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In-situ modification of low molar ratio urea–formaldehyde resins with cellulose nanofibrils for plywood.

Authors :
Wibowo, Eko Setio
Lubis, Muhammad Adly Rahandi
Park, Byung-Dae
Source :
Journal of Adhesion Science & Technology. Nov 2021, Vol. 35 Issue 22, p2452-2465. 14p.
Publication Year :
2021

Abstract

This study describes the in-situ modification of low molar ratio urea–formaldehyde (UF) resins with cellulose nanofibrils (CNFs) to improve the poor performance of resins synthesized with different methods (Synth 1 and Synth 2) when adding second urea. UF resins were in-situ modified with CNFs dissolved in a mixture of dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) during the alkaline reaction step. Results showed that CNF addition enhanced the resin properties, such as shorter gelation time, faster curing rates at low activation energy, higher tensile shear strength (TSS), and lower formaldehyde emission (FE), compared to those of neat resins. The dry and wet TSS values of plywood bonded with UF resins modified with 3% CNFs synthesized using Synth 2 increased by 30% and 42%, respectively, and the FE value was decreased by 22% and 42%, respectively. These results reveal that in-situ modified UF resins with CNFs showed better performance than neat UF resins and that Synth 2 was more favorable than Synth 1. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
01694243
Volume :
35
Issue :
22
Database :
Academic Search Index
Journal :
Journal of Adhesion Science & Technology
Publication Type :
Academic Journal
Accession number :
153607687
Full Text :
https://doi.org/10.1080/01694243.2021.1890370