scholarly journals Inorganic polymers

2020 ◽  
Author(s):  
Utsav Poudel
Keyword(s):  
High Temperature ◽  
Inorganic Polymers ◽  
Organic Polymers

Inorganic polymers are macromolecules composed of atoms other than carbon in main or backchain linked together by single or double covalent bonds.Inoranic polymers are stronger, harder and brittle than organic polymers. At high temperature they become soft ie. Melt but do not burn.

scholarly journals Organic Polymers Reinforced Inorganic Polymers - An Overview

2018 ◽  
Vol 416 ◽  
pp. 012090
Author(s):  
K Korniejenko ◽  
B Tyliszczak ◽  
M Łach ◽  
J Mikuła ◽  
M Hebdowska-Krupa ◽  
...  
Keyword(s):  
Inorganic Polymers ◽  
Organic Polymers

scholarly journals Unprecedented high-temperature CO2 selectivity in N2-phobic nanoporous covalent organic polymers

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Hasmukh A. Patel ◽  
Sang Hyun Je ◽  
Joonho Park ◽  
Dennis P. Chen ◽  
Yousung Jung ◽  
...  
Keyword(s):  
High Temperature ◽  
Organic Polymers ◽  
Co2 Selectivity

The Catalytic Synthesis of Inorganic Polymers for High Temperature Applications and as Ceramic Precursors

1989 ◽  
Vol 171 ◽  
Author(s):  
Jeffrey A. Rahn ◽  
Richard M. Laine ◽  
Zhi-Fan Zhang
Keyword(s):  
High Temperature ◽  
Glass Fibers ◽  
Temperature Stability ◽  
Industrial Applications ◽  
Catalyst Precursor ◽  
Inorganic Polymers ◽  
High Temperature Stability ◽  
Nmr Studies ◽  
Black Glass ◽  
Ceramic Precursors

AbsractPolysilsesquioxanes,-[RSi(O)1.5 ]x-, exhibit many properties that are potentially quite useful for industrial applications. These properties include high temperature stability (−600°C in O2); good adhesion and, liquid crystal-like behavior for some derivatives. Moreover, [MeSi(O)l.5]x, polymethylsilsesquioxane has been used successfully as a precursor for the fabrication of carbon fiber/“black glass” (SiO2/SiC/C) composites and “black glass” fibers.Current methods of preparation depend on hydrolysis of RSiCl3 or RSi(OR)3. Unfortunately, this approach leads to several products that are difficult to purify because polysilsesquioxanes exhibit a great propensity for forming gels. We describe here a simple catalytic approach to the synthesis of polymethylsilsesquioxane copolymers of the type -[MeRSiO].3[MeSi(O)1.5].7- where R - H, OMe, OEt, OnPr and OnBu. The R - H copolymer is produced by catalytic redistribution of -[MeHSiO]xoligomers using dimethyltitanocene, Cp2TiMe2 as the catalyst precursor.Following catalytic redistribution, the resulting copolymer, -[MeHSiO].3[MeSi(O)1.5].7−, is reacted in situ with alcohols to produce -[Me(R'O)SiO].3[MeSi(0)1.5].7− (where R' - Me, Et, nPr and nBu) which serve as masked forms of the polymethylsilsesquioxane. These new copolymers have been characterized by 1H, 13C and 29Si NMR TGA and DTA. The NMR studies allow us to assign structures for the copolymer.These new copolymers exhibit improved tractability. Their high temperature properties are all quite similar; although, the MeO-, EtO- and especially the nPrO- derivatives give much higher ceramic yields than expected.

scholarly journals Whole ceramic-like microreactors from inorganic polymers for high temperature or/and high pressure chemical syntheses

Lab on a Chip ◽  
2014 ◽  
Vol 14 (4) ◽  
pp. 779-786 ◽  
Author(s):  
Wurong Ren ◽  
Jayakumar Perumal ◽  
Jun Wang ◽  
Hao Wang ◽  
Siddharth Sharma ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Organic Polymer ◽  
Inorganic Polymers ◽  
Pressure Chemical

Whole ceramic-like microreactors fabricated from inorganic polymers could outperform any organic polymer derived reactors under challenging conditions.

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

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