One‐component polyurethane adhesives for green wood gluing: Structure and temperature‐dependent creep

Bin, Na; Pizzi, A.; Delmotte, Luc; Lu, X.

doi:10.1002/app.21529

Cited by 38 publications

(14 citation statements)

References 5 publications

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“…1,3-6 Although minimizing if not eliminating such a problem altogether has already been proposed and attempted, 4 the controversy on temperature-dependent creep of these adhesives is still ongoing.…”

Section: Introductionmentioning

confidence: 99%

Structure–property relationships in one‐component polyurethane adhesives for wood: Sensitivity to low moisture content

Beaud

Niemz

Pizzi

2006

J of Applied Polymer Sci

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ABSTRACT:The causes of strength loss of wood joints and their consequent delamination from one-component polyurethane adhesives used for bonding structural wood when used at a low moisture content was investigated by testing wood joint strength and elongation at rupture at different wood moisture contents and by 13 C-NMR spectroscopy and scanning electron microscopy of the hardened bond line. The combination of the relative proportion of the still-reactive free ONCO groups on the polyurethane, of the wise choice of degree of polymerization of the resin, and of a slower rate of reaction were the three parameters found to be important in overcoming the problem of poor or no bonding of wood at low to very low moisture contents from one-component polyurethane adhesives. The results obtained indicated that one-component polyurethane adhesives that had a combination of a higher proportion of still-unreacted ONCO groups, a lower degree of polymerization, and a slower reaction rate were capable of overcoming the problem of the high sensitivity of polyurethane gluing at low to very low wood moisture contents.

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Section: Introductionmentioning

confidence: 99%

Structure–property relationships in one‐component polyurethane adhesives for wood: Sensitivity to low moisture content

Beaud

Niemz

Pizzi

2006

J of Applied Polymer Sci

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“…Some of the tested one-component polyurethane (1C PUR) adhesives significantly lost strength from 70°C, others reached a good thermal stability up to high temperatures. Phenol-resorcinol-formaldehyde (PRF) resins showed an initial decrease of strength at around 180-190°C. Investigations on the creep behaviour of adhesive bonds were carried out by George et al (2003) and Na et al (2005), whereas a temperature dependant creep of PUR adhesives was found between 40 and 80°C. In the case of a higher initial strength (caused by a higher content of isocyanate), the creep in the low temperature range up to 50°C could be reduced.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of glued wood joints measured by shear tests

2010

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The thermal stability of glued wood joints is an important criterion to determine the suitability of adhesives in the field of engineered wood. During their product life, glued wood joints can be exposed to high temperatures in various ways (direct exposure to the sun, fire, etc.). Thereby the cohesiveness of the adhesive must not degrade. This raises the question of how the strength of bonding changes under thermal load. The current investigation covers the influence of temperature (T = 20 to 220°C) on the shear strength of glued wood joints. Different adhesive systems were investigated. With increasing temperature, the shear strength of solid wood and also of glued wood joints decreased. There were big differences in thermal stability and failure behaviour between the adhesive systems as well as within the polyurethane group. The thermal stability of one-component polyurethane systems can be greatly varied by modifying their chemical structure. Well adapted onecomponent polyurethane adhesives reach a strength similar to that of phenol resorcinol resin.

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“…In Untersuchungen zum Einfluss der Holzfeuchte und der Temperatur wurden u. a. in [8], [9], [10], [11] Zudem wurde der Holzbruchanteil visuell ermittelt.…”

Section: Erkenntnisstandunclassified

Untersuchungen zum Einfluss von Temperatur und Holzfeuchte auf das Versagensverhalten von ausgewählten Klebstoffen bei Zugscherbeanspruchung

Niemz¹,

Allenspach²

2009

Bauphysik

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Studies on the influence of temperature and timber moisture on the failure behaviour of selected adhesives under tensile shear load. The influence of temperature and relative humidity on shear strength was tested in a tensile shear test with three different adhesives. Two standard adhesives (PVAc, urea resin) and a 1KPUR (one-component polyurethane adhesive) produced in the laboratory were tested at a high temperature along with relative humidity. In addition distortion around the glue joint was measured by means of video image correlation and a shear modulus of the glue joint calculated from this.

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One‐component polyurethane adhesives for green wood gluing: Structure and temperature‐dependent creep

Cited by 38 publications

References 5 publications

Structure–property relationships in one‐component polyurethane adhesives for wood: Sensitivity to low moisture content

Structure–property relationships in one‐component polyurethane adhesives for wood: Sensitivity to low moisture content

Thermal stability of glued wood joints measured by shear tests

Untersuchungen zum Einfluss von Temperatur und Holzfeuchte auf das Versagensverhalten von ausgewählten Klebstoffen bei Zugscherbeanspruchung

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