scholarly journals CELLULOSE DERIVATIVES BY ETHERS

THE GENESIS ◽  
2020 ◽  
Vol 7 (3) ◽  
Author(s):  
Mr. Dugga aneel kumar
Keyword(s):  
High Pressure ◽  
Hydroxypropyl Methylcellulose ◽  
Thermal Conditions ◽  
Hydroxypropyl Cellulose ◽  
Alkali Metal Hydroxide ◽  
Hydroxyethyl Cellulose ◽  
Cellulose Derivatives ◽  
Powdered Cellulose ◽  
Viscosity Parameter ◽  
Epoxide Compound

ABSTRACT Powdered cellulose etherified to primary, secondary, tertiary, and combination of primary and tertiary carbons contains halide or an epoxide compound obtains Methylcellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methylcellulose (OH group replaced to OR) in presence of an alkali metal hydroxide in high pressure and thermal conditions, also produced to different grades where you played a viscosity parameter. Key Words: cellulose, alkali cellulose, etherfication.

scholarly journals Hetero-Diels–Alder reactions of hetaryl and aryl thioketones with acetylenic dienophiles

2015 ◽  
Vol 11 ◽  
pp. 576-582 ◽  
Author(s):  
Grzegorz Mlostoń ◽  
Paulina Grzelak ◽  
Maciej Mikina ◽  
Anthony Linden ◽  
Heinz Heimgartner
Keyword(s):  
High Pressure ◽  
Room Temperature ◽  
Thermal Conditions ◽  
Alder Reaction ◽  
Diels Alder ◽  
Hydrogen Shift ◽  
Diels Alder Reaction ◽  
Shift Sequence

Selected hetaryl and aryl thioketones react with acetylenecarboxylates under thermal conditions in the presence of LiClO4 or, alternatively, under high-pressure conditions (5 kbar) at room temperature yielding thiopyran derivatives. The hetero-Diels–Alder reaction occurs in a chemo- and regioselective manner. The initially formed [4 + 2] cycloadducts rearrange via a 1,3-hydrogen shift sequence to give the final products. The latter were smoothly oxidized by treatment with mCPBA to the corresponding sulfones.

Properties of Composite Films of Hydroxyethyl Cellulose and Hydroxypropyl Cellulose with Poly-N-methyl-N-vinylacetamide

2018 ◽  
Vol 60 (6) ◽  
pp. 788-795
Author(s):  
A. M. Bochek ◽  
I. L. Shevchuk ◽  
I. I. Gavrilova ◽  
M. F. Lebedeva ◽  
V. K. Lavrent’ev ◽  
...  
Keyword(s):  
Composite Films ◽  
Hydroxypropyl Cellulose ◽  
Hydroxyethyl Cellulose

scholarly journals Skin and bubble formation in films made of methyl nanocellulose, hydrophobically modified ethyl(hydroxyethyl)cellulose and microfibrillated cellulose

Cellulose ◽  
2020 ◽  
Author(s):  
Johanna Lyytikäinen ◽  
Maria Morits ◽  
Monika Österberg ◽  
Isto Heiskanen ◽  
Kaj Backfolk
Keyword(s):  
Methyl Cellulose ◽  
Microfibrillated Cellulose ◽  
Hydroxyethyl Cellulose ◽  
Effect Of Temperature ◽  
Cellulose Derivatives ◽  
Air Bubbles ◽  
Oxygen Transmission Rate ◽  
Hydrophobically Modified ◽  
Film Forming ◽  
Ethyl Hydroxyethyl Cellulose

AbstractThe use of nanomaterials and polymers from renewable resources is important in the search for sustainable alternatives to plastic-based packaging materials and films. In this work, self-supporting thin films prepared from derivatized and non-derivatized nanocellulose and cellulose derivatives were studied. The effect of drying temperature on the film-forming behavior of compositions comprising hydrophobically modified ethyl(hydroxyethyl)cellulose (EHEC), native microfibrillated cellulose (MFC) and nanocellulose made from methyl cellulose was determined. The interaction between the components was assessed from viscosity measurements made at different temperatures, the result being linked to a thermal-dependent association during liquid evaporation, and the subsequent barrier and film-forming properties. The effect of temperature on suspensions was clearly different between the materials, confirming that there were differences in interaction and association between EHEC–MFC and methyl nanocellulose–MFC compositions. The amphiphilic EHEC affected both the suspension homogeneity and the film properties. Air bubbles were formed under certain conditions and composition particularly in MFC films, dependent on the drying procedure. The presence of air bubbles did not affect the oxygen transmission rate or the oil and grease resistance. An increasing amount of MFC improved the oxygen barrier properties of the films.

Sign in / Sign up

Export Citation Format

Share Document