Effects of ultralow concentration MXene (nano-Ti3C2Tx) on the electric and physical properties of ternary polyvinyl alcohol composites

Author(s):  
Yunyun Yang ◽  
Yujia Liu ◽  
Xufu Cai
2012 ◽  
Vol 7 (1) ◽  
pp. 155892501200700 ◽  
Author(s):  
Arunangshu Mukhopadhyay ◽  
Saiyed Muzffar Ishtiaque ◽  
Devanand Uttam

In the present study impact of structural variations on pre-hollow/micro-porous yarn's tensile and physical properties were investigated in view of their processing and ultimate product quality. The results show that: the core pre-hollow yarns and doubled pre-hollow yarns possessing continuous polyvinyl alcohol (PVA) filaments are better in tensile behavior than blended pre-hollow yarns which contain discrete PVA staple fibers. The doubled pre-hollow yarns were found to have the lowest unevenness, thick places, thin places and total imperfections followed by blended pre-hollow and core pre-hollow yarns, while blended pre-hollow yarns showed lowest number of neps. The core pre-hollow yarns exhibit lowest hairiness followed by blended pre-hollow yarns and doubled pre-hollow yarns. Use of double roving during spinning is beneficial for improving yarn strength, unevenness imperfections and hairiness in all the pre-hollow yarns.


2021 ◽  
Vol 19 (1) ◽  
pp. 49-56
Author(s):  
Sanaa S. Najm

A polymer blends (PVA/PEG) have been prepared at various concentrations(6%, 8%, 10%, 12%, and 14%) g /ml by dissolving different weights from the powders{Pva and Peg}.The behavior of this mixture has been studied utilize some physical properties such as ultrasonic absorption coefficient, relaxation amplitude, specific acoustic Impedance, compression, bulk modulus, shear viscosity, and Reduced viscosity. The outcomes referenced that each of these characteristics increased with increasing concentration of polymeric solutions, "while compressibility decreased with increasing concentration solutions".


2009 ◽  
Vol 55 (2) ◽  
pp. 85-91
Author(s):  
Hirotaka Yoshizawa ◽  
Masaaki Yamada ◽  
Kinji Taki

2012 ◽  
Vol 262 ◽  
pp. 486-490
Author(s):  
Zheng Jian Zhang ◽  
Yu Tong Han ◽  
Yun Zhi Chen

In order to improve the physical and color laser printing properties of paper, the polyvinyl alcohol and silica were used for pigmental surface sizing of paper. Under the previous conditions of solid content 12% and 14%, the effects of different ratio of PVA and silica such as 100:0, 15:1, 10:1, 5:1, and 1:1 on the physical properties of paper and laser printing performance were investigated. The brightness, opacity, roughness, color density, gray scale and image definition were measured after the surface sizing paper was calendared under the condition of temperature 70°C and pressure 4MPa. When the solid content was 12%, PVA: SiO2 was 1:1 and the solid content was 14%, PVA:SiO2 was 10:1, the brightness and opacity of paper obtained the maximum values. With the increase of silica proportion roughness increased at first and then decreased. Color density and tone reproducibility of paper was significantly improved by the pigmental sizing treatment as well as the dots and lines definition. The reasonable pigmental sizing scheme was as follow: solid content was 12%, PVA:SiO2 was 1:1, sizing temperature was 60°C, calendar temperature was 70°C and calendar pressure was 4MPa.


2018 ◽  
Vol 16 (2) ◽  
pp. 181 ◽  
Author(s):  
Kendri Wahyuningsih ◽  
Evi Savitri Iriani ◽  
Farah Fahma

 Cellulose from pineapple leaf fibers as one of the natural polymer which has biodegradable property in a nanometer’s scale, can be formed as a filler in composite of Poly(vinyl) Alcohol/PVA is expected to increase the physical, thermal, and barrier properties of composite films similar to conventional plastic. The aim of this study was to examine the effect of fibrillation of cellulose fibers from pineapple leaf fibers using a combined technique of chemical-mechanical treatments, to investigate the reinforcing effect of concentration of nanocellulose fibrils in the polyvinyl alcohol (PVA) matrix on physical properties, thermal properties, water vapor transmission rate, light transmittance and morphological with and without addition of glycerol. Nanocellulose was made from cellulose of pineapple leaf fiber using wet milling (Ultra Fine Grinder). The composite film production was carried out by using casting solution method by mixing PVA solution with nanocellulose (10-50%) and glycerol (0-1%). The characterization of film covered physical properties (thickness, moisture content and density), thermal properties, permeability (WVTR), light transmittance, morphology, and crystallinity. Nanocellulose from pineapple leaf fibers was produced by Ultra Fine Grinder shows that the size reduction process was accurate. Nanocellulose addition on PVA composite film was affected to increasing the physical, thermal, and barrier properties. Meanwhile, decreasing the percentage of composite film transmittance, thus the transparency decrease (opaque). Water vapor transmission rate (WVTR) the film was increased with increasing glycerol concentration, but the physical and thermal properties was decreased.


1991 ◽  
Vol 45 (11) ◽  
pp. 1255-1260
Author(s):  
Satoshi Fukuoka ◽  
Hiroshi Kamishima ◽  
Yoshinari Kobayashi

2021 ◽  
Vol 2129 (1) ◽  
pp. 012057
Author(s):  
Rathesh Kumaran Ulaganathan ◽  
Nur Aiman Mohamad Senusi ◽  
An’Amt Mohamed Noor ◽  
Wan Nazwanie Wan Abdullah ◽  
Mohamad Asyraf Mohd Amin ◽  
...  

Abstract This research was targeted to use the planetary ball milling method to extract cellulose nanofibers (CNFs) from commercial microcrystalline cellulose and also to utilize the obtained extracted cellulose nanofibers (CNFs) as reinforcement in polyvinyl alcohol (PVA) thin film. The effect of cellulose nanofibers (CNFs) on the mechanical and physical properties of polyvinyl alcohol (PVA) thin films was investigated. As a result of the study, we found that the thin film’s tensile strength is good, and the surface morphology of the CNFs suspension enhances the bonding between the PVA and the reinforcement. Tyndall effect was accurate with the visible light scattering through CNF suspension, and the CNF/PVA thin film exhibited transparent thin film. In contrast, the CNF/PVA composite’s mechanical and physical properties are good due to the excellent dispersion and absence of agglomeration of CNFs. The prepared PVA/CNF biocomposite would be a suitable candidate to be implemented as biodegradable food packaging material.


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