Yang Zixuan, Meng Xin, Zeng Guangda, Wei Jinguang, Wang Chuangui, Yu Wenji
School of Materials and Chemistry, Anhui Agricultural University, Hefei 230036, China.
Key Laboratory of National Forest and Grassland Administration on Wood Quality Improvement & Efficient Utilization, Anhui Agricultural University, Hefei 230036, China.
Polymers (Basel). 2024 Mar 13;16(6):797. doi: 10.3390/polym16060797.
Bamboo scrimber is acknowledged for its eco-friendly potential as a structural material. Its properties are significantly affected by both its density and resin content, but the effect of resin content on the properties under high density is not yet known. In this study, the microstructure, water resistance, mechanical properties, and thermal stability of bamboo scrimbers with varying resin content at a density of 1.30 g/cm were investigated. The results unearthed that phenolic resin assisted in the densification of bamboo cells during hot pressing, and a higher resin content could effectively reduce the cracks in the scrimber. The inherent cellulose I structure remained unaffected, but an increase in resin content led to a noticeable decline in crystallinity. Additionally, an increase in resin content pronouncedly improved the water resistance and dimensional stability of bamboo scrimbers. The water absorption and thickness swelling were as low as 9.67% and 7.62%, respectively. The modulus of rupture (MOR) exhibited a marginal increase with the amount of resin, whereas the compressive strength and short-beam shearing strength first increased and then decreased. Their peak strengths were 327.87 MPa at a resin content of 15 wt.%, and 168.85 MPa and 25.96 MPa at 11 wt.%, respectively. However, phenolic resin accelerated the thermal decomposition of bamboo scrimbers, and more resin worsened the thermal stability. These research outcomes offer a dual advantage, providing both a theoretical foundation and concrete data that can inform the production and practical application of high-density bamboo scrimbers.
竹重组材作为一种结构材料，因其环保潜力而受到认可。其性能受密度和树脂含量的显著影响，但高密度下树脂含量对性能的影响尚不清楚。本研究对密度为1.30 g/cm 、树脂含量不同的竹重组材的微观结构、耐水性、力学性能和热稳定性进行了研究。结果发现，酚醛树脂在热压过程中有助于竹材细胞的致密化，较高的树脂含量可有效减少重组材中的裂缝。其固有的纤维素I结构未受影响，但树脂含量的增加导致结晶度显著下降。此外，树脂含量的增加显著提高了竹重组材的耐水性和尺寸稳定性。吸水率和厚度膨胀率分别低至9.67%和7.62%。抗弯强度（MOR）随树脂用量略有增加，而抗压强度和短梁抗剪强度先增加后降低。它们的峰值强度分别在树脂含量为15 wt.%时为327.87 MPa，在11 wt.%时为168.85 MPa和25.96 MPa。然而，酚醛树脂加速了竹重组材的热分解，树脂含量越高，热稳定性越差。这些研究成果具有双重优势，为高密度竹重组材的生产和实际应用提供了理论基础和具体数据。
