Polyurethane Wood Adhesives Prepared from Modified Polysaccharides

Hosseinpourpia, Reza, 1983- (author): Linnéuniversitetet,Institutionen för skog och träteknik (SOT),Avancerade material,Grön hållbar utveckling,Group of Forest Products

Adamopoulos, Stergios (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Skogens biomaterial och teknologi,Department of Forest Biomaterials and Technology

(creator_code:org_t)

Related links:: https://doi.org/10.3...; show more...; https://lnu.diva-por... (primary) (Raw object); https://www.mdpi.com...; https://pub.epsilon.... (primary) (Raw object) (free); https://urn.kb.se/re...; https://doi.org/10.3...; https://res.slu.se/i...; show less...

Abstract Subject headings

This study investigated the performance of polyurethane adhesives prepared with various combinations of wheat starch that had been modified by isophorone diisocyanate (MS), two polyol types (1,3-propanediol (PD) and glycerol (Gly)), native wheat starch (NS), and 4,4′-diphenylmethane diisocyanate (pMDI) at a NCO:OH weight ratio of 1:1. Two more adhesives were also synthesized with NS, PD, or Gly and pMDI blends and served as controls. The thermal behavior of the adhesives before and after the curing process, as well as their rheological performance and lap shear strength, were analyzed. Differential scanning calorimetry (DSC) showed a reduction in curing temperature and heat by adding MS. The thermal stability of the cured adhesives was slightly increased by MS addition. The viscosity of the adhesives that contained MS substantially increased at a linear ascendant ramp of shear, while the controls exhibited relatively low viscosity during the whole shear rate spectrum from 0.1 to 100 s−1. The tensile shear strength of wood veneers was also significantly increased by the incorporation of MS under both dry and wet measuring conditions. The maximum dry shear strength was obtained for the adhesive with Gly polyol and a higher content of MS and was comparable to the control adhesive with pMDI.

By the author/editor: Hosseinpourpia, ...; Eceiza, Arantxa; Adamopoulos, Ste ...

About the subject

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Wood Science

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Polymer Chemistr ...

By the university: Linnaeus University; Swedish University of Agricultural Sciences

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