izpis_h1_title_alt

Photostabilization of rubberwood using cerium oxide nanoparticles : Characterization and colour changes
Srinivas, Kavyashree (Author), Kumar Pandey, Krishna (Author), Petrič, Marko (Author)

URLURL - Source URL, Visit http://www.les-wood.si/index.php/leswood/article/view/85/56 This link opens in a new window
.pdfPDF - Presentation file, Download (2,75 MB)
MD5: 5036B07047FD37EF2D966D28A2A29455

Abstract
Light induced darkening and deterioration of wood used outdoors is undesirable. Photoprotection of wood could be achieved by using additives that reflect or absorb harmful radiation responsible for degradation. Nano metal oxides have strong absorption in the UV range of solar radiation and good transparency in the visible region. They offer unique benefits in protecting coatings and coated substrates from being degraded by UV radiation. However, to exploit the properties of nanoparticles, homogenous dispersion without agglomeration is necessary. In the present work, the photostabilization of rubberwood surfaces coated with cerium oxide (CeO2) was studied. The nanoparticles were surface functionalized with an organic alkoxy silane (3-glycidyloxypropyltrimethoxy silane) to improve the homogenous distribution in coatings, and the modified nanoparticles were dispersed in isopropanol and polyurethane (PU) coating. Rubberwood surfaces coated with dispersed nanoparticles (concentration 0.5 % to 6 % w/v) were exposed to a fluorescent UVA light source (λ=340 nm) at 60 °C in an accelerated weathering tester for 500 h and 1000 h. Colour changes due to UV light exposure were monitored using a spectrocolourimeter. Dispersion of CeO2 nanoparticles in PU coatings (concentration >2 %) restricted the photoyellowing of wood polymers.

Language:English
Keywords:Rubberwood, PU coating, nanoparticle, Cerium oxid, photostability, colour stability
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2020
Number of pages:Str. 57-70
Numbering:Letn. 69, št. 1
UDC:630*8
ISSN on article:0024-1067
DOI:10.26614/les-wood.2020.v69n01a06 This link opens in a new window
COBISS.SI-ID:20473347 This link opens in a new window
Views:15
Downloads:13
Metadata:XML RDF-CHPDL DC-XML DC-RDF
 
Average score:(0 votes)
Your score:Voting is allowed only to logged in users.
:
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Record is a part of a journal

Title:Les
Shortened title:Les
Publisher:Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Biotehniška fakulteta, Oddelek za lesarstvo
ISSN:0024-1067
COBISS.SI-ID:13940224 This link opens in a new window

Document is financed by a project

Funder:Drugi - Drug financer ali več financerjev
Funding Programme:CSIR
Project no.:Grant No 38(1198/08/EMR)
Name:

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:29.04.2021

Secondary language

Language:Slovenian
Title:Fotostabilizacija lesa kavčukovca z nanodelci cerijevega dioksida : karakterizacija in spremembe barve
Abstract:
Degradacija in potemnitev lesa, ki je v uporabi na prostem, je nezaželena. Les je pred učinki svetlobe možno zaščititi z dodatki, ki odbijajo ali absorbirajo škodljivo sevanje, ki povzroča njegovo razgradnjo. Nano kovinski oksidi izkazujejo močno absorpcijo svetlobe v UV območju sončnega sevanja in dobro transparentnost v vidnem območju. Zato ponujajo edinstvene prednosti pri zaščiti premazov in površinsko obdelanih substratov, ki so občutljivi na UV sevanje. Vendar pa je za izkoriščanje zaščitnih lastnosti nanodelcev potrebna njihova homogena disperzija, tako da se ne tvorijo aglomerati. V tem prispevku poročamo o raziskavah fotostabilizacije površin lesa kavčukovca z nanodelci cerijevega dioksida (CeO2). Nanodelci so bili površinsko funkcionalizirani z organskim alkoksi silanom (3-glicidiloksi propiltrimetoksi silan) za izboljšanje homogene porazdelitve v premazih. Modificirane nanodelce smo dispergirali v izopropanolu in v poliuretanskem (PU) premazu. Površine lesa kavčukovca, na katere smo nanesli dispergirane nano-delce (koncentracija od 0,5 % do 6 % m/v), smo v napravi za umetno pospešeno staranje za 500 ur in 1000 ur in pri 60 °C izpostavili UVA svetlobi (% = 340 nm). Barvne spremembe zaradi izpostavitve UV svetlobi smo spremljali s kolorimetrom. Disperzija nanodelcev CeO2 v PU premazih (koncentracija >2 %) je zmanjšala foto-rumenenje lesnih polimerov.

Keywords:kavčukovec, PU premaz, nanodelci, cerijev dioksid, fotostabilnost, stabilnost barv

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections:

Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back