Preparation of polyimide-silica hybrid materials via high pressure-thermal polymerization.

Gaw, Kevin; Suzuki, Hisao; Kakimoto, Masa–aki

doi:10.2494/photopolymer.8.307

Cited by 18 publications

(3 citation statements)

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“…Although the films were transparent, the sizes of the globules were fairly large (200 nm), but they were reduced to 70 nm by room-temperature drying of the precursor hybrid solution. A high-pressure polymerization procedure , used by this group was found to concurrently complete the polymerization reaction of both the inorganic and organic phases. It did not, however, permit full densification of the sol−gel-derived silica, as was originally thought by the authors.…”

Section: Some Attempts At Compatibilizationmentioning

confidence: 99%

Polyimide−Ceramic Hybrid Composites by the Sol−Gel Route

2001

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A number of polyimides have gained considerable importance as high-performance polymers during the last 2 decades primarily because of their excellent thermal stability and toughness. Some applications, however, require property enhancements and the desired improvements can often be obtained through incorporation of ceramic-like particles such as silica. Such hybrid inorganic−organic composites are frequently obtained using the in situ generation of the dispersed inorganic phase by the sol−gel technique. A number of studies have now been carried out on the preparation and characterization of such hybrid polyimide composites, and the purpose of this review is to give a brief account of the strategies used for this purpose and to describe some of the properties of the resulting composites.

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Section: Some Attempts At Compatibilizationmentioning

confidence: 99%

Polyimide−Ceramic Hybrid Composites by the Sol−Gel Route

2001

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“…The key to their effectual utilization to achieve desired properties lies in the proper design of the structures, the effective synthesis of the materials system and homogeneity in the polymer matrix. This homogeneity can be achieved at molecular or nanometer level by sol-gel process [1][2][3][4][5][6][7][8][9][10][11] that is a mild chemical route for the in situ generation of ceramic phases into the organic matrices. Our previous work reflected the extensive use of these ceramic phases as reinforcements such as silica [12][13][14][15][16][17], titania [18], zirconia [19], and alumina [20].…”

Section: Introductionmentioning

confidence: 99%

Properties of polyamide‐zirconia nanocomposites prepared from sol‐gel technique

Sarwar¹,

Zulfiqar²,

Ahmad³

2008

Polymer Composites

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Transparent nanocomposites were prepared by producing zirconia network in glassy polyamide matrix using sol-gel technique. Different amounts of tetrapropyl zirconate (TPZ) were added in polymer solution using anhydrous dimethylformamide as solvent. TPZ was hydrolyzed and condensed in situ in the matrix for the generation of inorganic networks using diethylamine. Thin and transparent films containing different proportions of zirconia were obtained by evaporating the solvent. Mechanical, dynamic mechanical thermal and morphological analyses of these films were carried out. An increase in tensile modulus was observed with the films containing zirconia contents up to 15 wt%, but the elongation at rupture was found to decrease sharply on further addition of zirconia. Toughness of the hybrid materials decreased with increased amount of zirconia. Dynamic mechanical thermal analysis (DMTA) performed on the samples indicates an increase in the glass transition temperature; 1028C with pure polyamide to 1328C with polyamide containing 15 wt% zirconia contents. The storage modulus was also found to increase with increase in zirconia proportion in the matrix. The decrease in the storage modulus of the hybrids with rise in temperature was observed to be much smaller as compared with that of pure polymer. Thermal decomposition temperatures of the hybrids were found in the range of 450-5008C. The weights of the residues left at 7008C were nearly proportional to the zirconia contents in the original hybrids. The morphological studies suggest a uniform dispersion of zirconia domains in the matrix. POLYM. COMPOS., 30:95-100,

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“…This is a mild method to generate inorganic network. In this process, depending on the requirement of the size/network of inorganic particles in the composite, a measured quantity of water and a catalyst is added to start the in-situ hydrolysis/condensation of metal alkoxides [1][2][3][4][5][6][7]. An important example of a polymer metal-oxide composite material prepared using the 'sol-gel' process is the hard contact-lens material reported by Schmidt in 1984 [8].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of PVC-Silica Composites using Different Catalysts Via Sol-Gel Process

Asif

Sarwar²,

Ahmad³

1999

MRS Proc.

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Novel micro-composites from Polyvinyl chloride (PVC) and silica were prepared using solgel technique. Different catalysts were used for the in-situ generation of silica network from tetraethylorthosilicate (TEOS) in the PVC matrix. Thin transparent films containing various proportions of silica in PVC were cast by the solvent elution technique. Mechanical properties of these films were studied. The results showed an increase in the value of Young's modulus and strain at rupture by the addition of small amount of silica in PVC. However, the stress at yields point and stress at rupture decreased with the addition of silica contents. Scanning electron microscopy (SEM-EDAX) studies were also performed on these samples.

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Preparation of polyimide-silica hybrid materials via high pressure-thermal polymerization.

Cited by 18 publications

References 0 publications

Polyimide−Ceramic Hybrid Composites by the Sol−Gel Route

Polyimide−Ceramic Hybrid Composites by the Sol−Gel Route

Properties of polyamide‐zirconia nanocomposites prepared from sol‐gel technique

Preparation and Properties of PVC-Silica Composites using Different Catalysts Via Sol-Gel Process

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