Publication detail

Penetration Process of Polyurethane Adhesive into the Wood Ultrastructure

VANĚREK, J. BÖHM, M. BĚŤÁK, A. KULICH, P. MAŠEK, J.

Original Title

Penetration Process of Polyurethane Adhesive into the Wood Ultrastructure

Type

conference paper

Language

English

Original Abstract

The main goal of this paper was to ascertain the exact distribution of one-component polyurethane adhesive in the structure of spruce wood. The used polyurethane (PUR) adhesive meets the requirements set out by EN 301 for bonding structural timber. Fluorochrome Rhodamine B showed sufficient fluorescence when mixed with the PUR adhesive in the amount of 2.5% (diluted in N,N-Dimethylformamide) and subsequent fluorescence microscopy showed the distribution of adhesive in the lumen and in the medullary rays of spruce wood. The adhesive penetration in the transverse direction made its way to the 4th row of wood cells from the bondline. The existence of the adhesive in lumens that were further away was caused by adhesive penetration in medullary rays. Using transmission electron microscopy, the CaCO3 nanoparticles that were deagglomerated in the adhesive using ultrasound were only observed in the lumens of wood cells. The energy dispersive X-ray analysis of the bondline area only detected iodine (dispersed in an amount of 10% and 20% by weight in PUR) in the lumens of the wood cell, and in much higher amounts than in the cell wall. All of the experimental techniques used show that the one-component polyurethane adhesive is not able to penetrate the cell wall structure.

Keywords

Polyurethane, Structural timber, Adhesive penetration, Bonded joints

Authors

VANĚREK, J.; BÖHM, M.; BĚŤÁK, A.; KULICH, P.; MAŠEK, J.

Released

9. 8. 2022

Publisher

AIP Publishing LLC

Location

Melville (NY), Spojené státy

ISBN

978-0-7354-4247-4

Book

AIP Conference Proceedings 2611

Edition

vol. 1

Pages from

040008-1

Pages to

040008-5

Pages count

5