MORPHOLOGY AND CHARACTERIZATION OF POLYIMIDE/POLYSILSESQUIOXANE HYBRID FILMS WITH MESO/MACRO DOUBLE POROUS STRUCTURE

2004 ◽  
Vol 13 (03n04) ◽  
pp. 541-545
Author(s):  
KYUNG-IL KIM ◽  
JUN-YOUNG LEE ◽  
JOON-HYUN AN ◽  
JUNG-HYUN KIM
Keyword(s):  
Porous Structure ◽  
Organic Molecules ◽  
Hybrid Film ◽  
Sol Gel ◽  
Matrix Material ◽  
Hybrid Films ◽  
Hybrid Thin Film ◽  
Sol Gel Process ◽  
Temperature And Pressure

Supercritical CO 2 ( ScCO 2) can dissolve organic materials easily just by changing temperature and pressure. This property of ScCO 2 can be applied to extract some ScCO 2-philic organic molecules from matrix material. The ScCO 2 was used to generate the meso/macro double porous structure of polyimide/polysilsesquioxane (PI/PSSQ) hybrid film. The morphology of the porous structure was measured by scanning electron microscope (SEM). Here, we demonstrate that the ScCO 2 could penetrate into the hybrid thin film and take away the small molecules, which are the by-product ( CO 2) from the imidization reaction of the PI segment and the solvent remained in the PSSQ segment by sol-gel process.

Synthesis and characterization of hybrid films from hyperbranched polyester using a sol-gel process

2013 ◽  
Vol 131 (3) ◽  
pp. n/a-n/a ◽  
Author(s):  
Amélie Houel ◽  
Jocelyne Galy ◽  
Aurélia Charlot ◽  
Jean-François Gérard
Keyword(s):  
Sol Gel ◽  
Synthesis And Characterization ◽  
Hyperbranched Polyester ◽  
Hybrid Films ◽  
Sol Gel Process

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.

Preparation and characterization of polyimide/Al2O3 hybrid films by sol–gel process

2008 ◽  
Vol 108 (2) ◽  
pp. 705-712 ◽  
Author(s):  
Pengchang Ma ◽  
Wei Nie ◽  
Zhenghua Yang ◽  
Peihong Zhang ◽  
Gang Li ◽  
...  
Keyword(s):  
Sol Gel ◽  
Hybrid Films ◽  
Sol Gel Process

scholarly journals Effect of diisodecyl adipate concentration in hybrid films applied to tinplate

2017 ◽  
Vol 23 (1) ◽  
pp. 83-95
Author(s):  
Sandra Kunst ◽  
Lilian Beltrami ◽  
Marielen Longhy ◽  
Henrique Cardoso ◽  
Tiago Menezes ◽  
...  
Keyword(s):  
Open Circuit Potential ◽  
Hybrid Film ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Open Circuit ◽  
Hybrid Films ◽  
Electrochemical Tests ◽  
Sol Gel Process ◽  
New Formulation ◽  
Alkoxide Precursors

Siloxane hybrid films are fragile and have low mechanical strength due to their vitreous material properties. Hence, a new formulation incorporating a plasticizer agent was developed in order to increase the layer thickness of a uniform and homogeneous hybrid film on tinplate, and to provide flexibility to the polymeric matrix. Tinplate sheets were coated with a hybrid film obtained from a sol-gel process, constituted by t+he addition of the following alkoxide precursors: 3-(trimethoxysilyl) propyl methacrylate and tetraethoxysilane with 0.01 mol L-1 cerium nitrate addition. The influence of the diisodecyl adipate plasticizer con-centration was evaluated. The films were characterized by scanning electron microscopy, profilometry, open circuit potential monitoring, polarization curves and electrochemical impedance spectroscopy. The results showed that all films with diisodecyl adipate had higher electrochemical performance compared to uncoated tinplate. However, the film with the 2% plasticizer concentrations had the best performance in the electrochemical tests, although it had thinner layer.

Atomic Oxygen Effects of Polyimide/Silica Hybrid Films in Low Earth Orbit Environment

2010 ◽  
Vol 177 ◽  
pp. 686-689 ◽  
Author(s):  
Shu Wang Duo ◽  
Mi Mi Song ◽  
Ying Luo ◽  
Ting Zhi Liu ◽  
Wei Min Gao
Keyword(s):  
Atomic Oxygen ◽  
Hybrid Film ◽  
Sol Gel ◽  
Polyimide Film ◽  
Low Earth Orbit ◽  
Earth Orbit ◽  
Hybrid Films ◽  
Oxygen Effects ◽  
Sol Gel Process ◽  
Silica Hybrid

To improve AO resistance of polyimide, a type of polyimide/silica (PI/SiO2) hybrid film was prepared by the sol-gel process. The coupling agent p-aminophenyltrimeth- oxysilane (APTMOS) was chosen to enhance the compatibility between the polyimide (PI) and silica (SiO2). AO resistance of the PI/SiO2 hybrid films were tested in the ground-based simulation AO facility. The erosion yield of the films was 4.7×10-26 cm3/atom, decreased by two orders of magnitude compared with the value of 3.0×10-24 cm3/atom of the polyimide film. Results from FTIR, XPS, AFM on AO treated polyimide/silica hybrid films indicate the formation of a passivating inorganic SiO2 layer. The layer significantly retards the penetration of oxygen atoms, preventing further degradation of the polymer in the bulk. The addition of SiO2 in polyimide does not significantly alter the optical properties of polyimide during AO exposure.

Ordered porous structure hybrid films generated by breath figures for directional water penetration

RSC Advances ◽  
2015 ◽  
Vol 5 (107) ◽  
pp. 88471-88476 ◽  
Author(s):  
Tianqi Guo ◽  
Keyu Han ◽  
Liping Heng ◽  
Moyuan Cao ◽  
Lei Jiang
Keyword(s):  
Porous Structure ◽  
Hybrid Film ◽  
Hybrid Films ◽  
Substrate Roughness ◽  
Water Penetration ◽  
Breath Figures ◽  
Ordered Porous

A highly ordered open-pore hybrid film was fabricated by controlling the substrate roughness and wettability. The composite with different wettability on the two side resulted in an attractive unidirectional water-penetration function (see figure).

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.

The preparation of poly(methylsilsesquioxane) network-polyimide hybrid materials by the sol-gel process and their properties

1994 ◽  
Vol 6 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Yoshitake Iyoku ◽  
Masa-aki Kakimoto ◽  
Yoshio Imai
Keyword(s):  
Hybrid Materials ◽  
Sol Gel ◽  
Tensile Modulus ◽  
Hybrid Films ◽  
Elongation At Break ◽  
Dimethyl Acetamide ◽  
Flexible Films ◽  
Sol Gel Process ◽  
Heating Up ◽  
Silicone Content

Poly(methylsilsesquixoane) network (silicone)-polyimide hybrid materials were successfully prepared by the sol-gel reaction of methyltriethoxysilane (MTES). The ethoxysilyl group in MTES was hydrolyzed and polycondensed in the solution of the polyamic acid, derived from pyromellitic dianhydride and bis(4-aminophenyl)ether, in N,N-dimethyl-acetamide (DMAc). The hybrid films were obtained by casting the reaction mixture, followed by heating up to 300°C. The hybrid materials containing 0-60wt% of silicone afforded flexible films. The films containing less than 7 wt% silicone were yellow and transparent, whereas the films with higher silicone content were yellow and opaque. Silicone particles with a diameter of around 1-10 μm were observed in the fracture surface of the hybrid films by scanning electron microscopy. Although the tensile strength and tensile modulus of the films obtained decreased with increasing silicone content. the value of the elongation at break remained at 60% up to 30% silicone content.

The preparation and characterization of transparent nano-sized thermochromic VO2–SiO2 films from the sol–gel process

2004 ◽  
Vol 347 (1-3) ◽  
pp. 138-143 ◽  
Author(s):  
Hua-Kuo Chen ◽  
Hsin-Chin Hung ◽  
Thomas C.-K. Yang ◽  
Sea-Fue Wang
Keyword(s):  
Sol Gel ◽  
Sio2 Films ◽  
Sol Gel Process
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