Preparation and characterization of green adhesives using modified tannin and hyperbranched poly (amine-ester)

Published Date
December 2016, Vol.71:39–47, doi:10.1016/j.ijadhadh.2016.08.009 

Author

Abbas Hasan Faris ^a,,

Mohamad Nasir Mohamad Ibrahim ^b

Afidah Abdul Rahim ^b

• aLignocellulosic Research Group, Directorate of Materials Research, Ministry of Higher Education and Scientific Research, Baghdad, Iraq
• bLignocellulosic Research Group, School Of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia

Accepted 18 August 2016. Available online 26 August 2016.

Abstract

Tannin-glyoxalated Kraft lignin (TGKL) resin is a successful substitution for phenol formaldehyde resin in the production of wood adhesives, however it has a poor water resistance. To overcome this obstacle, this research was focused on scalable adhesive through the modified tannin adhesive and oligomeric precursors of a hyperbranched poly (amine-ester) (HBPAE). The prepared glyoxalated Kraft lignin resin (MTGKL), TGKL, HBPAE and commercial phenol formaldehyde (CPF) resin were evaluated by FTIR, ¹H and ¹³C NMR spectroscopy. The tensile strengths and thermal stability were determined. The results indicated that the addition of HBPAE to tannin adhesive could improve the water resistance of MTGKL. This was evident when soaking plywood bonded with TGKL in cool water, where delamination occurred, but it was not evident with MTGKL. The tensile results indicated that the adhesive strengths of MTGKL, 39.72 MPa (dry) and 27.62 MPa (wet), were higher compared to TGKL and CPF resins.

Keywords

Hyper branched poly (amine-ester)

Modification of tannin

Glyoxalated Kraft lignin

Tensile strength ¹³C NMR

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  Corresponding author.
  
  

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