biopolymer-clay nanocomposites

NATURE OF COMPONENTS INTERACTION IN BIOPOLYMER – CLAY

NANOCOMPOSITES

Līva DZENE Bibliographical project

Ottawa, 5 November 2012

CHM8342 Clay Minerals Chemistry

Outline

Interest

Interaction

Biopolymers

Future perspective

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Why biopolymer-clay nanocomposites?

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Interest Interaction Biopolymers Future perspective

(McDonough&Braungart,2001) (Plastics – the Facts 2012)

Why biopolymer-clay interaction?

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Interest Interaction Biopolymers Future perspective

Type of interaction

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Interest Interaction Biopolymers Future perspective

• Melt processing

• Casting

• Water

• Organic solvents (polar, apolar)

• Montmorillonite

• Kaolinte

• Sepiolite

• Organoclay

• Cationic

• Anionic

• Non-ionic Charge

of polymer

Clay mineral

Prepara-tion

process Solvent

Type of interaction

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Interest Interaction Biopolymers Future perspective

(Theng, 2012)

Cation exchange process; Increase of ionic strenght will increase the adsorption

Association with cation through ion-dipole interaction; Interaction process determined by surface accessibility

H-bond with edges at low pH Complexation with polyvalent cations

Biopolymers used for nanocomposite preparation

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Interest Interaction Biopolymers Future perspective

Proteins

Corn zein

Wheat gluten

Gelatin

Soy protein

Whey protein

Silk fibroin

Polysaccharides

Starch

Cellulose

Chitosan

Bacterial polymers

PLA

PHAs

(Vroman&Tighzert, 2009)

Protein-clay nanocomposites

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Interest Interaction Biopolymers Future perspective

Biomaterials Controlled drug delivery

SF-MMT nanocomposites in acid and nearly neutral media (Dang et al., 2010)

Polysaccharide-clay nanocomposites

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Interest Interaction Biopolymers Future perspective

Food packaging «Smart» materials

(Darder et al., 2003) (An & Dultz, 2007

(Zhang, X. et al., 2010) (Chivrac et al., 2010) (Zhang, Q.-X. et al., 2007)

Bacterial polymer – clay nanocomposites

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Interest Interaction Biopolymers Future perspective

Polylactic acid (PLA) Polyhydroxyalkanoates (PHAs): poly(3-hydroxybutyrate) PHB → R=CH3

Poly(3-hydroxyvalerate) PHV → R=C2H5

(Okamoto, 2012) (Plackett, 2012)

Botana et al. (2010). Effect of modified montmorillonite on biodegradable PHB nanocomposites. Applied Clay Science, 47(3-4), 263–270.

Food packiging ???

Future perspectives

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Interest Interaction Biopolymers Future perspective

More clay minerals….

More biopolymers…

More applications…

Surface studies…

Conclusion

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Interest Interaction Biopolymers Future perspective

Place in sustainable development, yet economical and

technical issues to overcome

Merging knowledge from different research domains

can enhance general understanding

Electrostatic, H-bond, van der Waals interactions

Importance of raw materials and processing conditions

Thank you for your attention! ---

Merci pour votre attention!

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