Wood adhesion and adhesives

25 Setembro 2025, 11:15 • José Afonso Rodrigues Graça

Engineered wood and wood composites

Wood based panels and structural engineered wood

Classification of wood adhesives

Adhesion mechanisms: mechanical, chemical and specific adhesion

Formaldehyde-based adhesives: PF, UF, MF nad RF

Isocyanate (pMDI) resins

Thermoplastic adhesives: poly(vinyl)acetate

Resistance of glue lines

Durability of adhesives

 

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Field trip

19 Setembro 2025, 11:15 • José Afonso Rodrigues Graça

Field trip of Restauro Florestal e Agro-florestal course

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Wood structure and properties_a review (3/3)

18 Setembro 2025, 11:15 • José Afonso Rodrigues Graça

Wood density

Wood density and moisture content

Juvenile and mature wood

Knots in wood

Wood types and pruning

 

Wood mechanical properties – basic stresses

Static bending – MOE and MOR

Effect of the slope of grain

Wood strength as determined by density

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Wood structure and properties_a review (2/3)

12 Setembro 2025, 11:15 • José Afonso Rodrigues Graça

Wood chemical composition – structural biopolymers

Organization of cellulose into microfibrils

Orientation of microfibrils in cell walls – microfibrilar angle

Water as wood component

Free water and bound water

Fiber saturation point

Wood shrinkage and swelling

Anisotropy of wood dimensional variation

 

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Wood structure and properties_a review (1/3)

11 Setembro 2025, 11:15 • José Afonso Rodrigues Graça

Forest products as raw materials

The structure of tree trunks

Wood growth rings

Two basic types of wood - hardwood and softwoods

Wood as a material mode of cells

Pits – flow between cells in softwood tracheids

Perforation plates – flow of water in hardwood vessels

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