<abstract xmlns="http://www.w3.org/1999/xhtml"> The effect of chemical modification on mechano-sorptive creep in bending was studied by experimental work. Stakes with 20 × 20 × 400 mm RTL of Portuguese wood species (Pinus pinaster Aiton) modified with 1,3-dimethylol-4,5- dihydroxyethyleneurea (DMDHEU), m-methylated melamine resin (MMF), tetraethoxysilane (TEOS) and amid wax (WA) were measured under asymmetric moistening conditions over a period of 42 days (app. 1000 hours) with stress level (SL) of 12 MPa, according to ENV 1156. The cell wall treatments (DMDHEU and MMF resins) had shown significant reduction of creep (creep factors, kc) when compared to untreated wood under similar conditions. Both types of resins and levels of treatments (different WPG) did not shown significant effects. In the lumen fill treatments, deposit material of TEOS did not affected the creep behaviour (kc); Wax treatment was shown a particular compliance of creep due to avoid exchange moisture (by the hydrophobic effect of wax). The anti-creep efficiency (ACE) correlated better than other mechanical or physical properties imparted by the modification process</abstract>

The effect of chemical modification on mechano-sorptive creep in bending was studied by experimental work. Stakes with 20 × 20 × 400 mm RTL of Portuguese wood species (Pinus pinaster Aiton) modified with 1,3-dimethylol-4,5- dihydroxyethyleneurea (DMDHEU), m-methylated melamine resin (MMF), tetraethoxysilane (TEOS) and amid wax (WA) were measured under asymmetric moistening conditions over a period of 42 days (app. 1000 hours) with stress level (SL) of 12 MPa, according to ENV 1156. The cell wall treatments (DMDHEU and MMF resins) had shown significant reduction of creep (creep factors, kc) when compared to untreated wood under similar conditions. Both types of resins and levels of treatments (different WPG) did not shown significant effects. In the lumen fill treatments, deposit material of TEOS did not affected the creep behaviour (kc); Wax treatment was shown a particular compliance of creep due to avoid exchange moisture (by the hydrophobic effect of wax). The anti-creep efficiency (ACE) correlated better than other mechanical or physical properties imparted by the modification process

Mechano-sorptive creep of Portuguese pinewood chemically modified

School of Engineering – Polytechnic of Porto, Rua Dr. António Bernardino de Almeida 431, 4200-072 Porto, Portugal, phone: +351228340500, fax: +351228321159

Wood Biology and Wood Products, Büsgenweg 4 - 37077, Germany

Folia Forestalia Polonica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Mechano-sorptive creep of Portuguese pinewood chemically modified"}

The effect of chemical modification on mechano-sorptive creep in bending was studied by experimental work. Stakes with 20 × 20 × 400 mm RTL of Portuguese wood...

Mechano-sorptive creep of Portuguese pinewood chemically modified

Pubblicato online: 10 lug 2014

Pagine: 30 - 44

Ricevuto: 02 nov 2012

Accettato: 02 ott 2013

DOI: https://doi.org/10.2478/ffp-2014-0004

Parole chiave
admid wax, bending creep, creep factor, mechano-sorptive effect, Pinus pinaster, resins

© 2014

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mechano-sorptive creep of Portuguese pinewood chemically modified

Pubblicato online: 10 lug 2014

Pagine: 30 - 44

Ricevuto: 02 nov 2012

Accettato: 02 ott 2013

DOI: https://doi.org/10.2478/ffp-2014-0004

Parole chiaveadmid wax, bending creep, creep factor, mechano-sorptive effect, Pinus pinaster, resins

© 2014

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Parole chiave
admid wax, bending creep, creep factor, mechano-sorptive effect, Pinus pinaster, resins