Effect of water state and polymer chain motion on the mechanical properties of a bacterial cellulose and polyvinyl alcohol (BC/PVA) hydrogel

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 25525-25531 ◽  
Author(s):  
Lifeng Li ◽  
Li Ren ◽  
Lin Wang ◽  
Sa Liu ◽  
Yongrou Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Polyvinyl Alcohol ◽  
Bacterial Cellulose ◽  
Polymer Chain ◽  
Effect Of Water ◽  
Water State ◽  
Pva Hydrogel

The effects of water state and polymer chain motion on the mechanical property of bacterial cellulose and a polyvinyl alcohol hydrogel.

scholarly journals Synthesis of cellulose from Acetobacter xylinum bacteria – application of making biocomposite based on polyvinyl alcohol/cellulose

2015 ◽  
Vol 18 (3) ◽  
pp. 114-124
Author(s):  
Hong Thi Thu Phan ◽  
Ngan Thi My Luong ◽  
Trung Tien Vu ◽  
Ho Thanh Pham ◽  
Huy Thuc Ha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Polyvinyl Alcohol ◽  
Mechanical Strength ◽  
Bacterial Cellulose ◽  
High Concentration ◽  
Thermogravimetric Analyzer ◽  
Plastic Materials ◽  
New Material ◽  
Biological Films

Bacterial cellulose (BC) is characterized for its high purity, good mechanical strength, non-toxic and non-allergic. Therefore, BC was used in many applications, such as biological films, paper, textiles, electronics, and especially in the biomedical field. The aim of this study is to make a new material which has high thermal stability and mechanical strength by combining BC and two kinds of polyvinyl alcohol (PVA 127 and PVA Kuraray). In the current study, it was found that the structure of bacterial cellulose was changed when PVA at different concentrations was supplied in the bacterial culture. The dispersity of BC fibers and the density of PVA particles of the material increased with high concentration of PVA. As a masterbatch (a composite additive material), a preparation of BC/PVA 217 was mixed with PVA Kuraray, and the mixture was then placed into a mixing chamber of an electrically heated machine (Hakke, Germany) at 170C, 80 rpm for 15 min. The melting mixture was shaped by a Hydraulic shaping machine. The structure of the material was assessed by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR). The thermal stability of the material was measured using a thermogravimetric analyzer, and its mechanical properties were also studied. The results showed that the compatibility of BC and PVA in PVA/BC material is relatively high due to intermolecular hydrogen bondings. The material showed better thermal stability than PVA only. Its mechanical properties were also improved. The finding suggests that the composites of bacterial cellulose and PVA could be good candidates for replacing traditional nonbiodegradable plastic materials.

Preparation and Properties of Polyvinyl Alcohol (PVA)/Polyvinyl Pyrrolidone (PVP) Hydrogel

2011 ◽  
Vol 84-85 ◽  
pp. 485-488 ◽  
Author(s):  
Shu Di Zhang ◽  
Yu Chun Zhai ◽  
Zhen Fang Zhang
Keyword(s):  
Mechanical Properties ◽  
Polyvinyl Alcohol ◽  
Room Temperature ◽  
Loss Rate ◽  
Polyvinyl Pyrrolidone ◽  
Swelling Properties ◽  
Swelling Equilibrium ◽  
Water Rate ◽  
Change Trend ◽  
Pva Hydrogel

Polyvinyl alcohol (PVA)/polyvinyl pyrrolidone (PVP) hydrogel has been fabricated using freezing-thawing method. The tensile strengthen and swelling properties were tested. The results show that hydrogels mechanical properties are better, reach to about 0.7 MPa, 15% PVA/10% PVP hydrogel is the best, up to 0.82MPa; swelling properties are better, The loss water rate and swelling percentage of hydro gel have similar change trend in the room temperature; When the swelling equilibrium, 10% PVA hydrogel loss water rate is very rapid, the swelling percentage of 15% PVA hydrogel is relatively rapid; The rate of loss water of all hydrogels are more than 70 percent, 10% PVA/3% PVP hydrogel loss water is the fastest, the loss rate is up to 90%; swelling percentage of all hydrogels are over 400%, 15%PVA/8% PVP hydrogel is the highest, close to 600%.

Synthesis and morphology control of nano-scaled magnesium hydroxide and its influence on the mechanical property and flame retardancy of polyvinyl alcohol

2019 ◽  
Vol 9 (6) ◽  
pp. 675-680
Author(s):  
Xiaodong Wang ◽  
Mingqing Yu ◽  
Lei Li ◽  
Xu Fan
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Reaction Time ◽  
Polyvinyl Alcohol ◽  
Composite Film ◽  
Magnesium Hydroxide ◽  
Flame Retardancy ◽  
Nanocomposite Film ◽  
Room Temperature ◽  
Precipitation Reaction

Nano-scaled magnesium hydroxide with the special appearance was synthesized by a water precipitation reaction at room temperature. The effects of surfactant, reaction time, reactant concentration on the morphology of nano-scaled magnesium hydroxide were investigated. The nanocomposite film was prepared by adding nano-sized magnesium hydroxide to polyvinyl alcohol. The mechanical property and flame retardancy of PVA nanocomposites were tested. The results showed that the mechanical properties and flame retardancy of the composite film were improved by adding nano-powders.

scholarly journals PENGARUH MEDIUM PERENDAM TERHADAP SIFAT MEKANIK, MORFOLOGI, DAN KINERJA MEMBRAN NATA DE COCO

Molekul ◽  
2008 ◽  
Vol 3 (1) ◽  
pp. 28 ◽  
Author(s):  
Senny Widyaningsih ◽  
Hartiwi Diastuti
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Bacterial Cellulose ◽  
Fermentation Process ◽  
Acetobacter Xylinum ◽  
Best Value ◽  
Structure Morphology ◽  
Water Based ◽  
And Performance

Nata de coco is bacterial cellulose which is produced by Acetobacter xylinum in fermentation process of coconut water. Based on its properties, nata de coco can be used as a membrane. Soaking medium in purification of nata de coco gel can influence structure, morphology, and performance of nata de coco membrane. First medium was NaOCl 0.05% and NaOH 5%, Second medium was ultrasonic. Third medium was NaOH 1% and CH3COOH 1%. Mechanical property were analysized based on its tensile strength. Morphology of membrane was analysized using SEM. Performance of membrane was determined based on its permeability. The result showed that nata de coco membrane which had the best value on mechanical properties, morphology, and performance was membrane in third medium.

Mechanical Property Studies on Flax Fiber Reinforced Basalt Powder Filled Polyester Composite

2020 ◽  
Vol 13 ◽  
Author(s):  
V. Arumugaprabu ◽  
K.Arun Prasath ◽  
S. Mangaleswaran ◽  
M. Manikanda Raja ◽  
R. Jegan
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Natural Fiber ◽  
Tensile Load ◽  
Flax Fiber ◽  
Flexural Properties ◽  
Weight Percentage ◽  
Tensile Impact ◽  
Polyester Composite ◽  
Additional Support

: The objective of this research is to evaluate the tensile, impact and flexural properties of flax fiber and basalt powder filled polyester composite. Flax fiber is one of the predominant reinforcement natural fiber which possess good mechanical properties and addition of basalt powder as a filler provides additional support to the composite. The Composites are prepared using flax fiber arranged in 10 layers with varying weight percentage of the basalt powder as 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.% and 30 wt.% respectively. From the results it is inferred that the composite combination 10 Layers of flax / 5 wt.%, basalt Powder absorbs more tensile load of 145 MPa. Also, for the same combination maximum flexural strength is about 60 MPa. Interestingly in the case of impact strength more energy was absorbed by 10 layers of flax and 30 wt.% of basalt powder. In addition, the failure mechanism of the composites also discussed briefly using SEM studies.

scholarly journals Effect of Water Flow on Underwater Wet Welded A36 Steel

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 682
Author(s):  
Eko Surojo ◽  
Aziz Harya Gumilang ◽  
Triyono Triyono ◽  
Aditya Rio Prabowo ◽  
Eko Prasetya Budiana ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Flow ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Physical And Mechanical Properties ◽  
Shielded Metal Arc Welding ◽  
Effect Of Water ◽  
Bending Effect ◽  
Metal Arc Welding ◽  
A36 Steel

Underwater wet welding (UWW) combined with the shielded metal arc welding (SMAW) method has proven to be an effective way of permanently joining metals that can be performed in water. This research was conducted to determine the effect of water flow rate on the physical and mechanical properties (tensile, hardness, toughness, and bending effect) of underwater welded bead on A36 steel plate. The control variables used were a welding speed of 4 mm/s, a current of 120 A, electrode E7018 with a diameter of 4 mm, and freshwater. The results show that variations in water flow affected defects, microstructure, and mechanical properties of underwater welds. These defects include spatter, porosity, and undercut, which occur in all underwater welding results. The presence of flow and an increased flow rate causes differences in the microstructure, increased porosity on the weld metal, and undercut on the UWW specimen. An increase in water flow rate causes the acicular ferrite microstructure to appear greater, and the heat-affected zone (HAZ) will form finer grains. The best mechanical properties are achieved by welding with the highest flow rate, with a tensile strength of 534.1 MPa, 3.6% elongation, a Vickers microhardness in the HAZ area of 424 HV, and an impact strength of 1.47 J/mm2.

Sign in / Sign up

Export Citation Format

Share Document