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Enhancement of the wet properties of transparent chitosan-acetic-acid-salt films using microfibrillated cellulose
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
STFI-Packforsk.
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2007 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 8, no 8, 2398-2403 p.Article in journal (Refereed) Published
Abstract [en]

This report presents a new route to enhance the wet properties of chitosan-acetic-acid-salt films using microfibrillated cellulose (MFC). The enhancement makes it easier to form chitosan-acetic-acid-salt films into various shapes at room temperature in the wet state. Chitosan with MFC was compared with the well-known buffer treatment. It was observed that films containing 5 wt % MFC were visually identical to the buffered/unbuffered films without MFC. Field-emission scanning electron microscopy indicated that MFC formed a network with uniformly distributed fibrils and fibril bundles in the chitosan matrix. The addition of MFC reduced the risk of creases and deformation in the wet state because of a greater wet stiffness. The wet films containing MFC were also extensible. Although the stiffness, strength and extensibility were highest for the buffered films, the wet strength of the MFC-containing unbuffered films was sufficient for wet forming operations. The effects of MFC on the mechanical properties of the dry chitosan films were small or absent. It was concluded that the addition of MFC is an acceptable alternative to buffering for shaping chitosan films/products in the wet state. The advantages are that the "extra" processing step associated with buffering is unnecessary and that the film matrix remains more water-soluble.

Place, publisher, year, edition, pages
2007. Vol. 8, no 8, 2398-2403 p.
Keyword [en]
Acetic acid, Mechanical properties, Scanning electron microscopy, Solubility, Stiffness, Wetting Buffer treatment, Chitosan-acetic-acid-salt films, Film matrix, Microfibrillated cellulose
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-8363DOI: 10.1021/bm070246xISI: 000248755000010Scopus ID: 2-s2.0-34548207331OAI: oai:DiVA.org:kth-8363DiVA: diva2:13665
Note
QC 20100831Available from: 2008-05-07 Created: 2008-05-07 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Biodegradable Blends and Nanocomposite Films with Amylopectin, Poly(lactic acid) and Chitosan Matrices
Open this publication in new window or tab >>Biodegradable Blends and Nanocomposite Films with Amylopectin, Poly(lactic acid) and Chitosan Matrices
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [sv]

Användningan av engångsförpackningar har ökat kraftigt de senaste åren. Den absolut största delen av dessa förpackningar tillverkars av oljebaserade plaster såsom polyetylen (PE) och polypropylen (PP). Dessa har även en oerhört lång nedbrytningstid, vilket gör det viktigt att finna mer miljövänliga alternativ. Exempel på förnyelsebara och bionedbrytbara material är amylopektin (AP), kitosan och polymjölksyra (PLA). I denna avhandling presenteras arbete med att utveckla dessa material för att öka deras chanser att i framtiden användas som, förslagsvis, förpackningsmaterial. Nanokompositer baserade på AP och kitosan tillverkas genom att montmorillonitlera (MMT) och/eller mikrofibrillär cellulosa (MFC) inkorporeras i matrisen. En metod där en vattenlöslig reaktiv kompatibilisator används för att öka adhesionen mellan MMT och AP-matrisen presenteras. Mekanisk prövning visar på ökad styvhet and styrka när kompatibilisatorn används. Påverkan av olika värmebehandlingar innan, under och efter filmbildning redovisas. Med infraröd strålning (IR) och absorbtionsmätningar följs rektionen mellan fyllmedel och matris. Studier på MFC/AP visar att användningen av MFC leder till en anmärkningsvärd effect, det vanligen spröda amylopektinmaterialet blir en böjbar komposit utan att använda mjukgörare. Detta är möjligt tack vare att MFC är mycket hydroskopisk och, som de termiska mätningarna visar, binder vatten väldigt hart. Även mekaniska prövning av fiberkompositerna har studerats. Fiberkompositer baserade på kitosan har studerats tillsammans med en allmänt vedertagen buffringsmetod. De mekaniska egenskaperna i vått och torrt tillstånd har genom detta kunna förbättrats. Fiber och lerdistributionen i samtliga nanokompositer har även analyserats med X-ray, transmissions electron mikroskop (TEM), skanning electron mikroskop (SEM) och optiskt mikroskop (OM). Slutligen har PLA blandningar med AP producerats genom smältblandning. För att öka affiniteten mellan de två komponenterna har en nedbrytbar sort av polyetylenvinylalkohol (EVOH), med hög halt vinyl alkohol, använts som kompatibilisator. Den morphologiska stukturen har studerats genom SEM, OM, och Raman spektroskopi. En bra mixing erhölls även om en visss fasseparation kunde ses. När även glycerol ingick i systemet kunde en lite bättre dispersion fås.

Abstract [en]

As the use of disposable materials is rapidly increasing so are the issues with waste handling. Today, the majority of the materials used for these applications, i.e. food packages, are oil-based plastics such as polyethylene and polypropylene. Therefore, it is important to find biodegradable materials made from renewable resources for this huge growing market. Amylopectin (AP), poly(lactic acid) (PLA) and chitosan are three interesting materials for these applications. In this thesis, several ways and methods are evaluated to improve these materials and their chances of becoming future biodegradable bulk materials. AP and chitosan based nanocomposites were created by incorporating montmorillonite (MMT) and/or microfibrillated cellulose (MFC) into the materials. Also, a novel approach of using a water-soluble coupling agent to enhance the strength and stiffness of AP/MMT-composites by increasing the adhesion between the matrix and the filler is presented. Through infrared spectroscopy (IR) and moisture absorption measurements the reaction was analyzed. Mechanical testing showed that an improved strength and stiffness was obtained with the use of the coupling agent. By using appropriate treatment, before, during and after filmmaking, the effect of the coupling agent could be further increased. The AP/MFC composites showed that MFC bind water very tightly, creating a foldable material based on the naturally brittle AP. Chitosan has been investigated to study the mechanical properties of films in dry and wet conditions using MFC and/or a well-known buffer treatment. The addition of MFC prevented extensive shrinkage in the wet condition due to increased wet stiffness. The fibre and clay distribution in all the composites have been analyzed with X-ray, transmission electron microscopy, scanning electron microscopy and optical microscopy. Furthermore, PLA/AP blends were produced through melt mixing. In efforts to improve the affinity between the two constituents, a biodegradable grade of poly(ethylene-co-vinyl alcohol) EVOH, with high vinyl alcohol content, was used as a compatibilizer. Good mixing were obtained even if some phase separated structure could be seen. The presence of glycerol slightly increased the dispersion of the secondary phase in PLA.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 61 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:29
Keyword
amylopectin, chitosan, microfibrillated cellulose, nanocomposite, montmorillonite, coupling agent, amylopektin, kitosan, mikrofibrillär cellulose, nanokomposit, montmorillonit, kompatibilisator
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-4731 (URN)978-91-7178-939-6 (ISBN)
Public defence
2008-05-30, F3, Lindstedtsvägen 26, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
QC 20100831Available from: 2008-05-07 Created: 2008-05-07 Last updated: 2010-08-31Bibliographically approved
2. Biodegradable nanocomposite films based on amylopectin and chitosan
Open this publication in new window or tab >>Biodegradable nanocomposite films based on amylopectin and chitosan
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

The use of disposable material is rapidly increasing, today the absolute majority of the material used for these application, i.e. food packages, are oil-based plastics such as polyethylene and polypropylene. Therefore it is of great importance to find alternative biodegradable materials made from renewable resources for this huge growing market. In the present thesis, work and research to develop and improve such materials are presented. Amylopectin and chiotsan are two interesting material choises for these applications. In this thesis serveral ways of improving amylopectin (AP) and chitosan films are presented, using either Na+-montmorillonite (MMT) or microfibrillated cellulose (MFC). A novel approach of using a water-soluble coupling agent to enchance the strength and stiffness of MMT/AP-composites by increasing the adhesion beween the matrix and the filler. The results from IR, mechanical and moisture absorption tests show that the coupling agent indeed improve the properties of the composite films. Studies on MFC/AP show that the MFC have a remarkable effect of acting as a reinforcing plasticiser creating a flexible material without the use of a plasticiser. Thermal measurements show that the MFC have a ability to bound water very tightly. This was further investigated with thermal analysis. Chitosan, another interesting “green material”, and the effect of using MFC and/or a well-known buffer treatment, to enhace the mechanical properties of chitosan films in dry and wet conditions have here been investigated. The addition of MFC prevented extensive shrinkage in the wet condition due to increased wet stiffness.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 41 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2006:36
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-4168 (URN)91-7178-477-2 (ISBN)
Presentation
2006-11-22, V3, Väg&Vatten, Teknikringen 72, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20101122Available from: 2006-11-13 Created: 2006-11-13 Last updated: 2010-11-22Bibliographically approved

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