Evaluation of Water Vapor Diffusion of Empress Tree Hybrid Samples With Adhesive

Zinad, Omar Saber és Csiha, Csilla (2026) Evaluation of Water Vapor Diffusion of Empress Tree Hybrid Samples With Adhesive. APPLIED SCIENCES-BASEL, 16 (6). ISSN 2076-3417

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Absztrakt (kivonat)

In Hungary, a fast-growing but previously unproductive Empress tree hybrid (× Paulownia Clone in vitro 112) also known as Smaragdfa® has been developed as a low-density plantation species for industrial applications. Despite its favorable dimensional stability and low shrinkage, the pres-ence of adhesives in bonded assemblies may induce undesired internal stresses due to restricted water vapor diffusion. This study evaluates the water vapor diffusion characteristics of Smaragdfa samples, both uncoated and coated with different adhesive and lasure layers, to assess their suita-bility for door and window production. Experiments were conducted following ISO 12572 and ASTM E96 standards using the cup method, with all specimens pre-conditioned to 12% moisture content. Results showed that the uncoated Smaragdfa (SMW) exhibited the highest diffusion coeffi-cient (δ = 7.02 × 10⁻¹³ kg/(m·s·Pa)) and flow rate (G = 0.055763 g/h), while the commercial adhesive-coated sample (SMA) displayed an 84% reduction in diffusion capacity (δ = 1.15 × 10⁻¹³ kg/(m·s·Pa)), indicating a strong vapor-blocking effect. The lasure coating (SML) allowed partial vapor transmis-sion, confirming its semi-permeable nature. Adhesives formulated with varying polyol molecular weights (Series 1–5) revealed a clear molecular-weight-dependent behavior: low-MW systems (S1) acted as strong diffusion barriers comparable to SML, high-MW systems (S4, S5) permitted exces-sive diffusion but induced microcracking, while intermediate formulations (S2, S3) achieved the most balanced performance, combining moderate diffusion with structural stability. Overall, the findings confirm that adhesive layers significantly influence water vapor transmission through Smaragdfa wood, with the degree of hindrance closely related to both coating type and molecular weight of the polyol matrix. The optimized formulations (S2, S3) demonstrate promising potential for use in engineered wood products where controlled vapor diffusion and mechanical reliability are critical.

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műszaki tudományok > anyagtudományok és technológiák

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Mű tipusa:	Cikk
SWORD Depositor:	Teszt Sword
Felhasználó:	Csaba Horváth
A mű MTMT azonosítója:	MTMT:36938534
Dátum:	07 Ápr 2026 08:43
Utolsó módosítás:	07 Ápr 2026 08:43
URI:	http://publicatio.uni-sopron.hu/id/eprint/3960

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