Low-temperature chemical vapour curing using iodine for fabrication of continuous silicon carbide fibres from low-molecular-weight polycarbosilane

2014 ◽  
Vol 2 (8) ◽  
pp. 2781 ◽  
Author(s):  
Junsung Hong ◽  
Kwang-Yeon Cho ◽  
Dong-Geun Shin ◽  
Jeong-Il Kim ◽  
Sung-Tag Oh ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Silicon Carbide ◽  
Low Temperature ◽  
Chemical Vapour ◽  
Low Molecular Weight

Influence of low-molecular-weight copolymers of ethylene with vinyl acetate on the low-temperature properties of diesel fuel

1974 ◽  
Vol 10 (8) ◽  
pp. 615-618 ◽  
Author(s):  
G. G. Krasnyanskaya ◽  
B. V. Gryaznov ◽  
V. A. Kryunina ◽  
S. L. Lyubimova ◽  
V. N. Monastyrskii ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
Vinyl Acetate ◽  
Diesel Fuel ◽  
Low Molecular Weight

scholarly journals Low-temperature dynamics in amorphous polymers and low-molecular-weight glasses—what is the difference?

2011 ◽  
Vol 13 (5) ◽  
pp. 1843-1848 ◽  
Author(s):  
Ivan Yu. Eremchev ◽  
Yury G. Vainer ◽  
Andrei V. Naumov ◽  
Lothar Kador
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
Amorphous Polymers ◽  
Low Molecular Weight ◽  
Temperature Dynamics ◽  
The Difference

Ceramic Coatings on Graphite via Polymer Vapor Pyrolysis Deposition Process

2008 ◽  
Vol 368-372 ◽  
pp. 1297-1299
Author(s):  
Xin Xing ◽  
Lin Liu ◽  
Xiao Zhong Huang ◽  
Xiao Dong Li
Keyword(s):  
Molecular Weight ◽  
Silicon Carbide ◽  
Pyrolysis Temperature ◽  
Deposition Process ◽  
Ceramic Coatings ◽  
Low Molecular Weight ◽  
Carbide Coatings ◽  
N2 Atmosphere ◽  
Amorphous Sic ◽  
Sic Coatings

Silicon carbide coatings on graphite were prepared through polymer vapor pyrolysis deposition process (PVPD) under N2 atmosphere. During this process, some low molecular weight substances that polycarbosilane (PCS) pyrolyzed can be deposited on graphite, and they can convert into SiC in high temperature. The results of XRD showed that amorphous SiC coatings were formed on graphite when the pyrolysis temperature was 1000°C, andβ-SiC phase formed in the coatings when the temperature up to 1250°C. Effects of the coatings on the microstructure and properties were investigated. It was shown that the uniform dense SiC coatings could be obtained by carefully controlling the pyrolysis temperature and ramping rate when the number molecular weight of PCS was in the range of 1,000~1,500.

scholarly journals The Distribution of Gases within the Combustion Coal of a Cigarette

1973 ◽  
Vol 7 (2) ◽  
Author(s):  
R.R. Baker ◽  
K.D. Kilburn
Keyword(s):  
Molecular Weight ◽  
Carbon Monoxide ◽  
High Temperature ◽  
Low Temperature ◽  
Temperature Region ◽  
Low Molecular Weight ◽  
Mainstream Smoke ◽  
Carbon Oxides ◽  
Sampling Probe ◽  
Combustion Region

AbstractMeasurements have been made of the distribution of temperature and low molecular weight gases within a burning cigarette, using a sampling probe coupled directly to a mass spectrometer (or Bosch carbon monoxide meter). The interior of the combustion coal is effectively an oxygen-deficient pyrolytic region. The oxides of carbon are produced in two distinct regions: a high-temperature (about 400-800°C) combustion region and a low- temperature (about 150-400°C) pyrolysis region. In the high-temperature coal the carbonised tobacco acts very much as a classical oxidizing solid fuel bed of carbon to give the two carbon oxides (and water). In the low-temperature region behind the coaI tobacco decomposes to give a substantiaI proportion of the carbon oxides and a major proportion of the hydrocarbons found in mainstream smoke.

An Inorganic Rubber

1932 ◽  
Vol 5 (4) ◽  
pp. 585-586
Author(s):  
Paul Renaud
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Low Temperature ◽  
Osmotic Pressure ◽  
The Other ◽  
Low Molecular Weight ◽  
Solid Mixture

Abstract The hypotheses generally accepted for the structure of gels explain these phenomena in detail. The trimer, polymerized by heating, gives rise to chains of different sizes, which are able to unite and form a network. The latter contains in its meshes the trimer which has not reacted, and also polymers of low molecular weight. According to whether the latter form a liquid or solid mixture, the gum is optically liquid or solid. At low temperature, the network itself assumes a rigidity which it communicates to the entire mass. The thermo-mechanical properties show that this is true of all the gums. The presence of the network has little influence on the fusion of the intercellular product, whereas its influence on vaporization is great; in fact, the volume is as little affected by fusion as it is greatly changed by vaporization. It must therefore be the case that rupture of the meshes by pressure is more rapid than their formation by polymerization. The influence of benzine and of water, one of which dissolves the intercellular products and the other does not, shows the influence of osmotic pressure, to which Duclaux (see Bull. soc. chim., 33, 36 (1923)) has called attention.

Sign in / Sign up

Export Citation Format

Share Document