Villalta-Céspedes Andres, Cárdenas-Oscanoa Aldo Joao, Euring Markus, Moya Roger
Escuela de Ingeniería Forestal, Instituto Tecnológico de Costa Rica, Cartago Apartado 159-7050, Costa Rica.
Department of Wood Technology and Wood-Based Composites, Georg-August University Goettingen, Goettingen 37073, Germany.
ACS Omega. 2025 Jul 2;10(27):29351-29364. doi: 10.1021/acsomega.5c02267. eCollection 2025 Jul 15.
The utilization of composite sandwich panels (CSP) with a core composed of wood or natural fibers presents a sustainable option for building insulation to address climate change. This study aims to produce and assess CSP thermoacoustic insulators by examining their physical, mechanical, acoustic, and thermal characteristics. The panels, with thicknesses of 12 and 19 mm, are constructed using cores of balsawood or pineapple leaves () (PALF) variety M2 and melina wood () as veneer. Findings indicate that the density of the panels was from 222 to 266 kg m for CSP-balsawood and from 210 to 303 kg m for CSP-PALF. Regarded water absorption panel values, for CSP-balsawood is between 60 and 69% while for CSP-PALF, it is between 104 and 128%. Swelling values of 0.92-1.53 and 3.4-8.5% are for CSP-balsawood and CSP-PALF, respectively. The CSP-balsawood demonstrated superior modulus of rupture and modulus of elasticity values in static bending in both longitudinal and parallel directions, as well as in compression and tension. Furthermore, with the same core material, the 19 mm CSP exhibited greater density and mechanical properties compared to the 12 mm CSP. Thermal resistance is 0.26 to 0.30 and 0.19 to 0.25 W m K for panels from balsawood and PALF, respectively, with the highest thermal conductivity observed at a 19 mm thickness in both cases. During sound absorption testing, the SAC coefficient was found to be less than 0.33 sound absorption coefficient for different panels, which is characteristic of insulation panels. Results reported that CSP-balsawood is suitable for applications where sound insulation is a priority, whereas those made with PALF are more appropriate when thermal insulation is the primary concern. The fabrication of CSP with natural products enhances energy efficiency, improves spatial conditions, and decreases energy consumption, thereby contributing to climate change mitigation.
利用由木材或天然纤维组成芯材的复合夹芯板（CSP）为建筑保温提供了一种可持续的选择，以应对气候变化。本研究旨在通过研究其物理、机械、声学和热学特性来生产和评估CSP热声绝缘体。这些厚度为12毫米和19毫米的板材，使用轻木芯或菠萝叶（PALF）品种M2以及桃花心木作为单板构建而成。研究结果表明，CSP-轻木板材的密度为222至266千克/立方米，CSP-PALF板材的密度为210至303千克/立方米。就吸水面板值而言，CSP-轻木的吸水率在60%至69%之间，而CSP-PALF的吸水率在104%至128%之间。CSP-轻木和CSP-PALF的膨胀率分别为0.92 - 1.53%和3.4 - 8.5%。CSP-轻木在纵向和平行方向的静态弯曲以及压缩和拉伸方面均表现出卓越的断裂模量和弹性模量值。此外，使用相同的芯材时，19毫米厚的CSP比12毫米厚的CSP具有更高的密度和机械性能。轻木和PALF板材的热阻分别为0.26至0.30瓦/（米·开尔文）和0.19至0.25瓦/（米·开尔文），两种情况下在19毫米厚度时均观察到最高的热导率。在吸声测试中，不同板材的SAC系数被发现小于0.33吸声系数，这是保温板的特征。结果表明，CSP-轻木适用于优先考虑隔音的应用，而用PALF制成的板材在主要关注隔热时更合适。用天然产品制造CSP可提高能源效率、改善空间条件并降低能源消耗，从而有助于缓解气候变化。
