Vpliv temperature termične modifikacije na omočljivost modificiranega lesa

diplomsko delo - visokošolski strokovni študij

Matej Štrovs (Author), Milan Šernek (Reviewer), Marko Petrič (Mentor)

Abstract

Termična modifikacija lesa bistveno spremeni lastnosti lesa. Z vidika površinske obdelave sta pomembni lastnosti omočljivost in prosta površinska energija. Les smreke smo termično modificirali pri temperaturah 70 °C, 105 °C,120 °C, 140 °C, 180 °C in 210 °C. Vzorcem smo s tehtanjem po končani termični modifikaciji določili izgubo mase. Na modificiranih vzorcih smo kontaktne kote destilirane vode, dijodometana in formamida merili po Wilhelmyjevi metodi s ploščico, s tenziometrom (Krüss Processor Tensiometer K100). Iz izmerjenih kontaktnih kotov smo izračunali proste površinske energije modificiranih vzorcev po metodi Owens/Wendt/Rabel/Kaelble. Ugotovili smo, da z naraščanjem temperature termične modifikacije lesa narašča tudi izguba mase. Zaznali smo vpliv temperature termične modifikacije na kontaktni kot tekočin na lesu. Pri destilirani vodi smo na primer ugotovili dvig kontaktnih kotov s povišano temperaturo modifikacije. Izračuni površinskih energij kažejo rahlo naraščanje proste površinske energije z višanjem temperature termične modifikacije lesa.

Keywords

les;termična modifikacija;prosta površinska energija;kontaktni kot;

Data

Language:	Slovenian
Year of publishing:	2010
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[M. Štrovs]
UDC:	630*829
COBISS:	1852809
Views:	1220
Downloads:	268
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Influence of thermal modification temperature on wettability of wood
Secondary abstract:	Thermal modification of wood significantly changes its properties. For the purpose of surface finishing, the main characteristics of wood are its wettability and surface free energy. Spruce wood was thermally modified at temperatures of 70 °C, 105 °C, 120 °C, 140 °C, 180 °C and 210 °C. After the thermal modification process, we determined mass loss of the samples. On the modified specimens, we measured contact angles of distilled water, diiodomethane and formamide by the Wilhelmy plate method with a Kruss tensiometer K100. Using the obtained data we calculated surface free energy of the modified samples by the Owens/Wendt/Rabel/Kaelble method. We found out that with increasing temperature of thermal modification, mass loss increases also. We also stated that the modification temperature influences contact angles of liquids on wood. For instance, we noticed an increase of contact angles of the distilled water with the increase of the modification temperature. Surface energy calculations showed its slight increase also with the raise of modification temperature.
Secondary keywords:	wood;thermal modification;surface free energy;contact angle;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	IX, 44 f., [3] f. pril.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID:	21983