Radiation modification of water absorption of cassava starch by acrylic acid/acrylamide

2000 ◽  
Vol 59 (4) ◽  
pp. 413-427 ◽  
Author(s):  
Suda Kiatkamjornwong ◽  
Wararuk Chomsaksakul ◽  
Manit Sonsuk
Keyword(s):  
Acrylic Acid ◽  
Water Absorption ◽  
Cassava Starch ◽  
Radiation Modification

scholarly journals The Effect of Crosslinker and Pore Generated on Selective Adsorbent (Cu2+) based on Grafting of Acrylic Acid onto Cassava Starch

2015 ◽  
Vol 9 (7) ◽  
pp. 37
Author(s):  
Judy R. B. Witono ◽  
Henrietta Henrietta ◽  
Y. I. P Arry Miryanti
Keyword(s):  
Heavy Metal ◽  
Citric Acid ◽  
Acrylic Acid ◽  
Water Absorption ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Cassava Starch ◽  
Metal Adsorption ◽  
Acid Modification ◽  
Release Process

The technology development in many industries nowadays, such as electronic industry produces heavy metal wastes which may pollute our environment. The use of adsorbent as a heavy metal removal from soil and water is one of the efficient process which can be considered to be used. In addition the release of the adsorbate becomes an important way as well because usually those heavy metals still have a high value. The objective of this research is to develop adsorbent based on cassava starch. So, the release process will become easier and will not produce another waste. The adsorbent was produced through the grafting of acrylic acid onto cassava starch by using Fenton initiator. To construct a stable 3-D network, the crosslinker (CL) N,N’- methylenebisacrylamide was added. The variable observed were the amount of CL added (0.5%; 1.5%; 2.5% and 3.5%) and the treatment of generating more pores on starch copolymer. The treatments on starch copolymer observed were single freezing, second freezing, and citric acid modification and carbonization methods. Analysis performed on the adsorbent was % add-on, water absorption and metal adsorption (especially Cu2+ ion) capacity. The result showed that the used of 2.5% CL produced the highest add-on (47.66 %), the highest water absorption capacity and the highest metal adsorption capacity (0.29g Cu2+/g adsorbent) The citric acid modification also produced the highest pores on the adsorbent.

Dynamics of Water Absorption by the Copolymer of Dimethyldiallylammonium Chloride and Acrylic Acid

2021 ◽  
Vol 91 (3) ◽  
pp. 554-558
Author(s):  
I. M. Borisov ◽  
S. T. Rashidova ◽  
R. S. Luksha
Keyword(s):  
Acrylic Acid ◽  
Water Absorption

Structure and Properties of Chitosan Containing Polyacrylic Acid Hydrogel Grafted SMS Nonwovens

2009 ◽  
Vol 87-88 ◽  
pp. 513-517 ◽  
Author(s):  
Xu Pin Zhuang ◽  
Wen Jian Deng ◽  
Bo Wen Cheng
Keyword(s):  
Wound Healing ◽  
Antibacterial Activity ◽  
Acrylic Acid ◽  
Water Absorption ◽  
Ammonium Nitrate ◽  
Polyacrylic Acid ◽  
Structure And Properties ◽  
Second Stage ◽  
Xps Spectroscopy ◽  
Potassium Peroxydisulfate

Hydrogels donate moisture to dehydrated tissue and absorb some moisture and accepted in wound healing. Polypropylene (PP) SMS nonwovens were grafted polyacrylic acid (PAA) hydrogel technique contanining chitosan to enhance hydrophilicity and antibacterial activity. In the first stage, nonwovens were hydroxylated by treatment with aqueous potassium peroxydisulfate solution under a strong flow of nitrogen. In the second stage, the hydroxylated nonwovens were subjected to grafting of acrylic acid using cerric ammonium nitrate as an initiator. Subsequently, chitosan was grafted onto the modified NWs with N,N'-Methylenebisacrylamide. The modified nonwovens were characterized by XPS spectroscopy and SEM, the results showed that acrylic acid was copolymerized and hydrogel grafted onto SMS nonwovens. Hydrogel grafted nonwovens exhibited enhanced wettability and water absorption ability. With introduce of chitosan further, the modified NWs exhibited effectively antibacterial activity against E.coli.

scholarly journals Water absorption, retention and the swelling characteristics of cassava starch grafted with polyacrylic acid

2014 ◽  
Vol 103 ◽  
pp. 325-332 ◽  
Author(s):  
J.R. Witono ◽  
I.W. Noordergraaf ◽  
H.J. Heeres ◽  
L.P.B.M. Janssen
Keyword(s):  
Water Absorption ◽  
Polyacrylic Acid ◽  
Cassava Starch ◽  
Swelling Characteristics

scholarly journals Physico-mechanical and water absorption properties of LDPE/cassava starch film

2021 ◽  
Vol 4 (2) ◽  
pp. 103
Author(s):  
Junaidah Jai ◽  
Siti Fatma Abd Karim ◽  
Nurul Asyikin Md Zaki ◽  
Rabiatul Adawiyah Abdol Aziz ◽  
Farhana Wahet ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Water Absorption ◽  
Field Test ◽  
Cassava Starch ◽  
Plastic Waste ◽  
Absorption Properties ◽  
Commercial Plant ◽  
Control Film ◽  
Water Absorption Test ◽  
Degradable Plastic

Plastic waste is a global crisis, and Malaysia is the 8th worst country worldwide for plastic waste. With this trend, growing market demands for green product have imposed pressure on industries to find an alternative to petroleum-based plastic. Degradable plastic is introduced to overcome this limitation. The present work investigates degradable plastic film of low-density polyethylene incorporated with cassava starch (LDPE-CS). The compounding of the LDPE-CS was prepared via pre-mixing, blending, resin crushing, and film hot pressing. Film thickness, tensile strength, elongation, water absorption, and field test were conducted on the LDPE-CS and commercial LDPE (control). Experimental data of LDPE-CS and commercial LDPE films were evaluated and compared. Thickness of LDPE-CS film was 0.18 mm which was 51% thicker than the control film. Tensile strength and elongation of the LDPE-CS were 7.04 MPa and 5.39%, while control film was 12.77 MPa and 921.5%, respectively. The tensile strength and elongation of the LDPE-SC were significantly lower than the control film, which may be due to the weak interface between LDPE and starch. The water absorption test revealed that the LDPE-CS film absorbed water by 4.8%, which indicates its degradability in the water. The field test shows that the LDPE-CS is biodegradable and comparable with the commercial plant polybag in terms of its capability in planting. 

scholarly journals Desempenho germinativo de sementes de soja revestidas com polímeros hidrofílicos

2020 ◽  
Vol 16 (3) ◽  
pp. 48-59
Author(s):  
Marina Scarsi ◽  
Renata Paula Herrera Brandelero ◽  
Cristiane Deuner
Keyword(s):  
Water Absorption ◽  
Sodium Alginate ◽  
Seedling Emergence ◽  
Accelerated Aging ◽  
Biological Properties ◽  
Cassava Starch ◽  
Biocompatible Polymers ◽  
Soybean Seeds ◽  
Absorption Process ◽  
Physiological Quality

The use of biodegradable and biocompatible polymers in seeds coated has become important due to their desirable and renewable biological properties. The present study aimed to evaluate the effect of hydrophilic polymers on the water absorption process and physiological attributes of soybean seeds, NK 7059 RRcultivar. The seeds were coated with cassava starch, sodium alginate and polyvinyl alcohol biopolymers at four different concentrations 0, 2, 4 and 6%. The water absorption process was evaluated at three hour intervals for 24 hours, totaling eight evaluations. For physiological quality the seeds were submitted to the tests of first germination count, germination, germination speed index, accelerated aging, greenhouse emergence, emergence speed index and electrical conductivity. The polymers used in the present study increase the percentage of seed soaking, especially sodium alginate at a concentration of 4%. The increase in the concentration of polymers negatively affects seedling emergence, and in the case of sodium alginate it reduces germination and seeds vigor.

scholarly journals Physical characteristics of extruded cassava starch

2009 ◽  
Vol 66 (4) ◽  
pp. 486-493 ◽  
Author(s):  
Magali Leonel ◽  
Taila Santos de Freitas ◽  
Martha Maria Mischan
Keyword(s):  
Water Absorption ◽  
Specific Volume ◽  
Water Solubility ◽  
Cassava Starch ◽  
Physical Characteristics ◽  
Absorption Index ◽  
Starch Degradation ◽  
Screw Speed ◽  
Color Parameters ◽  
Paste Properties

Considering the importance of cassava starch for Brazilian industries, the current work aimed at evaluating the effects of extrusion parameters on the physical characteristics, mainly viscosity properties of extruded cassava starch. A factorial central composite design (2³) with three independent variables and the response surface methodology were used to evaluate the results of expansion index, specific volume, water absorption index, water solubility index, color and paste properties, according to the variations in the moisture content, barrel temperature and screw speed. Results indicated that barrel temperature influenced the expansion index, specific volume, water absorption index, all the color parameters, the initial viscosity, peak and final viscosity. Feed moisture influenced the specific volume, color parameters, final viscosity and retrogradation. The screw speed had effects on water absorption index, color components as well as on the final viscosity and retrogradation of extruded starch. High moisture, low screw speed and intermediate temperature provided lower starch degradation, which is desirable for pre-cooked starch.

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