scholarly journals Synthesis of Sulfoxide-Modified Cellulose Derivatives Designed for the Permselective Membrane of Sulfur Dioxide

1987 ◽  
Vol 60 (2) ◽  
pp. 753-757 ◽  
Author(s):  
Kiyokazu Imai ◽  
Yasuyuki Tezuka ◽  
Tomoo Shiomi ◽  
Matsunori Takada
Keyword(s):  
Sulfur Dioxide ◽  
Cellulose Derivatives ◽  
Permselective Membrane ◽  
Modified Cellulose

Synthesis of sulfoxide-modified ethylene—vinyl alcohol copolymers for the permselective membrane of sulfur dioxide

1992 ◽  
Vol 27 (4) ◽  
pp. 309-314 ◽  
Author(s):  
Kiyokazu Imai ◽  
Tomoo Shiomi ◽  
Yasuyuki Tezuka ◽  
Kiyotaka Inokami
Keyword(s):  
Sulfur Dioxide ◽  
Vinyl Alcohol ◽  
Ethylene Vinyl Alcohol ◽  
Permselective Membrane

scholarly journals Synthesis of selectively modified cellulose derivatives via reductive amination of 2-oxy- and 3-oxy-cellulose intermediates

1984 ◽  
Vol 62 (2) ◽  
pp. 260-262 ◽  
Author(s):  
Manssur Yalpani ◽  
Laurance D. Hall ◽  
Jacques Defaye ◽  
Andrée Gadelle
Keyword(s):  
Crown Ether ◽  
Reductive Amination ◽  
Ammonium Acetate ◽  
Water Soluble ◽  
Cellulose Derivatives ◽  
Oxidized Cellulose ◽  
Sodium Cyanoborohydride ◽  
Chromium Tricarbonyl ◽  
Derivatives Of ◽  
Modified Cellulose

Diamagnetic and paramagnetic amine derivatives of cellulose have been prepared from selectively oxidized cellulose precursors via the reductive amination method using sodium cyanoborohydride. 4-Amino-2,2,6,6-tetramethylpiperidine-1-oxyl was employed in the syntheses of nitroxide spin labelled cellulose derivatives 4 and 5 from 3-oxy-cellulose (1) and 6-O-triphenylmethyl-2-oxy-cellulose (2). Conversion of the linear polymer 1 into a highly branched, water soluble 3-deoxy-cellulose derivative 6 was accomplished by attachment of glucosamine side chains. 3-Amino-3-deoxy-cellulose 7 was obtained using ammonium acetate. A novel type of organometallic cellulose conjugate 8 was prepared by condensation of 2 and p-toluidine chromium tricarbonyl. Similarly, 1,10-diazo-18-crown-6 was added to 2 to form the crown ether derivative 9. The synthetic strategies involving either 6-O protected or unprotected oxy-cellulose intermediates are compared in terms of reaction yields and product properties.

Research Progress in Cellulose Extraction, Modification and Application

2016 ◽  
Vol 852 ◽  
pp. 1194-1200 ◽  
Author(s):  
Chao Liu ◽  
Zhi Tan ◽  
Hui Min Li ◽  
Zhi Wei Xie ◽  
Jin Ping Peng ◽  
...  
Keyword(s):  
Chemical Modification ◽  
Recent Progress ◽  
Research Progress ◽  
Cellulose Derivatives ◽  
Cellulose Modification ◽  
Urgent Task ◽  
Fossil Resource ◽  
Carbon Resource ◽  
Modified Cellulose ◽  
Research Hotspots

As the fossil resource supply situation become more serious and the increasingly serious environment problems, the development of new carbon resource utilization has become an urgent task. Plant cellulose is the most abundant natural resource, which is renewable, nontoxic and degradable, has been paid much attrition by researchers of many countries. This paper reviews recent progress in plant cellulose extract and modification, especially in chemical modification of cellulose derivatives. And the article described cellulose modification technology about pretreatment. The applications of modified cellulose in the field of environmental protection, pharmaceutical, paint and other industries introduced as well. Finally, the current research hotspots of cellulose modification technology were prospected.

scholarly journals SYNTHESIS AND ANTIRADICAL ACTIVITY OF HINDERED PHENOLIC DERIVATIVES OF FLAX CELLULOSE

2020 ◽  
pp. 47-54
Author(s):  
Sergey Vladimirovich Bukharov ◽  
Yuliya Maskhutovna Sadykova ◽  
Timur Erkinovich Umarov ◽  
Aleksandr Romanovich Burilov ◽  
Gul'nara Nailovna Nugumanova ◽  
...  
Keyword(s):  
Antiradical Activity ◽  
Acid Hydrazide ◽  
Analysis Data ◽  
Degree Of Substitution ◽  
Elemental Analysis Data ◽  
Cellulose Derivatives ◽  
Hindered Phenol ◽  
The Difference ◽  
Derivatives Of ◽  
Modified Cellulose

The modification of powdered ultradisperse cellulose by hindered phenol fragments was carried out. The modification was carried out by reacting cellulose tosylate with 3-(3',5'-ditert-butyl-4'-hydroxyphenyl) propionic acid hydrazide and 3,5-ditert-butyl-4-hydroxybenzyl dimethylamine in DMF at 100 ○C for 16–30 hours. Samples of modified cellulose were characterized by spectroscopy IR and 1H NMR. From the of elemental analysis data, the degree of substitution of cellulose derivatives by hindered phenol units was calculated. The antiradical activity of the obtained samples in their reactions with a stable radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) was determined. The reactions of modified cellulose with DPPH were carried out under the pseudo first-order conditions with respect to the radical. From the values of the effective constants, the second-order rate constants were calculated. It was established that the modification of cellulose by hindered phenol fragments leads to a sharp increase in its antiradical activity, which depends on the degree of substitution of the sample and the method of substitution. The difference in the activity of hydrazide and benzyl derivatives of cellulose may indicate their different spatial structure, resulting in different availability of phenol fragments. The antiradical activity of the hydrazide derivative of cellulose exceeds that of the antioxidant Ionol (2,6-ditert-butyl-4-methylphenol).

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