Journal ArticleDOI
Optimization of synthesis and characterization of cassava starch-graft-poly(acrylonitrile) using response surface methodology
TLDR
Graft copolymerization of poly(acrylonitrile) onto cassava starch was carried out with potassium persulphate (PPS) as the free radical initiator using a response surface Box-Behnken design as discussed by the authors.Abstract:
Graft copolymerization of poly(acrylonitrile) onto cassava starch was carried out with potassium persulphate (PPS) as the free radical initiator using a response surface Box–Behnken design. Different levels of monomer concentration, initiator concentration, and temperature were used, and regression models were generated in terms of these factors, which can be used to predict the grafting level and efficiency at a given level of the factors. The grafted starches were characterized by FTIR, XRD, and SEM analyses and determination of %grafting (%G), N-content, thermal properties, water and saline solution retention, and rheological properties. Under the conditions used, %G was found to depend only on the temperature used for the reaction. The maximum %G of 120.1 was obtained for the sample synthesized under the following conditions: weight of AN = 0.753 mol/10 g starch, weight of PPS = 0.284 g and temperature = 55°C, and the grafting efficiency was 30.03%. The absorption bands at 2243 cm−1 for the nitrile group (CN) in the FTIR spectra of the products confirmed the grafting reaction. There was a decrease in crystallinity and disappearance of the granular structure after grafting of the starch. The melting temperatures of the graft copolymers determined by differential scanning calorimetry analysis were higher than that of the native starch. The grafted starches exhibited very high thermal stability as observed from the thermogravimetric analysis. The superabsorbent polymer prepared from the grafted starch by alkali saponification exhibited a maximum water absorbency of 636 g/g. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011read more
Citations
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Journal ArticleDOI
Recent progress in chemical modification of starch and its applications
Qing Chen,Haojie Yu,Li Wang,Zain ul Abdin,Yongsheng Chen,Junhua Wang,Weidong Zhou,Xianpeng Yang,Rizwan Ullah Khan,Hongtao Zhang,Chen Xiao +10 more
TL;DR: This review focuses on the ways of chemical modification of starch including cross-linking, grafting, esterification, etherification, dual modification and so on, and presents the applications of the modified starch in fields like drug delivery, tissue engineering and heavy metal and dye removal.
Journal ArticleDOI
Cassava starch‐graft‐poly(acrylonitrile)‐coated urea fertilizer with sustained release and water retention properties
Journal ArticleDOI
Rheological and thermal properties of saponified cassava starch‐g‐poly(acrylamide) superabsorbent polymers varying in grafting parameters and absorbency
TL;DR: In this paper, cassava starch-graft-poly(acrylamide) superabsorbent polymers (SAPs) with varying absorbencies were synthesized and the storage and loss modulus of hydrogels were determined as a function of frequency.
Journal ArticleDOI
Fabrication and characterization of a multi-functional and environmentally-friendly starch/organo-bentonite composite liquid dust suppressant
TL;DR: In this paper, a starch/organo-bentonite composite liquid dust suppressant (CLDS) was successfully prepared to control road dust pollution, and the results suggested CLDS presented a porous three-dimensional network structure with numerous layers and folds, and residual CLDS could form a protective solidified layer together with dust via high viscosity after solidification.
Journal ArticleDOI
Graft copolymerization of polyDADMAC to cassava starch: Evaluation of process variables via central composite design
TL;DR: In this paper, the authors used the response surface methodology (RSM) comprising a three-level and four-variable central composite designs for variable evaluation and optimization of polydiallyldimethylammonium chloride (polyDADMAC) to cassava starch.
References
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Journal ArticleDOI
Synthesis and property characterization of cassava starch grafted poly[acrylamide-co-(maleic acid)] superabsorbent via γ-irradiation
TL;DR: In this article, a charge transfer mechanism for graft copolymerization of maleic acid and acrylamide onto cassava starch was described, and the water absorption of these saponified graft copolerant copolymers in saline and buffer solutions was also measured.
Journal ArticleDOI
Radiation modification of water absorption of cassava starch by acrylic acid/acrylamide
TL;DR: Graft copolymerizations of acrylamide and/or acrylic acid onto cassava starch by a simultaneous irradiation technique using gamma-rays as the initiator were studied with regard to various parameters of importance as discussed by the authors.
Journal ArticleDOI
Microwave assisted synthesis of Guar-g-polyacrylamide
TL;DR: In this article, the effect of MW power and exposure time on the grafting yields, both in presence and in absence of redox initiator and catalyst, were studied and a representative MW grafted copolymer was characterized using IR, 1H NMR, XRD and TGA.
Journal ArticleDOI
Microwave-accelerated synthesis and characterization of potato starch-g-poly(acrylamide)
TL;DR: Using a very low concentration of potassium persulfate as initiator, acrylamide could be efficiently grafted onto potato starch under microwave irradiation and for the grafting O 2 removal from the reaction vessel was not required.
Journal ArticleDOI
Preparation and characterization of thermoplastic starch/zein blends
Elisângela Corradini,Antonio J. F. Carvalho,Antônio Aprígio da Silva Curvelo,José Augusto Marcondes Agnelli,Luiz H. C. Mattoso +4 more
TL;DR: The use of zein in thermoplastic starch compositions causes a decrease in the water sensitivity of these materials and lower its melt viscosity during processing making zein a suitable and very promising component in TPS compositions as mentioned in this paper.
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