Ali Mohamed, Al-Suhaibani Zeyad, Almuzaiqer Redhwan, Al-Salem Khaled, Nuhait Abdullah, Algubllan Fahad, Al-Howaish Meshari, Aloraini Abdullah, Alqahtani Ibrahim
Mechanical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia.
Polymers (Basel). 2023 Nov 16;15(22):4422. doi: 10.3390/polym15224422.
Pineapple leaf fiber (PALF), striped sunflower seed fiber (SFSF), and watermelon seed (WMS) are considered natural waste polymer materials, which are biodegradable and sustainable. This study presents new novel thermal insulation and sound absorption materials using such waste as raw materials. PALF, SFSF, and WMS were used as loose, bound, and hybrid samples with different compositions to develop promising thermal insulation and sound-absorbing materials. Eleven sample boards were prepared: three were loose, three were bound, and five were hybrid between PALF with either SFSF or WMS. Wood adhesive was used as a binder for both the bound and hybrid sample boards. Laboratory scale sample boards of size 30 cm × 30 cm with variable thicknesses were prepared. The results show that the average thermal conductivity coefficient for the loose samples at the temperature range 20-80 °C is 0.04694 W/(m.K), 0.05611 W/(m.K), and 0.05976 W/m.K for PALF, SFSF, and WMS, respectively. Those for bound sample boards are 0.06344 W/(m.K), 0.07113 W/(m.K), and 0.08344 W/m.K for PALF, SFSF, and WMS, respectively. The hybrid ones between PALF and SFSF have 0.05921 W/m.K and 0.06845 W/(m.K) for two different compositions. The other hybrid between PALF and WMS has 0.06577 W/(m.K) and 0.07007 for two different compassions. The sound absorption coefficient for most of the bound and hybrid boards is above 0.5 and reaches higher values at some different frequencies. The thermogravimetric analysis for both SFSF and WMS shows that they are thermally stable up to 261 °C and 270 °C, respectively. The three-point bending moment test was also performed to test the mechanical properties of the bound and hybrid sample boards. It should be mentioned that using such waste materials as new sources of thermal insulation and sound absorption materials in buildings and other applications would lead the world to utilize the waste until zero agrowaste is reached, which will lower the environmental impact.
菠萝叶纤维（PALF）、条纹向日葵籽纤维（SFSF）和西瓜籽（WMS）被视为天然废弃聚合物材料，它们可生物降解且可持续。本研究提出了使用此类废弃物作为原材料的新型隔热和吸声材料。PALF、SFSF和WMS被用作具有不同成分的松散、粘结和混合样品，以开发有前景的隔热和吸声材料。制备了11个样品板：3个是松散的，3个是粘结的，5个是PALF与SFSF或WMS之间的混合样品。木材粘合剂被用作粘结和混合样品板的粘合剂。制备了尺寸为30 cm×30 cm、厚度可变的实验室规模样品板。结果表明，在20 - 80°C温度范围内，松散样品的平均导热系数对于PALF、SFSF和WMS分别为0.04694 W/(m·K)、0.05611 W/(m·K)和0.05976 W/(m·K)。粘结样品板的平均导热系数对于PALF、SFSF和WMS分别为0.06344 W/(m·K)、0.07113 W/(m·K)和0.08344 W/(m·K)。PALF和SFSF之间的混合样品对于两种不同成分的平均导热系数分别为0.05921 W/(m·K)和0.06845 W/(m·K)。PALF和WMS之间的另一种混合样品对于两种不同成分的平均导热系数分别为0.06577 W/(m·K)和0.07007。大多数粘结和混合板的吸声系数高于0.5，并且在一些不同频率下达到更高值。对SFSF和WMS的热重分析表明，它们分别在高达261°C和270°C时热稳定。还进行了三点弯曲试验以测试粘结和混合样品板的力学性能。应该提到的是，在建筑物和其他应用中使用此类废弃物作为隔热和吸声材料的新来源将引领世界利用废弃物，直到达到零农业废弃物，这将降低对环境的影响。
