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Curing kinetics of tannin and lignin biobased adhesives determined by DSC and ABES
ID Saražin, Jaša (Avtor), ID Poljanšek, Ida (Avtor), ID Pizzi, Antonio (Avtor), ID Šernek, Milan (Avtor)

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Opis: Open access

Izvleček
The curing process of two biobased adhesives: pine tanninhexamine (TH) and organosolv lignin non-isocyanate polyurethane (NIPU), suitable for interior nonstructural use, were compared with commercial urea-formaldehyde (UF) adhesive. Changes in chemical structure before and after the curing process were observed with Fouriertransform infrared spectroscopy (FTIR). The process of adhesive curing was monitored with differential scanning calorimetry (DSC) and the automated bonding evaluation system (ABES). Both DSC and ABES measurements confirmed UF as the fastest and NIPU as the slowest curing adhesive observed. Taking into account the ABES results, the optimal pressing parameters for the TH adhesive would be 4 min at 175°C, for the NIPU adhesive 7 min at 200°C and for the UF 1.5 min at 100°C. Strong linear correlation was observed between mechanical and chemical curing for the UF and NIPU adhesives, whereas lower correlation was observed for the TH adhesive. At all observed adhesives, the DSC measurements were underestimating the curing process determined by ABES in the first part and overestimating it at the end. The underestimation was the most evident with the TH adhesive and the less with the UF adhesive. When comparing the uncured and cured FTIR spectra of all three types of adhesives, a drastic decrease in the characteristic band of -OH groups at 3330–3400 cm−1 and an increase in the signal intensity at 2920 cm−1 of aliphatic -CH2-groups were observed. For the UF adhesive, the C=O stretching frequency has shifted from 1632 cm−1 for uncured to three different bands at 1766, 1701, and 1655 cm−1 for cured UF. The sharp band for phenolic alcohols at 1236 cm−1 of C–O stretch and hydroxyl O–H functional group at 1009 cm−1 and at 684 cm−1 of uncured TH adhesive diminished during curing, which indicates that a crosslinking reaction occurs via -OH groups. The peak of the C=O group of urethane bridges at 1697 cm−1 for uncured NIPU shifted to lower wavenumber at 1633 cm−1 for cured NIPU.

Jezik:Angleški jezik
Ključne besede:biobased adhesives, curing kinetics, tannin, lignin, ABES, DSC, FTIR
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:BF - Biotehniška fakulteta
Leto izida:2022
Status objave pri reviji:Objavljeno
Verzija članka:Založnikova različica članka
Št. strani:Str. 1-15
Številčenje:Vol. , no.
PID:20.500.12556/RUL-134468 Povezava se odpre v novem oknu
UDK:630*8
ISSN pri članku:2164-6341
DOI:10.32604/jrm.2022.019602 Povezava se odpre v novem oknu
COBISS.SI-ID:93163779 Povezava se odpre v novem oknu
Datum objave v RUL:17.01.2022
Število ogledov:356
Število prenosov:195
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Gradivo je del revije

Naslov:Journal of renewable materials
Skrajšan naslov:J. renew. mater.
Založnik:Scrivener
ISSN:2164-6341
COBISS.SI-ID:20677123 Povezava se odpre v novem oknu

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:11.01.2022

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:biolepila, kinetika utrjevanja, tanin, lignin

Projekti

Program financ.:ERA - Co BioTech WooBAdh

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P4-0015
Naslov:Les in lignocelulozni kompoziti

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