Thermoreversible Gelation of Poly(ether ether ketone).
Thermoreversible Gelation of Poly(ether ether ketone).
复制标题
聚醚醚酮的热可逆凝胶化。
DOI：
10.1021/acsmacrolett.7b00109
复制
发表时间：
2017
影响因子：
7.015
通讯作者：
R. Moore
中科院分区：
文献类型：
--
作者：
S. Talley;X. Yuan;R. Moore
聚（醚醚酮）在二氯乙酸中的溶液已显示在10至140 °C的温度范围内形成整体的热可逆凝胶。在较宽的浓度和温度范围内构建了相图，相边界表明了上临界溶解温度（UCST）行为。此外，聚（醚醚酮）（PEEK）凝胶与水进行溶剂交换，形成水凝胶，随后冻干形成PEEK气凝胶。密度为0.2 g/mL的PEEK气凝胶被认为是高度多孔的，并且由均匀的200 nm形态特征组成。发现PEEK水凝胶和气凝胶的晶体结构与熔融结晶的PEEK的晶体结构相同。PEEK气凝胶的机械性能（压缩）被发现是上级的常规硅酸盐气凝胶的密度相当。该报告是PEEK的单片热可逆凝胶的第一个例子，也是PEEK水凝胶和气凝胶的第一个演示。
Solutions of poly(ether ether ketone) in dichloroacetic acid have been shown to form monolithic, thermoreversible gels at temperatures ranging from 10 to 140 °C. A phase diagram was constructed over broad concentration and temperature ranges, and the phase boundary suggests an upper critical solution temperature (UCST) behavior. Furthermore, poly(ether ether ketone) (PEEK) gels were solvent-exchanged with water to form hydrogels and subsequently lyophilized to form PEEK aerogels. The PEEK aerogels of density 0.2 g/mL were found to be highly porous and composed of uniform 200 nm morphological features. The crystal structure of the PEEK hydrogels and aerogels was found to be identical to that of melt-crystallized PEEK. The mechanical properties of the PEEK aerogels (in compression) were found to be superior to conventional silicate aerogels of comparable density. This report is the first example of a monolithic, thermoreversible gel of PEEK and the first demonstration of PEEK hydrogels and aerogels.