Thermoplastic starch/wood composites

Interfacial interactions and functional properties

Péter Müller, Károly Renner, J. Móczó, E. Fekete, B. Pukánszky

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Thermoplastic starch (TPS)/wood composites were prepared from starch plasticized with 36 wt% glycerol. The components were homogenized by dry-blending, extruded and injection molded to tensile bars. Tensile properties, structure, deformation, water adsorption and shrinkage were determined as a function of wood content, which changed between 0 and 40 vol% in 7 steps. The modification of TPS with wood particles improves several properties considerably. Stiffness and strength increases, and the effect is stronger for fibers with larger aspect ratio. Wood fibers reinforce TPS considerably due to poor matrix properties and strong interfacial interactions, the latter resulting in the decreased mobility of starch molecules and in the fracture of large wood particles during deformation. Strong interfacial adhesion leads to smaller water absorption than predicted from additivity, but water uptake remains relatively large even in the presence of wood particles. The shrinkage of injection molded TPS parts is very large, around 10%, and dimensional changes occur on a very long timescale of several hundred hours. Shrinkage decreases to a low level already at 15-20 vol% wood content rendering the composites good dimensional stability.

Original languageEnglish
Pages (from-to)821-829
Number of pages9
JournalCarbohydrate Polymers
Volume102
Issue number1
DOIs
Publication statusPublished - Feb 15 2014

Fingerprint

Starch
Thermoplastics
Wood
Composite materials
Water
Fibers
Dimensional stability
Water absorption
Glycerol
Tensile properties
Aspect ratio
Adhesion
Stiffness
Adsorption
Molecules

Keywords

  • Interfacial adhesion
  • Particle characteristics
  • Shrinkage
  • TPS/wood composites
  • Water absorption

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Thermoplastic starch/wood composites : Interfacial interactions and functional properties. / Müller, Péter; Renner, Károly; Móczó, J.; Fekete, E.; Pukánszky, B.

In: Carbohydrate Polymers, Vol. 102, No. 1, 15.02.2014, p. 821-829.

Research output: Contribution to journalArticle

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