Neves Anna Carolina Cerqueira, Lopes Felipe Perissé Duarte, Simonassi Noan Tonini, Vieira Carlos Maurício Fontes, Monteiro Sergio Neves
Advanced Materials Laboratory (LAMAV), State University of Northern Rio de Janeiro (UENF), Campos dos Goytacazes 28013-602, Rio de Janeiro, Brazil.
Polymers (Basel). 2022 Dec 17;14(24):5533. doi: 10.3390/polym14245533.
The main objective of this work was to produce and characterize a novel ecofriendly castor oil-based polyurethane (COPU) matrix composite reinforced by Luffa cylindrica mats, luffa for short, to be used as panels, as an alternative to oriented strand board (OSB). To do so, the mechanical behavior was evaluated by tree point flexural, perpendicular o surface tensile, screw pullout, and impact tests that were carried on the novel composite along with the neat matrix. Furthermore, the physical characteristics, the thermomechanical behavior, and the functional groups of the materials were observed by water absorption and thickness swelling tests along with dilatometry and Fourier transform infrared spectroscopy (FTIR). A comparison with commercialized OSB was also performed for control. The luffa/COPU composite was prepared by hand lay-up with 48 vol% of luffa mats incorporated as the maximum allowed by the mold under the available resources for manufacturing. The luffa fibers acted as a good reinforcement for the COPU matrix, where the flexural strength and modulus of elasticity were increased by more than 23 and 10 times, respectively, and the other mechanical properties more than doubled for the composites compared to the neat COPU resin. In general, the composite presented a lower performance compared to the commercial OSB, with the impact results being the exception. The water absorption and thickness swallowing results showed an already-expected behavior for the studied materials, where the better performance was found for the hydrophobic neat resin. The FTIR revealed that there was little interaction between luffa and COPU resin, which can be translated to a weak interface between these materials. However, the mechanical behavior, together with the other results presented by the luffa/COPU composite, confirm it is more than enough to be used as civil construction panels such as OSB.
这项工作的主要目标是制备并表征一种新型的环保型蓖麻油基聚氨酯（COPU）基复合材料，该材料由丝瓜垫（简称丝瓜）增强，用作面板，作为定向刨花板（OSB）的替代品。为此，通过三点弯曲、垂直于表面的拉伸、螺钉拔出和冲击试验对新型复合材料及其纯基体进行了力学性能评估。此外，通过吸水和厚度膨胀试验以及热膨胀法和傅里叶变换红外光谱（FTIR）观察了材料的物理特性、热机械行为和官能团。还与商业化的OSB进行了比较以作对照。丝瓜/COPU复合材料采用手糊法制备，在现有制造资源下，丝瓜垫的掺入量为模具允许的最大量48体积%。丝瓜纤维对COPU基体起到了良好的增强作用，与纯COPU树脂相比，复合材料的弯曲强度和弹性模量分别提高了23倍和10倍以上，其他力学性能也提高了一倍以上。总体而言，与商业OSB相比，该复合材料的性能较低，但冲击性能除外。吸水和厚度膨胀结果显示了所研究材料的预期行为，疏水性纯树脂表现出更好的性能。FTIR表明丝瓜与COPU树脂之间的相互作用很小，这意味着这些材料之间的界面较弱。然而，丝瓜/COPU复合材料的力学性能以及其他结果证实，它足以用作如OSB的民用建筑面板。
