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Highly Ordered Nanocellular Polymeric Foams Generated by UV-Induced Chemical Foaming
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-09-17 , DOI: 10.1021/acsmacrolett.0c00475
Podchara Rattanakawin 1 , Kenji Yoshimoto 1 , Yuta Hikima 1 , Alvin Chandra 2 , Teruaki Hayakawa 2 , Masatoshi Tosaka 3 , Shigeru Yamago 3 , Masahiro Ohshima 1
Affiliation  

Nanocellular polymer foams have shown significant potential for industrial applications because of their superior thermal, mechanical, and optical properties. Some of these properties may be further improved by enhancing the ordering of cell structures. However, it is challenging for conventional foaming methods to control both the cell size and ordering at the nanoscale. Here, we show an innovative method to produce highly ordered nanocellular polymer foams by incorporating the self-assembly of an asymmetric diblock copolymer with the UV-induced chemical foaming technique. The minor domains are designed to generate a gaseous compound from the partial cleavage of the functional group. It is demonstrated that the gas-producing reaction can be accelerated at a temperature low enough to prevent melting of the whole self-assembled template, by mixing a small amount of photoacid generator into the copolymer, followed by UV irradiation. The result is the production of polymer foams with the nanoscale cells highly aligned to the self-assembled domains.

中文翻译:

紫外线诱导化学发泡产生的高度有序的纳米多孔聚合物泡沫

纳米孔聚合物泡沫由于其优异的热,机械和光学性能而显示出了工业应用的巨大潜力。通过增强细胞结构的有序性,可以进一步改善其中一些特性。然而,对于常规发泡方法而言,在纳米尺度上控制泡孔尺寸和有序性是具有挑战性的。在这里,我们展示了一种创新的方法,通过将不对称二嵌段共聚物的自组装与紫外线诱导的化学发泡技术结合在一起,可以生产出高度有序的纳米孔聚合物泡沫。次要结构域被设计为从官能团的部分裂解产生气态化合物。已经证明,可以在足够低的温度下促进产气反应,以防止整个自组装模板熔化,通过将少量光酸产生剂混合到共聚物中,然后进行紫外线照射。结果是生产的聚合物泡沫具有高度对准自组装域的纳米级孔。
更新日期:2020-10-21
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