Nanofiber Formation in Regenerated Cellulose by Saponification of Cellulose Acetate Film

2011 ◽  
Vol 2 (1) ◽  
Author(s):  
Jaehwan Kim ◽  
Yi Chen
Keyword(s):  
Infrared Spectrum ◽  
Cellulose Acetate ◽  
Fourier Transformation ◽  
Sodium Methoxide ◽  
Methanol Solution ◽  
Regenerated Cellulose ◽  
Cross Sectional ◽  
High Mechanical Strength ◽  
Cellulose Acetate Film ◽  
Multiple Hydrogen Bonds

This paper reports a novel process of nanofiber formation in regenerated cellulose from cellulose acetate (CA) film by saponification and stretching. Saponification of CA film was performed using sodium methoxide in methanol solution. Regeneration of cellulose during the saponification of CA was verified by taking Fourier transformation infrared spectrum. Cross-sectional images of the saponified and stretched CA film revealed an aligned nanofiber structure. The Young’s modulus and ultimate strength were enhanced approximately 630% and 450%, respectively, which might be due to the formation of multiple hydrogen bonds after sodium methoxide treatment along with the nanofiber formation. Since the saponified CA films are transparent, biodegradable, and possess high mechanical strength, they can be used as a biomaterial.

scholarly journals Temperature Dependence of Limiting Fluorescence Anisotropy of POPOP in Cellulose Acetate Film

1985 ◽  
Vol 40 (6) ◽  
pp. 559-561
Author(s):  
A. Kawski ◽  
A. Kubicki ◽  
I. Weyna ◽  
I. Janić
Keyword(s):  
Temperature Dependence ◽  
Cellulose Acetate ◽  
Fluorescence Anisotropy ◽  
Thermal Relaxation ◽  
Effect Of Temperature ◽  
Torsional Vibrations ◽  
Slow Increase ◽  
Cellulose Acetate Film ◽  
Luminescent Centre

The effect of temperature (103 K < T < 303 K) upon the limiting fluorescence anisotropy r0 of POPOP was investigated in a cellulose acetate film. A slow increase in r0 was observed when reducing the temperature. Based on the Jabłoński theory, the frequency of the torsional vibrations of POPOP was determined to be w = 1.3 x 1012s−1. The depolarization due to these torsional vibrations was found to occur immediately following excitation during the thermal relaxation of the luminescent centre, thus somewhat lowering the value of the fundamental fluorescence anisotropy rf to the limiting r0 value.

scholarly journals Properties and applications of cellulose regenerated from cellulose/imidazolium-based ionic liquid/co-solvent solutions: A short review

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 869-880
Author(s):  
Ahmad Adlie Shamsuri ◽  
Khalina Abdan ◽  
Siti Nurul Ain Md. Jamil
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Cellulose Acetate ◽  
Processing Time ◽  
Short Review ◽  
Organic Liquids ◽  
Regenerated Cellulose ◽  
Solvent Mixtures ◽  
Different Types ◽  
Novel Applications

Abstract An improvement of ecological conscience currently has increased the consciousness of researchers in reducing the processing time and cost of solvent for the dissolution of cellulose. Latterly, ionic liquids have been employed to process cellulose as they are recyclable and nonvolatile. Besides that, biopolymers such as chitosan, chitin, starch, protein, and cellulose acetate can also be processed by using ionic liquids for diverse applications. In this short review, examples of imidazolium-based ionic liquids that are commonly used for the dissolution of cellulose are implied. Furthermore, examples of organic liquids that are utilized as co-solvents for ionic liquids were revealed. In addition, examples of imidazolium-based ionic liquid/co-solvent mixtures utilized in the dissolution of cellulose and other biopolymers are also demonstrated. The properties and applications of cellulose and its blends regenerated from different types of cellulose/imidazolium-based ionic liquid/co-solvent solutions are also shortly reviewed. The information acquired from this review gives a better understanding of the changes in the properties of regenerated cellulose and regenerated cellulose blends. In addition, this short review serves as a model basis for the creation of novel applications of regenerated cellulose and regenerated cellulose blends by utilizing imidazolium-based ionic liquid/co-solvent mixtures.

Biodegradation behavior of acid-containing cellulose acetate film in soil

2005 ◽  
Vol 98 (1) ◽  
pp. 466-473 ◽  
Author(s):  
Yoichiro Yamashita ◽  
Takeshi Endo
Keyword(s):  
Cellulose Acetate ◽  
Cellulose Acetate Film

Fabrication and Characterization of Regenerated Cellulose/TiO2 Nanocomposite Hybrid Fibers

2011 ◽  
Vol 418-420 ◽  
pp. 237-241 ◽  
Author(s):  
Shun Xin Shu ◽  
Chao Rong Li
Keyword(s):  
Cellulose Acetate ◽  
Low Cost ◽  
Structural Features ◽  
Regenerated Cellulose ◽  
Oxide Material ◽  
Hybrid Fibers ◽  
Transmission Electron ◽  
Nanocomposite Fibers ◽  
Fabrication And Characterization

Nanocomposite fibers are one of the most fascinating materials with broad applications. In the present work，nanocomposite fibers were prepared by a low-cost, simple, and “green” process. The nanocomposite of cellulose acetate/TiO2was realized by combining the functional oxide material TiO2with the regenerating electrospun cellulose acetate fibers. The structural features were characterized by scan electron microcopy, transmission electron microscopy and infrared spectrum. The compositing mechanism was proposed. The surface functionalized hydroxyl by the regenerating process plays an important role for the formation of hybrid material.

THE INTERACTION OF SILICON TETRAFLUORIDE WITH METHANOL

1963 ◽  
Vol 41 (6) ◽  
pp. 1477-1484 ◽  
Author(s):  
J. P. Guertin ◽  
M. Onyszchuk
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Absorption Band ◽  
Hydrogen Bonds ◽  
Infrared Spectrum ◽  
Proton Magnetic Resonance ◽  
Methanol Solution ◽  
Silicon Tetrafluoride ◽  
Conductivity Measurements ◽  
Bond Stretching

Silicon tetrafluoride reacts with methanol in a 1:4 mole ratio, forming the complex SiF4.4CH3OH, which freezes to a glass at about −20° and is completely dissociated in the gaseous phase at 25°. Conductivity measurements show clearly that it is a very weak electrolyte in methanol solution. Its infrared spectrum does not contain an Si—O bond stretching absorption band. Proton magnetic resonance measurements provide strong evidence of hydrogen bonding between silicon tetrafluoride and methanol. These results indicate that the structure of the complex requires tetracovalent rather than hexacovalent silicon and strong hydrogen bonds between methanol and each of the four fluorine atoms.

Angular dependence of 1H- and 2H-NMR spectra of H2O and D2O absorbed in cellulose acetate film

1987 ◽  
Vol 25 (10) ◽  
pp. 2149-2163 ◽  
Author(s):  
Kazunori Matsumura ◽  
Kikuko Hayamizu ◽  
Takashi Nakane ◽  
Hiroshi Yanagishita ◽  
Osamu Yamamoto
Keyword(s):  
Cellulose Acetate ◽  
Angular Dependence ◽  
Nmr Spectra ◽  
2H Nmr ◽  
Cellulose Acetate Film
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