Development of specified risk material-based plywood adhesive with enhanced water resistivity

• Author / Creator

  Kislitsin, Vadim Y

• Canadian plywood industry with its 2 billion square feet annual capacity [83] requires a large amount of adhesive materials to satisfy its needs. This forces plywood manufacturers to consider the utilization of agricultural bio-waste to create environmentally friendly adhesive materials with the properties similar to those commercially available in the market. Released in 2007, the Enhanced Feed Ban made available thousands of tonnes of Specified Risk Material (SRM) – tissues of cattle where abnormally folded proteins – prions that cause Bovine Spongiform Encephalopathy (BSE) disease, are the most likely to be concentrated. The recent studies show that if hydrolyzed according to the Canadian Food Inspection Agency protocol, prions get irreversibly broken down and SRM contains a sufficient amount of useful proteinaceous material. The purpose of this research was to develop an adhesive (glue) material with outstanding water resistive properties for potential application in plywood industry and to evaluate its performance. Hydrolyzed SRM was chemically modified by esterification reaction with alcohol. The degree of esterification and other characteristics were evaluated with size exclusion high performance liquid chromatography (SEC-HPLC), sodium dodecyl sulphate poly-(acrylamide) gel electrophoresis (SDS-PAGE), Fourier transform infrared spectroscopy (FTIR), contact angle measurement, and qualitative calculation of free carboxylic groups. The modified SRM appeared to have better water resistant properties that the original SRM. The modified SRM was further crosslinked with glutaraldehyde and further evaluated with Fourier transform infrared spectroscopy (FTIR). The adhesive properties of crosslinked esterified SRM were evaluated in accordance with the American Standard of Testing Materials (ASTM) standard technique – lap shear stress evaluation of an adhesive bonded joint using the Instron MTS 810 equipment. Overall, this study has showed that the chemical modification of SRM by esterification improves water resistance of hydrolyzed SRM. The adhesive material developed by crosslinking of chemically modified SRM with glutaraldehyde performed well and passed the standard requirements by ASTM showing that the pressing temperature is the crucial factor in the application of SRM-based adhesive of the evaluated formulation.

• Subjects / Keywords

  • Plywood
  • Adhesive
  • Wood adhesive
  • Specified risk material
  • SRM

• Graduation date

  Fall 2016

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3M90278C

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.