Odpornost izolacijskih pen na osnovi tanina iz skorje iglavcev proti glivam

diplomski projekt

Ervin Žveplan (Author), Miha Humar (Reviewer), Milan Šernek (Mentor)

Abstract

Proučevali smo odpornost pen na osnovi tanina iz skorje iglavcev proti glivam. Pripravili smo 4 različne sestave taninskih pen. Iz utrjenih taninskih pen smo nažagali preizkušance in jim izmerili dimenzije ter maso. Nato smo preizkušance 3 dni izpirali z destilirano vodo in jih na koncu posušili na absolutno suho stanje (103 °C, 24 h). Preizkušancem smo ponovno izmerili dimenzije in jih stehtali ter izračunali gostoto pen pred in po izpiranju. Ugotovili smo, da se je masa preizkušancev po izpiranju razpolovila, volumen pa se je po osušitvi zmanjšal za tretjino. V petrijevkah smo pripravili gojišče za glive, jih cepili in po 1 tednu nanje položili preizkušance iz pen in lesa; ti so bili glivam izpostavljeni 8 tednov. Uporabili smo 1 glivo rjave trohnobe (navadna tramovka- Gloeophyllum trabeum) in 1 glivo bele trohnobe (bukov ostrigar-Pleurotus ostreatus). Po 8 tednih smo iz preizkušancev očistili micelij in jih stehtali. Preizkušance smo po tehtanju osušili na absolutno suho stanje in jih ponovno stehtali. Iz dobljenih podatkov pred in po izpostavitvi glivam smo izračunali izgubo mase. Ugotovili smo, da so pene na osnovi tanina iz skorje iglavcev odporne na lesne glive, saj je bila izguba mase v primerjavi z lesenimi preizkušanci precej manjša.

Keywords

izolativne pene;tanin;lesne glive;

Data

Language:	Slovenian
Year of publishing:	2013
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[E. Žveplan]
UDC:	630813:630852.4
COBISS:	2144137
Views:	318
Downloads:	73
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Resistance of insulating foams based on tannin from the bark of conifers against fungi
Secondary abstract:	We thoroughly studied the resistance of tannin-based foams from the bark of conifers against fungi. We prepared 4 different structures of tannin foams. Foam samples were sawn of hardened tannin-based foams; then their dimensions and weight measured. Foam samples were infused in distilled water for 3 days, and dried to an absolute dry condition (103 °C, 24h). Their dimensions and weight were re-measured; the density of foams was calculated before and after soaking. After the soaking and drying the mass of the foam samples halved; while the volume after the drying decreased by a third. In petri dishes, a habitat for fungi was prepared, fungi inoculated, and after a week the samples made of foams and wood exposed to fungi for 8 weeks. We used one brown rot fungus (Gloeophyllum trabeum) and one white rot fungus (the oyster mushroom, Pleurotus ostreatus). After the explosion mycelia were cleaned out of the samples and weighted. The samples then dried to an absolute dry condition, and re-weighted. From the data obtained before and after the exposure to fungi, the mass loss was calculated. We ascertained that tannin-based foams from the bark of conifers were resistant to wood fungi, because the loss of mass compared to the wood samples was much smaller.
Secondary keywords:	insulation foams;tannin;wood fungi;
Type (COBISS):	Diploma project paper
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	VIII, 29 f.
ID:	11902841