Novel Method for Preparing Auxetic Foam from Closed-Cell Polymer Foam Based on the Steam Penetration and Condensation Process
Novel Method for Preparing Auxetic Foam from Closed-Cell Polymer Foam Based on the Steam Penetration and Condensation Process
复制标题
基于蒸汽渗透和冷凝过程的闭孔聚合物泡沫制备拉胀泡沫的新方法
DOI：
10.1021/acsami.8b02332
复制
发表时间：
2018-07-04
影响因子：
9.5
通讯作者：
Tang, Tao
中科院分区：
文献类型：
--
作者：
Fan, Donglei;Li, Minggang;Tang, Tao
磁性材料是一类具有负泊松比的材料。在此，我们建立了一种基于蒸汽渗透和冷凝（SPC）过程的由闭孔聚合物泡沫制备拉胀泡沫的新方法。使用聚乙烯（PE）闭孔泡沫作为示例，通过SPC工艺处理的泡沫在拉伸和压缩测试期间呈现负泊松比。研究了蒸汽处理温度和时间对负泊松比泡沫转化效率的影响，并对SPC法形成凹腔结构的机理进行了探讨。结果表明，在SPC过程中，细胞内存在足够的水蒸气是负泊松比转化的关键因素。蒸汽冷凝引起的压力差是传统闭孔泡沫向负泊松比泡沫转化的驱动力。此外，SPC工艺用于制造拉胀泡沫的适用性进行了研究，通过用具有闭孔结构的聚氯乙烯泡沫代替PE泡沫或用乙醇蒸汽代替水蒸汽。结果验证了SPC工艺用于从具有闭孔结构的常规泡沫制备拉胀泡沫的普适性。此外，我们探讨了由SPC过程中获得的拉胀泡沫在形状记忆聚合物材料的制造中的潜在应用。
Auxetic materials are a class of materials possessing a negative Poisson's ratio. Here, we established a novel method for preparing auxetic foam from closed-cell polymer foam based on the steam penetration and condensation (SPC) process. Using polyethylene (PE) closed-cell foam as an example, the foams treated by the SPC process presented a negative Poisson's ratio during stretching and compression testing. The effect of steam-treated temperature and time on the conversion efficiency of negativePoisson's ratio foam was investigated, and the mechanism of the SPC method for forming a reentrant structure was discussed. The results indicated that the presence of enough steam within the cells was a critical factor for the negative Poisson's ratio conversion in the SPC process. The pressure difference caused by steam condensation was the driving force for the conversion from conventional closed-cell foam to the negative-Poisson's ratio foam. Furthermore, the applicability of the SPC process for fabricating auxetic foam was studied by replacing PE foam by polyvinyl chloride foam with a closed-cell structure or replacing water steam by ethanol steam. The results verified the universality of the SPC process for fabricating auxetic foams from conventional foams with a closed-cell structure. In addition, we explored the potential application of the obtained auxetic foams by the SPC process in the fabrication of shape-memory polymer materials.