Improving hydraulic permeability, mechanical properties, and chemical functionality of cellulose acetate-based membranes by co-polymerization with tetraethyl orthosilicate and 3-(aminopropyl)triethoxysilane

2021 ◽  
Vol 261 ◽  
pp. 117813
Author(s):  
Mônica C. Andrade ◽  
José Carlos Pereira ◽  
Nuno de Almeida ◽  
Paula Marques ◽  
Mónica Faria ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cellulose Acetate ◽  
Tetraethyl Orthosilicate ◽  
Hydraulic Permeability ◽  
Chemical Functionality

scholarly journals Transition Sandwich Janus Membrane of Cellulose Acetate and Polyurethane Nanofibers For Oil-Water Separation

2021 ◽  
Author(s):  
Yong Zhang ◽  
Mei Yang ◽  
Yuan Zhou ◽  
Anrong Yao ◽  
Yanting Han ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cellulose Acetate ◽  
Transition Layer ◽  
Separation Efficiency ◽  
Hydraulic Permeability ◽  
Membrane Thickness ◽  
Nanofiber Membrane ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water

Abstract Through sequential electrospinning, a sandwich Janus membrane (PU-(CA/PU)-CA) was constructed with hydrophobic polyurethane (PU) nanofiber membrane as the top layer, cellulose acetate/polyurethane (CA/PU) blend nanofiber membrane as the intermediate transition layer and hydrophilic cellulose acetate (CA) nanofiber membrane as the bottom layer. The effects of membrane structure, composition and thickness on the mechanical properties, permeability and separation ability of PU-(CA/PU)-CA nanofiber membrane were studied. The results show that the transition sandwich structure PU-(CA/PU)-CA membrane has good mechanical properties, high permeability and selective separation ability, and can realize the unidirectional transmission of water and efficient oil-water separation. When the membrane thickness is 80 μm, the hydraulic permeability is 3.4×104 L/(m2 h bar), the oil-water separation efficiency reaches 99%, and the tensile strength is 95.8% higher than that of the double-layer PU-CA membrane without intermediate transition layer. The thermal stability and antifouling ability of PU-(CA/PU)-CA nanofiber membrane have also been improved, and the reusability is good. CA/PU transition interlayer improves the interfacial compatibility between CA and PU nanofiber membrane, enhances the performance of PU-(CA/PU)-CA nanofiber Janus membrane, and shows its application prospect in the field of separation and purification.

Active cellulose acetate‐oregano essential oil films to conservation of hamburger buns: Antifungal, analysed sensorial and mechanical properties

2021 ◽  
Author(s):  
Flávio Gomes Fernandes ◽  
Cristiani Viegas Brandão Grisi ◽  
Raunira Costa Araújo ◽  
Diego Alvarenga Botrel ◽  
Solange Sousa
Keyword(s):  
Mechanical Properties ◽  
Essential Oil ◽  
Cellulose Acetate ◽  
Oregano Essential Oil ◽  
Oil Films

Polyethylene oxide additives as a factor in the structural and mechanical properties of cellulose acetate spinning solutions and fibres

1972 ◽  
Vol 2 (5) ◽  
pp. 464-467
Author(s):  
M. V. Polovnikova ◽  
V. A. Kozyrev ◽  
V. K. Pshedetskaya ◽  
R. I. Khomenko ◽  
I. Z. Zakirov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cellulose Acetate ◽  
Polyethylene Oxide

Composite Systems of Lignocellulosics with Synthetic Polymers

1990 ◽  
Vol 197 ◽  
Author(s):  
Ramani Narayan ◽  
Robert P. Neu
Keyword(s):  
Mechanical Properties ◽  
Interfacial Tension ◽  
Cellulose Acetate ◽  
Thermal Analyses ◽  
Synthetic Polymers ◽  
Synthetic Polymer ◽  
Composite Systems ◽  
Morphological Studies ◽  
Type Of Behavior ◽  
Poor Adhesion

ABSTRACTIncompatible polymer blends are known to have inadequate mechanical properties due to poor adhesion and high interfacial tension between the phases. One such blend that displays this type of behavior is the cellulose acetate-polystyrene blend and is typical of lignocellulosic-synthetic polymer blend systems. Tailor-made cellulose acetate-polystyrene graft copolymers have been synthesized and used as compatibilizers (emulsifiers) to reduce the interfacial tension and improve interfacial mixing. Thermal analyses and morphological studies of the blends with and without the graft copolymer demonstrated that this was indeed the case.

scholarly journals Synthesis and Characterization of Novel Integral Asymmetric Monophasic Cellulose–Acetate/Silica/Titania and Cellulose–Acetate/Titania Membranes

Membranes ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 195 ◽  
Author(s):  
Inês Peixoto ◽  
Mónica Faria ◽  
M. Clara Gonçalves
Keyword(s):  
Cellulose Acetate ◽  
Phase Inversion ◽  
Sol Gel ◽  
Asymmetric Structure ◽  
Hydraulic Permeability ◽  
Icp Oes ◽  
Phase Inversion Technique ◽  
In Series ◽  
Covalently Bound

Two series of novel integral asymmetric monophasic hybrid membranes, cellulose acetate/silica/titania (CA/SiO2/TiO2—series 1) and cellulose acetate/titania (CA/TiO2—series 2), were developed by the coupling of sol-gel technology and a modified version of the phase inversion technique. SEM micrographs confirmed the integral asymmetric structure of all membranes. ATR-FTIR and ICP-OES results showed that, for the membranes in series 1, TiO2 is covalently bound to SiO2, which, in turn, is covalently bound to CA, while for the membranes in series 2, TiO2 is directly and covalently bound to the CA matrix. Permeation experiments revealed that the permeation performance of the membranes in series 1 is unaffected by the introduction of TiO2. In contrast, the introduction of TiO2 in the series 2 membranes increased the hydraulic permeability by a factor of at least 2 when compared to the pristine CA membrane and that incremental additions of TiO2 further increased the Lp.

scholarly journals Direct Electrospinning of Cellulose Acetate onto Polyurethane Sheet and Effect of Its Saponification on Mechanical Properties

2019 ◽  
Vol 39 (4) ◽  
pp. 282-295 ◽  
Author(s):  
Md. Momotaz Ali ◽  
Nutthira Pakkang ◽  
Shogo Taira ◽  
Keiichi Koda ◽  
Koki Itoyama ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cellulose Acetate
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