Graft copolymerization of acrylic acid onto hydrolyzed potato starch using various initiators

The aim of this study was to investigate the changes in properties of yarn made by sizing with synthetic and natural modified corn starch. Different procedures for obtaining modified natural (corn) starch and various combinations of natural and synthetic sizes were used to explore the differences in the properties of sized yarn. The sizing process was carried out wunderith constant conditions in a newly developed laboratory sizing machine on twisted cotton yarns of 20×2 tex and 30×2 tex. According to the results obtained, yarn sized with synthetic sizes has substantially better properties than those which are naturally sized with modified starch. However, sometimes these differences are not significant or they do not exist at all. Twisted yarn is not always necessary in sizing in order to increased its strength but rather to protect the surface from wear and refine projecting fibers; in this case natural modified starch from corn can meet the requirements. The significance of this research is the application of natural sizes, improvement of the sizing process with natural modified sizes using new achievements in the development of the sizing process, and thus creating a positive environmental and economic impact.

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“…In the end, washing and drying processes follow at 60 °C. The hydrolysis yield [9] of the hydrolysed starch was 76%.…”

Section: Grafting-copolymerization Processmentioning

confidence: 94%

Natural Modified Starch and Synthetic Sizes in Function of Characteristics of Sized Yarn

Kovačević¹,

Đorđević²,

Djordjević³

2016

F&TinEE

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“…Grafting efficiency is limited with persulfate initiation relative to other more selective methods due to the favourability of homopolymerization of the synthetic monomer over radical formation on the starch anhydroglucose repeat unit. Graft polymerizations of acrylic acid onto hydrolysed starch in solution produced higher PG and GE than identical reactions with AIBN and benzoyl peroxide, presumably due to lower overall reaction rate and thus less homopolymerization [122]. An induction time for grafting was generally observed in grafting polymerizations with KPS, while overall conversion induction time increased Graft polymerizations of acrylic acid onto hydrolysed starch in solution produced higher PG and GE than identical reactions with AIBN and benzoyl peroxide, presumably due to lower overall reaction rate and thus less homopolymerization [122].…”

Section: Persulfatesmentioning

confidence: 99%

“…Graft polymerizations of acrylic acid onto hydrolysed starch in solution produced higher PG and GE than identical reactions with AIBN and benzoyl peroxide, presumably due to lower overall reaction rate and thus less homopolymerization [122]. An induction time for grafting was generally observed in grafting polymerizations with KPS, while overall conversion induction time increased Graft polymerizations of acrylic acid onto hydrolysed starch in solution produced higher PG and GE than identical reactions with AIBN and benzoyl peroxide, presumably due to lower overall reaction rate and thus less homopolymerization [122]. An induction time for grafting was generally observed in grafting polymerizations with KPS, while overall conversion induction time increased with higher starch content.…”

Section: Persulfatesmentioning

confidence: 99%

“…Azobisisobutyronitrile (AIBN) is a hydrophobic initiator that dissociates into two 2-cyanoprop-2-yl radicals capable of initiating polymerization of vinyl monomers (Figure 16). These radicals are capable of abstracting hydrogen from a hydroxyl group on the anhydroglucose units, thus creating a radical on the starch backbone [11,15,122,141,192]. AN was grafted more readily to native starch granules than MMA due to its increased hydrophilicity [138].…”

Section: Aibnmentioning

confidence: 99%

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On the Use of Starch in Emulsion Polymerizations

et al. 2019

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The substitution of petroleum-based synthetic polymers in latex formulations with sustainable and/or bio-based sources has increasingly been a focus of both academic and industrial research. Emulsion polymerization already provides a more sustainable way to produce polymers for coatings and adhesives, because it is a water-based process. It can be made even more attractive as a green alternative with the addition of starch, a renewable material that has proven to be extremely useful as a filler, stabilizer, property modifier and macromer. This work provides a critical review of attempts to modify and incorporate various types of starch in emulsion polymerizations. This review focusses on the method of initiation, grafting mechanisms, starch feeding strategies and the characterization methods. It provides a needed guide for those looking to modify starch in an emulsion polymerization to achieve a target grafting performance or to incorporate starch in latex formulations for the replacement of synthetic polymers.

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“…The radical formation occurs by thermal decomposition of the initiator. For example it can be used successfully for grafting poly(acrylic acid) on hydrolysed starch (GE = 51%, M w = 2.07 × 10 6 g/mol) , poly(methyl methacrylate) , and polymethacrylamide on starch, respectively, at 80°C (GP = 5–95%) and 65–95°C (GP = 0–70%). Starch‐ graft ‐polystyrene was also formed by steaming process using water as a blowing agent .…”

Section: Grafting From Via Radical Polymerizationmentioning

confidence: 99%

Modification of starch by graft copolymerization

et al. 2017

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Research toward bio-based and biodegradable polymers has received a lot of attention these last years, due to environmental concerns and the need to replace fossil resources. Starch is in this frame an interesting starting material due to its abundance and low cost. Native starch displays however, poor mechanical properties and is highly hydrophilic. New starch-based thermoplastic materials can be prepared to overcome these drawbacks by chemical modification, and notably graft copolymerization. A large range of polymers can be grafted on starch by ring-opening and radical polymerizations of various monomers in order to modulate the properties of the final product. Polymers can also be directly grafted onto starch using coupling strategies. This review presents the state of the art in the field.

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Graft copolymerization of acrylic acid onto hydrolyzed potato starch using various initiators

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Cited by 23 publications

References 24 publications

Natural Modified Starch and Synthetic Sizes in Function of Characteristics of Sized Yarn

Natural Modified Starch and Synthetic Sizes in Function of Characteristics of Sized Yarn

On the Use of Starch in Emulsion Polymerizations

Modification of starch by graft copolymerization

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