Polypropylene wax (PPw)/silica hybrid by in situ non-aqueous sol–gel process for preparation of PP/silica nanocomposites

2010 ◽  
Vol 56 (3) ◽  
pp. 300-309 ◽  
Author(s):  
Jun Qian ◽  
Huagui Zhang ◽  
Guangchun Cheng ◽  
Zhijuan Huang ◽  
Shuaiying Dang ◽  
...  
Keyword(s):  
Sol Gel ◽  
Silica Nanocomposites ◽  
Sol Gel Process ◽  
Silica Hybrid

Preparation and Characterization of Polyimide-Silica Nanocomposites by Sol-Gel Process

2006 ◽  
Vol 111 ◽  
pp. 111-114 ◽  
Author(s):  
Yao Yi Cheng ◽  
Kun Chang Chuang
Keyword(s):  
Sol Gel ◽  
Amic Acid ◽  
Silica Content ◽  
Nano Particles ◽  
Hybrid Thin Film ◽  
Silica Nanocomposites ◽  
Sol Gel Process ◽  
Tetracarboxylic Dianhydride

Polyimide (PI)-based nanocomposites were prepared by the in-situ generation of organic silica nano-particles through a sol-gel process, combined with spin coating and multi-step curing process. In this study, silica nano-particles were introduced into the PI matrix to promote its thermal properties. Nanometer-scale composites were successfully obtained from poly(amic acid) (PAA) mixture loaded with silica. 3,3’,4,4’- Biphenyl tetracarboxylic dianhydride (BPDA) and p-phenylenediamine (p-PDA) were employed to synthesize the PAA precursor. The hybrid thin film was prepared from aminoalkoxysilane-capped PAA and tetraethoxysilane (TEOS). In this work, we investigated the effect of coupling agent, 3-aminopropyltriethoxysilane (APrTEOS). The TGA results indicate that the thermal stability of the nanocomposites can be enhanced as silica content increases. Without the incorporation of APrTEOS, less improvement can be achieved.

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

2009 ◽  
Vol 2 (1) ◽  
pp. 99-107 ◽  
Author(s):  
S. M. M. Alam
Keyword(s):  
Sol Gel ◽  
Tensile Modulus ◽  
Mechanical Analysis ◽  
Hybrid Films ◽  
Scanning Calorimetry ◽  
Chemical Structures ◽  
Sol Gel Process ◽  
Biphenyltetracarboxylic Dianhydride ◽  
Silica Hybrid

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 (Tg) 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. Keywords: Polyimide; Hybrid; Sol-gel process. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i1.2733                 J. Sci. Res. 2 (1), 99-107 (2010)  

Facile method for synthesis of polyaniline/silica hybrid composites by simultaneous sol–gel process and “in situ” polymerization of aniline

2012 ◽  
Vol 63 (3) ◽  
pp. 373-381 ◽  
Author(s):  
Mayra González ◽  
Bluma G. Soares ◽  
Matheus Magioli ◽  
Jéssica A. Marins ◽  
Jacques Rieumont
Keyword(s):  
In Situ Polymerization ◽  
Hybrid Composites ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Silica Hybrid

Synthesis and Intermolecularly Mediated Assembly of Organic Pigment in Hybrid Coating Films

1998 ◽  
Vol 519 ◽  
Author(s):  
Y. Yan ◽  
Z. Duan ◽  
D.-G. Chen ◽  
S. Ray Chaudhuri
Keyword(s):  
Sol Gel ◽  
Hybrid Coating ◽  
Hypsochromic Shift ◽  
Hybrid Films ◽  
Coating Films ◽  
Organic Pigment ◽  
Inorganic Hybrid ◽  
Matrix Interactions ◽  
Sol Gel Process

AbstractThe insoluble, strongly hydrogen bonded organic pigment of 3,6-bis-(4-chlorphenyl)-l,4- diketopyrrolo [3,4-c] pyrrole was transiently blocked by adding carbamate groups, and consequently incorporated into organic-inorganic hybrid matrices by a sol-gel process. The homo- (pigment-pigment) and hetero-intermolecular (pigment-matrix) interactions were found to control both the assembly and dispersion of pigment molecules in the hybrid coating films. A weaker interaction between matrices and pigment molecules results in aggregation of the carbamate pigment in the methyl-silicate films. A stronger interaction forms a homogenous dispersion and coloration of the phenyl-silicate films. The as-prepared methyl- and phenylsilicate films doped with the organic pigment were distinguished by a morphology change and a blue (hypsochromic) shift in absorption from 550 to 460 nm. Thermal treatment can remove the carbamate groups and in-situ form the organic pigment in the hybrid films.

scholarly journals Preparation of Polyimide-Silica Hybrid Films Using Sol-Gel Process.

1992 ◽  
Vol 5 (2) ◽  
pp. 393-396 ◽  
Author(s):  
Atsushi Morikawa ◽  
Hidehiro Yamaguchi ◽  
Yoshitake Iyoku ◽  
Masa-aki Kakimoto ◽  
Yoshio Imai
Keyword(s):  
Sol Gel ◽  
Hybrid Films ◽  
Sol Gel Process ◽  
Silica Hybrid
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