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A natural-based absorbent polymer based on potato protein: Functionalized via dry acylation with high scalability
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Most superabsorbent polymers (SAP) today are produced from oil, a nonrenewable resource, which contribute to the worlds environmental problems.

This study investigates if a dry functionalization route can increase water absorption capacity of protein concentrates, and potato protein concentrate (PPC) especially. In order to create a naturally based, biodegradable SAP trough a nontoxic process with high scalability for easy implementation at an industrial scale.

The PPC was functionalized through acylation, trying five acylation agents (AA, A-E) at three different temperatures (T1-T3). The samples where then characterized with Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and a standardized absorption test.

A naturally based, biodegradable SAP was created with an absorption capacity of 14 g/g (using AA A at temp T2). Four samples experienced an unexpected color shift believed to originate from Maillard and caramelization reactions as well as light scattering phenomena. These samples were also experiencing a previously undocumented solubility transformation likely originating from a highly efficient acylation process together with an insufficient amount of crosslinking. A phase separation was also found in these samples which needs further investigation.

This dry functionalization of protein concentrates is capable of producing biodegradable SAPs but does not compete with current materials. The functionalized samples need further characterization to accurately determine the feasibility of this protocol in order to provide environmentally friendly alternatives for the future. 

Abstract [sv]

Dagens suprabsorberande polymerer(SAP)är huvudsakligen oljebaserade,vilket är en icke förnybar råvara som bidrar till världens växande miljöproblem.

Studiens syfte är att undersökahuruvida en torrreaktionsprocess kan användas för att öka vattenabsorptionsförmågan för proteinkoncentrat, medsärskilt fokuspåpotatisproteinkoncentrat (PPC). Detta för att kunna tillverka en naturligt nedbrytbar SAP baserad på en förnybar råvara via en giftfritillverkningsprocess som lätt kan skalas upp till industriell nivå.

Som metod för att förändra egenskaperna hos PPChar acylering använts, där fem olika acyleringsreagens(AA, A-E)har testats vid tre olika reaktionstemperaturer(T1-T3).Produkterna har därefter karaktäriserats medFourier transform-infraröd spektroskopi (FTIR), termogravimetrisk analys (TGA), differentialskanningskalorimetri (DSC), avsökningselektronmikroskopi (SEM) samt ett standardiserat absorptionstest.

En naturligt nedbrytbar SAP tillverkades med en absorptionskapacitet av 14g/g (via AA: A,vid temperatur: T2)Fyra prover uppvisade ett oväntatfärgskifte, vilket föreslås bero på Maillard-och karamelliseringsreaktioner samt ljusbrytningsfenomen relaterat till partikelstorlek. Även en tidigare odokumenterad återgång från aggregerat tillstånd till full löslighet observerades. Dessa två fenomen har dessutom korrelerats med en observerad fasseparationvars ursprung måste undersökas vidare.

Den valdareaktionsprocessenlyckadesproducera en bionedbrytbar SAP, dock inte i paritet med befintligamaterial. De produceradeproverna behöver undersökas vidare för att möjliggöraen slutgiltig bedömning av hur lovande denna tillverkningsprocess är för att skapamiljövänliga SAPs.

Place, publisher, year, edition, pages
2018. , p. 38
Keywords [en]
protein, potato, superabsorbent, biodegradable, acylation, diaper, SAP
National Category
Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:kth:diva-231378OAI: oai:DiVA.org:kth-231378DiVA, id: diva2:1227866
Subject / course
Materials Design and Engineering
Educational program
Master of Science in Engineering - Materials Design and Engineering
Supervisors
Examiners
Available from: 2018-06-28 Created: 2018-06-27 Last updated: 2018-06-28Bibliographically approved

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