MoS2@ZIF-8 doped waterborne polyurethane membranes with water vapor permeable, lubricating, and antibacterial properties

2021 ◽  
Vol 161 ◽  
pp. 106465
Author(s):  
Chenglong Mu ◽  
Hua Chen ◽  
Xiaodan Sun ◽  
Guoqiang Liu ◽  
Kai Yan
Keyword(s):  
Water Vapor ◽  
Antibacterial Properties ◽  
Waterborne Polyurethane ◽  
Polyurethane Membranes

Polyurethane Electrospun Fiber Biomimetics Membrane for Constructing the Structure of Grain Layer with Good Breathability for Cattle Split Leather

2021 ◽  
Vol 116 (8) ◽  
Author(s):  
Nan Chen ◽  
Yanchun Li ◽  
Jianbo Qu ◽  
Jian-Yong Wang
Keyword(s):  
Water Vapor ◽  
Electrospun Fiber ◽  
Water Vapor Permeability ◽  
Waterborne Polyurethane ◽  
Vapor Permeability ◽  
High Porosity ◽  
Foam Layer ◽  
Fiber Morphology ◽  
Woven Structure ◽  
Superfine Fiber

The traditional thick coating on split leather does not have the ability to breathe like full grain leather.  The air and water vapor permeabilities of full grain leather are well known properties due to its fiber woven structure. Simulating the fiber morphology and weaving structure of the dermis or grain layer is very important to construct a top surface layer for split leather. In this paper, a PU (polyurethane) foam layer is put first on the split to enhance the adhesion of a second application of a superfine fibrous PU resin. This foam uses well-known waterborne polyurethane foaming technology. This dried foam has good breathability because of high porosity. A superfine fiber membrane is next put atop of the foam layer by using an electro-spun polyurethane resin. This second resin imitates collagen fibers in the network structure of the leathers’ grain layer. Thus, this resultant electrospun fiber biomimetics membrane simulated the grain layer of natural leather. SEM showed the morphology and structure of this electrospun fiber biomimetic membrane to be like that of the grain layer of natural leather. The porosity and apparent density were basically the same as the grain of leather, which were 63.65% and 583.878 kg/m3 respectively. The air and water vapor permeability of the biomimetics membrane were also as high as 2250 mL·cm-2·h-1 and 8753.02 μg·cm-2·h-1 respectively. Therefore, the biomimetics membrane largely restored the ability to breathe of split leather. Thus, this method simulates the performance and structure of full grain leather and is a novel method for industrial production

Influence of Low Temperature Plasma on Chitosan/ Waterborne Polyurethane Finishing on Cotton Fabric

2014 ◽  
Vol 1051 ◽  
pp. 117-120
Author(s):  
Wei Ling Wang ◽  
Wei Dong Yu
Keyword(s):  
Water Vapor ◽  
Volume Ratio ◽  
Water Vapor Permeability ◽  
Waterborne Polyurethane ◽  
Vapor Permeability ◽  
Temperature Plasma ◽  
Aqueous Emulsion ◽  
Recovery Performance ◽  
Pre Treatment ◽  
Property Changes

Waterborne polyurethane and chitosan were mixed in different volume ratio, and finished on the cotton of plasma pre-treatment and non-plasma pre-treatment to discuss the influence of plasma pretreatment on the properties of the fabric. Firstly, the mixed aqueous emulsion was made into film and analyzed by FTIR. Secondly, the relationship between the properties of whiteness, wrinkle recovery performance and water vapor permeability of the fabric that finished by the only blended solution and the mixed ratio was studied. Finally, the property changes between the pretreatment with and without plasma was compared. The results showed that, the blended film not only had both polyurethane and chitosan characteristic peaks, but also generated the new characteristic peaks; the three properties of the fabric that finished by the only blended solution changed with the mixed ratio; the plasma pre-treatment would increase the fabric’s whiteness, decrease wrinkle recovery performance, but the water vapor permeability would improve obviously.

scholarly journals Utilization Of Sugarcane Bagasse Cellulose-Clay Nanocomposite As A Biodegradable And Antibacterial Packaging Material To Extend The Food's Shelf Life

Khazanah ◽  
2020 ◽  
Vol 12 (2) ◽  
Author(s):  
Nadya Fitriani Pitaloka ◽  
◽  
Ardilla Sriwijayanti ◽  
Santi Anisa ◽  
Irne Dyah Ayu Wijayanti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Antibacterial Activity ◽  
Water Vapor ◽  
Shelf Life ◽  
Sugarcane Bagasse ◽  
Toxicity Test ◽  
Nanocomposite Film ◽  
Food Packaging ◽  
Antibacterial Properties ◽  
Vapor Permeability

Food packaging materials derived from fossil fuels are single-use products that harm the health of living things when disposed of by releasing toxic byproducts. Many communities are starting to be more environmentally friendly by using biopolymers. However, some biopolymers do not have antibacterial properties, thus shortening the food’s shelf life and not applicable in food packaging. Therefore, the purpose of this work is to develop a biodegradable and antimicrobial food packaging from sugarcane bagasse and clay that degrades over time without compromising the food’s shelf life. Cellulose acetate butyrate (cab) was prepared in an amimcl ionic liquid system from sugarcane bagasse. Then the cab was plasticized using peg, resulting a film. Besides, montmorillonite (mmt) clay was modified with aryl ammonium cations using a cation exchange technique to form bmmt. The nanocomposite film was prepared by mixing the plasticized cab and bmmt, then heated at 50c to evaporate the solution. The nanocomposite film was obtained as a prototype of food packaging. Several tests were conducted including mechanical properties, water vapor permeability (wvp), antimicrobial and toxicity test. Based on research by saha et.al, 2008, the nanocomposite film with the cag, peg and bmmt 100:20:3 composition gave the best mechanical properties because of the agglomeration of bmmt. Also, the nanocomposite film had promising wvp properties as a plastic because the clay layers reduced the water vapor diffusion across the polymer matrix. The toxicity test showed that this nanocomposite film was compatible in human blood. Lastly, this nanocomposite film has antibacterial activity against b. Subtilis and p. Cepacia because of the bmmt presence. In conclusion, the nanocomposite film from sugarcane bagasse and clay containing cag, peg and bmmt 100:20:3 is a promising material for a biodegradable and antimicrobial food packaging, because it has sufficient mechanical properties, antibacterial activity, low wvp and is non-toxic.

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