Identification of oxidation products and oxidation pathways of high molecular weight dicarboxylic acids under hydrothermal condition

2006 ◽  
Vol 39 (1) ◽  
pp. 80-88 ◽  
Author(s):  
Fangming Jin ◽  
Jianxun Cao ◽  
Heiji Enomoto ◽  
Takehiko Moriya
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Dicarboxylic Acids ◽  
Hydrothermal Condition ◽  
Oxidation Products

Spectral study on the oxidation products of conjugated dienes of high molecular weight

1965 ◽  
Vol 6 (1) ◽  
pp. 38-42
Author(s):  
R. M. Aseeva ◽  
Yu. G. Aseev ◽  
A. A. Berlin ◽  
V. I. Kasatochkin
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Spectral Study ◽  
Conjugated Dienes ◽  
Oxidation Products

scholarly journals New 1,2,3-Triazole Containing PolyestersviaClick Step-Growth Polymerization and Nanoparticles Made of Them

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Tengiz Kantaria ◽  
Temur Kantaria ◽  
Giorgi Titvinidze ◽  
Giuli Otinashvili ◽  
Nino Kupatadze ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Sodium Azide ◽  
Dicarboxylic Acids ◽  
Solution Concentration ◽  
One Pot ◽  
Bromoacetic Acid ◽  
Aliphatic Polyesters ◽  
Step Growth ◽  
Step Growth Polymerization

High-molecular-weight AA-BB-type aliphatic polyesters were synthesizedviaCu(I)-catalyzed click step-growth polymerization (SGP) following a new synthetic strategy. The synthesis was performed between diyne and diazide monomers in an organic solvent as one pot process using three components and two stages. The dipropargyl esters of dicarboxylic acids (component 1) were used as diyne monomers, di-(bromoacetic acid)-alkylene diesters (component 2) were used as precursors of diazide monomers, and sodium azide (component 3) was used for generating diazide monomers. The SGP was carried out in two steps: at Step  1 dibromoacetates interacted with two moles of sodium azide resulting in diazide monomers which interacted in situ with diyne monomers at Step  2 in the presence of Cu(I) catalyst. A systematic study was done for optimizing the multiparameter click SGP in terms of the solvent, duration of both Step  1 and Step  2, solution concentration, catalyst concentration, catalyst and catalyst activator (ligand) nature, catalyst/ligand mole ratio, and temperature of both steps of the click SGP. As a result, high-molecular-weight (MWup to 74 kDa) elastic film-forming click polyesters were obtained. The new polymers were found suitable for fabricating biodegradable nanoparticles, which are promising as drug delivery containers in nanotherapy.

The composition of grape cuticle wax

1965 ◽  
Vol 18 (7) ◽  
pp. 1059 ◽  
Author(s):  
F Radler ◽  
DHS Horn
Keyword(s):  
Fatty Acids ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Oleanolic Acid ◽  
Light Petroleum ◽  
Oxidation Products ◽  
Straight Chain ◽  
Neutral Alumina ◽  
Chain Lengths ◽  
Long Chain

The cuticle wax of the grape is composed of a soft wax (30%) readily removed by light petroleum and a hard wax (30%), mainly oleanolic acid, removed by chloroform. The soft wax of the fresh grape is composed chiefly of long-chain alcohols together with smaller amounts of aldehydes, esters, fatty acids, hydrocarbons, oleanolic acid, and small amounts of high molecular weight substances. The soft wax of dried grapes is similar in composition but contains no aldehydes and larger amounts of high molecular weight substances and oxidation products. The aldehydes, unusual wax components, are straight chain and range from C16 to C32 with the even chain-lengths predominating. They were destroyed by neutral alumina but can be chromatographed on silicic acid.

The distribution of oxidation products in irradiated ultra-high molecular weight polyethylene

1995 ◽  
Vol 49 (2) ◽  
pp. 239-244 ◽  
Author(s):  
P. O'Neill ◽  
C. Birkinshaw ◽  
J.J. Leahy ◽  
M. Buggy ◽  
T. Ashida
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Oxidation Products ◽  
Ultra High Molecular Weight

Oxidation reaction of high molecular weight dicarboxylic acids in sub- and supercritical water

2008 ◽  
Vol 44 (3) ◽  
pp. 331-340 ◽  
Author(s):  
Fangming Jin ◽  
Jianxun Cao ◽  
Atsushi Kishita ◽  
Heiji Enomoto ◽  
Takehiko Moriya
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Supercritical Water ◽  
Oxidation Reaction ◽  
Dicarboxylic Acids

scholarly journals Dependence of particle nucleation and growth on high molecular weight gas phase products during ozonolysis of α-pinene

2013 ◽  
Vol 13 (4) ◽  
pp. 9319-9354 ◽  
Author(s):  
J. Zhao ◽  
J. Ortega ◽  
M. Chen ◽  
P. H. McMurry ◽  
J. N. Smith
Keyword(s):  
Molecular Weight ◽  
Gas Phase ◽  
High Molecular Weight ◽  
Mass Range ◽  
Oxidation Products ◽  
Ionization Mass ◽  
Particle Nucleation ◽  
Acid Vapor ◽  
Molecular Weights ◽  
20 Nm

Abstract. We report the first time-dependent measurements of high molecular weight (up to 700 amu) gas-phase oxidation products from α-pinene ozonolysis in an aerosol chamber under dry and low NOx conditions. Measurements of products having mole fractions ranging from 10−14 to −11 were carried out with a chemical ionization mass spectrometer (the Cluster CIMS). Most products that were correlated with number concentrations of the smallest particles measured (10–20 nm) had molecular weights in the 430–560 amu range. Those products are proposed to be likely responsible for the initial nuclei formation and the early growth of the freshly-nucleated particles based on their high molecular weights and chemical identities, both of which suggest low volatility compounds. Another group of oxidation products in the lower mass range of 140–380 amu was well correlated with particles larger than 20 nm. We postulate that those products contributed to the later growth of particles (i.e. larger than 20 nm in diameter). Although particle nucleation in this study was primarily due to condensation of oxidation products from α-pinene ozonolysis, the involvement of residual sulfuric acid vapor in particle nucleation cannot be totally excluded.

Preparation of high molecular weight compounds on the basis of cyclic imides and diimides of dicarboxylic acids

2007 ◽  
Vol 16 (3) ◽  
pp. 1631-1646 ◽  
Author(s):  
T. V. Sheremeteva ◽  
G. N. Larina ◽  
M. G. Zhenevskaya ◽  
V. A. Gusinskaya
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Dicarboxylic Acids ◽  
Cyclic Imides
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