Park Jinsu, Kwak Seung-Yeop
Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea.
Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea.
Commun Chem. 2022 Oct 7;5(1):119. doi: 10.1038/s42004-022-00740-1.
Multifunctionality and effectiveness of macroporous solid foams in extreme environments have captivated the attention of both academia and industries. The most recent rapid, energy-efficient strategy to manufacture solid foams with directionality is the frontal polymerization (FP) of dicyclopentadiene (DCPD). However, there still remains the need for a time efficient one-pot approach to induce anisotropic macroporosity in DCPD foams. Here we show a rapid production of cellular solids by frontally polymerizing a mixture of DCPD monomer and allyl-functionalized cellulose nanocrystals (ACs). Our results demonstrate a clear correlation between increasing % allylation and AC wt%, and the formed pore architectures. Especially, we show enhanced front velocity (v) and reduced reaction initiation time (t) by introducing an optimal amount of 2 wt% AC. Conclusively, the small- and wide-angle X-ray scattering (SAXS, WAXS) analyses reveal that the incorporation of 2 wt% AC affects the crystal structure of FP-mediated DCPD/AC foams and enhances their oxidation resistance.
大孔固体泡沫材料在极端环境中的多功能性和有效性引起了学术界和工业界的关注。制造具有方向性的固体泡沫材料的最新快速、节能策略是二环戊二烯（DCPD）的前沿聚合（FP）。然而，仍然需要一种省时的一锅法来在DCPD泡沫中诱导各向异性大孔结构。在此，我们展示了通过对DCPD单体和烯丙基官能化纤维素纳米晶体（ACs）的混合物进行前沿聚合来快速生产多孔固体材料。我们的结果表明，烯丙基化百分比和AC重量百分比的增加与所形成的孔结构之间存在明显的相关性。特别是，我们通过引入2 wt%的最佳AC量，展示了提高的前沿速度（v）和缩短的反应引发时间（t）。最后，小角和广角X射线散射（SAXS、WAXS）分析表明，加入2 wt%的AC会影响FP介导的DCPD/AC泡沫的晶体结构，并提高其抗氧化性。
