the demands of high integration, it is necessary for interlayer insulation materials to possess a lower dielectric constant (k). Polyimide (PI) has been widely used as interlayer insulation materials for large-scale integrated circuits, and the exploration on reducing their dielectric constant has attracted extensive attention in recent years. In this work, porous PI-based composites with a low dielectric constant are mainly reviewed. The application of porous SiO2, graphene derivatives, polyoxometalates, polyhedral oligomeric silsesquioxane and hyperbranched polysiloxane in reducing the dielectric constant of PI is emphatically introduced. The key technical problems and challenges in the current research of porous polyimide materials are summarized, and the development prospect of low k polyimide is also expounded.

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“…The last objective was achieved by incorporating hollow silica tubes or mesoporous silica (SBA‐15 and SBA‐16) into polyimide in situ polymerization . Also, porous polymers can be achieved by the introduction of methacrylated‐poly(silsesquioxane) (POSS) into the PI matrix to generate a PI/POSS semi‐interpenetrating network‐like nanocomposite or by the incorporation of montmorillonite (MMT) into PAA to obtain PI nanocomposites . Now, there is a constant demand to obtain porous materials using a simple process that is highly efficient and of low cost …”

Section: Introductionmentioning

confidence: 99%

Porous polyimide films obtained by using lithium chloride as pore-forming agent

Chişcă¹,

Sava²,

Brumă³

2013

Polym. Int.

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Porous polymer films have been obtained from polyimide based on benzophenonetetracarboxylic dianhydride and 4,4'-diamino-3,3'-dimethyl-diphenylmethane by incorporating lithium chloride (LiCl) in the poly(amidic acid) precursor and subsequently leaching out the maximum possible LiCl by water Soxhlet extraction for 6 h. The resulting porous polyimide films were characterized with regard to their pore size, thermal stability and dielectric properties. The morphology of the porous polyimide films showed a uniform distribution and various pore sizes depending on the initial quantity of added pore-forming agent.

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Improvements on the synthesis and properties of fluorinated polyimide–clay nanocomposites by using double-swelling agents

Cited by 35 publications

References 37 publications

Colorless and Transparent Copolyimides and Their Nanocomposites: Thermo-Optical Properties, Morphologies, and Gas Permeabilities

Colorless and Transparent Copolyimides and Their Nanocomposites: Thermo-Optical Properties, Morphologies, and Gas Permeabilities

Research Advances of Porous Polyimide—Based Composites with Low Dielectric Constant

Porous polyimide films obtained by using lithium chloride as pore-forming agent

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