Preparation of biodegradable foam from walnut shells treated by subcritical water

Wei Yang, Ichiro Shimizu, Tsutomu Ono, Yukitaka Kimura

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

BACKGROUND: Subcritical water treatment is considered an environment-friendly method to liquefy biomass to prepare valuable chemicals. Several researchers have studied the solid obtained after autohydrolysis treatment for use as reinforcement in biocomposities and was the base pulp and paper technologies. The novelty of this present research is the use of solid in the manufacture of starch foams. RESULTS: Subcritical water was used to extract hemicellulosic carbohydrate from walnut shells at temperatures from 160 to 260°C for 15min and at 200°C for various treatment times. The maximum yield was obtained at 200°C for 15min. The residue of the walnut shells obtained at the maximum carbohydrates extraction yield was used to prepare a biodegradable foam by compounding with corn starch using a technique similar to compression molding. It was found that replacing 20% of the corn starch by the residue had no deleterious effects on the density and morphology, as indicated by scanning electron microscopy. The prepared foams had a dense outer skin and a less dense interior with large, mostly open cells. The flexural strains were similar to that of foamed polystyrene and the flexural modulus and flexural stresses were larger. CONCLUSION: It was considered that the prepared biodegradable foam was a promising material to take the place of plastic products in the future.

Original languageEnglish
Pages (from-to)44-49
Number of pages6
JournalJournal of Chemical Technology and Biotechnology
Volume90
Issue number1
DOIs
Publication statusPublished - Jan 1 2015

Fingerprint

Juglans
foam
Starch
Foams
starch
shell
Zea mays
Water
Carbohydrates
carbohydrate
Water Purification
maize
Polystyrenes
Plastic products
Electron Scanning Microscopy
water
Biomass
Plastics
Compression molding
Water treatment

Keywords

  • Biodegradable foam
  • Corn starch
  • Residue
  • Subcritical water
  • Walnut shell

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Biotechnology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment
  • Pollution
  • Waste Management and Disposal
  • Inorganic Chemistry
  • Organic Chemistry

Cite this

Preparation of biodegradable foam from walnut shells treated by subcritical water. / Yang, Wei; Shimizu, Ichiro; Ono, Tsutomu; Kimura, Yukitaka.

In: Journal of Chemical Technology and Biotechnology, Vol. 90, No. 1, 01.01.2015, p. 44-49.

Research output: Contribution to journalArticle

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