Wang Yulei, Cui Kaibin, Fang Baizeng, Wang Fei
Key Laboratory of Special Functional Materials for Ecological Environment and Information, Hebei University of Technology, Ministry of Education, Tianjin 300130, China.
Department of Chemical & Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada.
Nanomaterials (Basel). 2022 Feb 11;12(4):609. doi: 10.3390/nano12040609.
Integration of nanoclay minerals into rigid polyurethane foams (RPUFs) is a cost-effective solution to enhance foam's performance via environmental protection technology. In this work, palygorskite/RPUFs nanocomposites (Pal/RPUFNs) with excellent mechanical properties and thermal stability were prepared via a one-step method, using 4,4'-diphenylmethane diisocyanate and polyether polyol as the starting materials, coupled with Pal modified by silane coupling agent KH570. The effects of the modified Pal on the mechanics, morphology, and thermal properties of the nanocomposites were studied systematically. When the content of the modified Pal was 8 wt% of polyether polyol, the elastic modulus and compressive strength of the Pal/RPUFNs were increased by ca. 131% and 97%, respectively. The scanning electron microscopy images indicated that the addition of the modified Pal significantly decreased the cell diameter of the Pal/RPUFNs. The results of thermogravimetric and derivative thermogravimetry analyses revealed that the addition of the modified Pal increased the thermal weight loss central temperature of the Pal/RPUFNs, showing better thermal stability in comparison with the pure RPUFs. A self-made evaluation device was used to estimate the thermal insulation ability of the Pal/RPUFNs. It was found that the small cell size and uniform cellular structure were keys to improving the thermal insulation performance of the RPUFs. The prepared Pal/RPUFNs are expected to have great potential in the field of building insulation.
将纳米粘土矿物融入硬质聚氨酯泡沫（RPUF）中是一种通过环保技术提高泡沫性能的经济有效解决方案。在这项工作中，以4,4'-二苯基甲烷二异氰酸酯和聚醚多元醇为起始原料，采用一步法制备了具有优异力学性能和热稳定性的坡缕石/RPUF纳米复合材料（Pal/RPUFN），并使用硅烷偶联剂KH570对坡缕石进行改性。系统研究了改性坡缕石对纳米复合材料力学、形态和热性能的影响。当改性坡缕石的含量为聚醚多元醇的8 wt%时，Pal/RPUFN的弹性模量和抗压强度分别提高了约131%和97%。扫描电子显微镜图像表明，添加改性坡缕石显著降低了Pal/RPUFN的泡孔直径。热重分析和微商热重分析结果表明，添加改性坡缕石提高了Pal/RPUFN的热失重中心温度，与纯RPUF相比具有更好的热稳定性。使用自制的评估装置来评估Pal/RPUFN的保温能力。发现小泡孔尺寸和均匀的泡孔结构是提高RPUF保温性能的关键。所制备的Pal/RPUFN有望在建筑保温领域具有巨大潜力。
