Effect of the Amount of Water Medium on Short-Cut Rice Straw Based Composite

2014 ◽  
Vol 525 ◽  
pp. 166-169 ◽  
Author(s):  
Chuan Bao Wu ◽  
Yang Bo
Keyword(s):  
Tensile Strength ◽  
Rice Straw ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Water Medium ◽  
Pressing Method ◽  
Elongation At Break ◽  
Preparation Conditions ◽  
Fluctuation Range ◽  
Strength Difference

A series of such composites of poly (vinyl alcohol) and short-cut rice straw were prepared by hot-pressing method at different water medium amounts. And the effects of medium amount on the strength, elongation and hardness of composites were studied. Results indicate tensile strength of composite prepared with 5 mL medium is 119% higher than that with 10 mL medium at formula of 18 g rice straw and 12 g poly (vinyl alcohol). And this kind of strength difference is 98% higher at formula of 15 g rice straw and 15 g poly (vinyl alcohol). Elongation at break is 17.85% when 5 mL medium, 12 g poly (vinyl alcohol) and 18 g short-cut rice straw were used. However, it reaches 21.46% when 10 mL medium was used. The hardness fluctuation range shows no difference when preparation conditions were changed. But samples prepared with 5 mL medium roughly show higher hardness than that prepared with 10 mL medium.

Preparation and Performance of CGFS Reinforced PVA/RSP Composite

2014 ◽  
Vol 968 ◽  
pp. 84-87
Author(s):  
Chuan Bao Wu ◽  
Xian Zhi Li
Keyword(s):  
Tensile Strength ◽  
Rice Straw ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Mass Ratio ◽  
Pressing Method ◽  
Reinforcing Effect ◽  
And Performance ◽  
Main Material

Application of chopped glass fiber strand (CGFS) in rice straw based composite was studied and the reinforcing effect of CGFS was evaluated. Rice straw powder (RSP) was used as main material and poly (vinyl alcohol) (PVA) was selected as adhesive agent. Composites were prepared by hot-pressing method at 10 MPa pressure, 140 °C for 10 min, with the mass ratio of RSP to PVA of 4:3. Results showed that the tensile strength of the composites first increased and then decreased with increasing CGFS amount. When the mass ratio of CGFS to RSP was 7:15, the composite reached its maximum strength of 20.47 MPa. CGFS showed obvious reinforcing effect. Strength at tensile break showed similar change law and tensile strength equaled to or was slightly higher than the strength at tensile break. The tensile elongations of all composites with CGFS were higher than 20%, proving the toughening role of CGFS. The hardness of composites showed certain non-uniformity and lay between 87 and 96. Negligible difference existed in every composite.

WP Enhanced PVA/LRSS Composite

2014 ◽  
Vol 1015 ◽  
pp. 291-294
Author(s):  
Chuan Bao Wu
Keyword(s):  
Tensile Strength ◽  
Rice Straw ◽  
Hot Pressing ◽  
Vinyl Alcohol ◽  
Tensile Force ◽  
Poly Vinyl Alcohol ◽  
Strength Increase ◽  
Main Constituent ◽  
Pressing Method ◽  
Tensile Strength Increase

Composites with the chopped segments of lower part of rice straw (LRSS) as main constituent, poly (vinyl alcohol) (PVA) as adhesive constituent and waste paper (WP) as enhancing constituent were prepared by hot-pressing method. WP showed good enhancing role and certain toughening effect. WP made tensile strength increase by 86% and strength at tensile break by 69%; when composites were prepared at 40% PVA content, 140°C for 10 min. The tensile stretch and stretch at maximum tensile force of WP enhanced composite were respectively 16.5% and 14.3%, while those were respectively 12.3% and 11.9% without WP. The tensile strength of the composites increased with increasing PVA content. From 20% PVA content to 50% PVA content, tensile strength increased by 42.8%. When PVA content was 50%, the composite reached its maximum strength of 8.71 MPa. The hardness of composites lay between 91 and 97.

URSS/PVA/WP Composite Materials: Preparation and Performance

2014 ◽  
Vol 968 ◽  
pp. 80-83
Author(s):  
Chuan Bao Wu ◽  
Bo Qiao
Keyword(s):  
Tensile Strength ◽  
Composite Materials ◽  
Rice Straw ◽  
Hot Pressing ◽  
Vinyl Alcohol ◽  
Tensile Elongation ◽  
Environmentally Friendly ◽  
Waste Paper ◽  
Poly Vinyl Alcohol ◽  
And Performance

A novel kind of environmentally friendly composite materials containing upper part of rice straw segments (URSS), poly (vinyl alcohol) (PVA) and waste paper (WP) were prepared by hot-pressing at 140°C for 10 min. The tensile strength, tensile elongation and hardness of composites were measured. Results showed that the tensile strength and the strength at tensile break of the composites first increased and then decreased with increasing PVA content. Tensile strength was higher than the strength at tensile break at different PVA contents, indicating that URSS/PVA/WP composite materials had certain toughness. Otherwise, URSS/PVA/WP composite materials had higher tensile strength than URSS/PVA composites. The tensile strengths of them were respectively 9.25 MPa and 3.9 MPa when prepared at PVA content of 40%. The hardness of composites lay between 90 and 96. Negligible difference exists in every composite.

Study on Season Factor in the Preparation of PVA/RS Composite

2014 ◽  
Vol 881-883 ◽  
pp. 1171-1174
Author(s):  
Chuan Bao Wu
Keyword(s):  
Tensile Strength ◽  
Rice Straw ◽  
Hot Pressing ◽  
Vinyl Alcohol ◽  
Tensile Fracture ◽  
Poly Vinyl Alcohol ◽  
Comparison Results ◽  
Winter Sample ◽  
Summer Sample

The effect of season factor on the performances of poly (vinyl alcohol)/rice straw (PVA/RS) composites prepared by hot-pressing was studied. Two forms of RS, including shortcut RS and RS wires, were used to prepare composite. For PVA/ shortcut RS composites, samples of winter showed higher tensile strength and strength at tensile fracture at different PVA contents than that of summer. When PVA content is 50%, tensile strength of winter sample is 136% higher than that of summer sample and strength at tensile fracture of winter sample is 320% higher than that of summer sample. In addition, samples of winter showed lower tensile stretch and higher hardness at different PVA contents than that of summer. For PVA/RS wire composites, the comparison results are similar. These indicated that season is an important factor for preparing plant based composite with PVA as adhesive.

Preparation and Properties of Biocomposite Film with Gelatin and Poly(Vinyl Alcohol)

2011 ◽  
Vol 287-290 ◽  
pp. 302-305
Author(s):  
Xi Ping Gao ◽  
Ke Yong Tang ◽  
Yu Qing Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Optical Properties ◽  
Vinyl Alcohol ◽  
Composite Films ◽  
Poly Vinyl Alcohol ◽  
Elongation At Break ◽  
Biocomposite Film

The mechanical properties, swelling, solubility, and optical properties of composite films with poly(vinyl alcohol) (PVA) and gelatin were studied. With increasing the PVA content in the composite films, the tensile strength (TS) and elongation at break (EB) of the films increase. The swelling and solubility are different with different gelatin/PVA ratios, with the lowest at 1:5.

scholarly journals FTIR spectroscopy characterization and critical comparison of poly(vinyl)alcohol and natural hydroxyapatite derived from fish bone composite for bone-scaffold

2021 ◽  
Vol 2120 (1) ◽  
pp. 012004
Author(s):  
May Teng Hooi ◽  
Siew Wei Phang ◽  
Hui Ying Yow ◽  
Edmund David ◽  
Ning Xin Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Vinyl Alcohol ◽  
Fish Bone ◽  
Poly Vinyl Alcohol ◽  
Solution Casting ◽  
Casting Method ◽  
Elongation At Break ◽  
Solution Casting Method ◽  
Extrusion Method

Abstract This paper presents the interaction comparison of poly(vinyl) alcohol (PVA) with hydroxyapatite derived from Spanish Mackerel (SM) and Whitefin Wolf Herring (WWH) bones, in different processing method. PVA filament and solution casting method illustrated higher crystallinity in the FTIR graph as compared to the PVA pellet and filament extrusion method. Besides, minimal interactions between PVA with glycerol and HAp was observed as well. PVA pellet and solution casting method portrait higher interaction as compared to the PVA filament and extrusion method. As for the HAp of SM and WWH, WWH had higher crystallinity and better cell adhesion with a higher Ca/P ratio while SM had relatively better mechanical strength with Ca/P ratio near to stoichiometric value. The loading of HAp (0, 2.5, 5, 10, 20, 30%) does not affect interactions of PVA/HAp composite in FTIR, and thermal properties in TGA. However, it caused an increase in crystallinity at low HAp loading and decreased at higher loading of HAp above 10%. Upon addition of HAp, tensile strength increased and elongation at break decreased. As the loading of HAp increased, both mechanical properties decreased. Scaffold with WWH composite possessed lower tensile strength and higher elongation at break than SM composite. The result of mechanical properties corresponded to the SEM result. ANOVA analysis justified the effect of HAp variations and loading on the mechanical properties of the composite was prominent.

scholarly journals Research on the Tensile Properties of Packaging Film Based on Environmental Protection PVA-KGM

2021 ◽  
Author(s):  
Ligui Xiong ◽  
Liqiong Zhang
Keyword(s):  
Tensile Strength ◽  
Environmental Protection ◽  
Tensile Properties ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Homogeneous State ◽  
Elongation At Break ◽  
Packaging Films ◽  
Polyelectrolyte Solution ◽  
Diffusion Precipitation

Konjac glucomannan (KGM) and poly (vinyl alcohol) (PVA) were mixed to form gel-like polyelectrolyte solution with glycerol and sorbitol as compound plasticizer, which was used to prepare packaging films via casting and drying. The results show that the tensile strength and elongation at break of the packaging films drop sharply when the blending temperature and blending time exceed 80 °C and 3.5 h. When the mass ratio of sorbitol and glycerol in the compound plasticizer ranges from 1:1 to 1:3, it is beneficial to improve the tensile strength of the packaging films. The microscopic reasons for the change of the tensile properties of the packaging films are mainly caused by diffusion-stop-continuing diffusion—precipitation of low-molecular electrolyte, which makes the system shift from equilibrium-homogeneous state- unbalanced state—heterogeneous state.

Preparation and Characterization of Chitosan/poly( Vinyl Alcohol) Composite Packaging Films

2011 ◽  
Vol 332-334 ◽  
pp. 1739-1742 ◽  
Author(s):  
Ling Li ◽  
Zheng Wei Jin ◽  
Jian Qing Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Water Vapor ◽  
Vinyl Alcohol ◽  
Permeability Coefficient ◽  
Composite Films ◽  
Weight Ratio ◽  
Poly Vinyl Alcohol ◽  
Elongation At Break ◽  
Packaging Films

A novel chitosan/poly(vinyl alcohol) composite packaging films were prepared by the casting method, and the effects of chitosan concentration on the structures, mechanical properties, permeability for oxygen and water vapor were discussed in this study. Mechanical properties of these films, which were evaluated by the tensile test and the barrier properties showed that the elongation at break (E) of the composite films decreased rapidly with the addition of chitosan, whereas, the tensile strength (TS) presented an almost opposite trend. Both the water vapour and oxygen transmission rate values were increased with the increasing amount of the chitosan in the composite films. Based on the obtained results, the better property of the composites films would be prepared chitosan/poly(vinyl alcohol) blends at a weight ratio of 3/5, and the tensile strength and elongation at break of the packaging films were 34.12 MPa, 40.24 % respectively. It was also observed that the water vapor permeability coefficient (Pv) and the oxygen permeability coefficient (P) of chitosan/poly(vinyl alcohol) composite packaging films prepared with weight ratio of 3/5 were 1.99×10-15 g•cm/cm2•s•Pa and 7.98×10-16 cm3•cm/cm2•s•Pa respectively. The composite films in this paper can be used in fresh-keeping or other fields as a kind of green packaging material.

Composite of Shortcut Grass and Poly(vinyl alcohol): Preparation and Performance

2014 ◽  
Vol 881-883 ◽  
pp. 1179-1182
Author(s):  
Chuan Bao Wu ◽  
Yu Jun Zhou
Keyword(s):  
Tensile Strength ◽  
Hot Pressing ◽  
Vinyl Alcohol ◽  
Raw Materials ◽  
Raw Material ◽  
Tensile Fracture ◽  
Poly Vinyl Alcohol ◽  
Pressing Temperature ◽  
Pressing Method ◽  
And Performance

The environmentally friendly composite of poly (vinyl alcohol) (PVA) and shortcut grass were prepared by hot-pressing method. First, dry grass was cut into 1.5 cm long segments. Then, shortcut grass was mixed with PVA by using water as medium. The mixed uniformly raw materials were hot-pressed at different temperatures for different times. The effects of raw material ratio, hot-pressing temperature and hot-pressing temperature on composites performance were studied. Results showed that composites tensile strength increases with the increase of PVA content. Tensile strength reaches 3.59 MPa at 50% of PVA content. The tensile fracture stretch increases with PVA content and reaches 25.28% when PVA content is 50%. The tensile strength first increases and then decreases with the increase of hot-pressing temperature and hot-pressing temperature. The hardness of composite is uneven. Hardness at 20% of PVA content is lower slightly than that at other PVA contents.

Trial-Preparation of RSS Based Composite Containing GF

2014 ◽  
Vol 1015 ◽  
pp. 82-85
Author(s):  
Chuan Bao Wu ◽  
Xiang Li Liu
Keyword(s):  
Tensile Strength ◽  
Glass Fiber ◽  
Rice Straw ◽  
Vinyl Alcohol ◽  
Maximum Strength ◽  
Poly Vinyl Alcohol ◽  
Mass Ratio

In order to explore the enhancing method of rice straw based composites, glass fiber (GF) was introduced into the preparation of composites of poly (vinyl alcohol) (PVA) and rice straw slice (RSS). The tensile performances and hardness of composites were characterized. Results showed that GF had obvious enhancing role on PVA/RSS composites. The tensile strength of the composites first increased and then decreased with increasing GF amount. When the mass ratio of RSS, PVA and GF was 20:15:7, the composite reached its maximum strength of 23.45 MPa, which increased by 1.49 times compared to the composites without GF. The strength at tensile break of composites increased with the increase of GF amount. The maximum of strength at tensile break was 23.12 MPa when GF amount was 9 g. The stretch of composites first increased and then decreased with increasing GF amount. The addition of GF had no effect on the hardness of composites.

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