摘要
用改进的Renard方法控制合成了 6种不同交联度的水溶性 β 环糊精聚合物 .以 3 羟基 2 萘甲酸为荧光探针 ,考察了聚合物交联度对形成超分子配合物的稳定性及荧光性质的影响 ,发现生成常数和相对荧光强度均随交联度的增长呈上升趋势 ,并发现其相对荧光强度的增量与对应的交联度存在线性关系 .用 β 环糊精聚合物及其与 3 羟基 2 萘甲酸构筑的超分子配合物分别与二甲基硅油配制了电流变液 ,流变学性能测试发现这些聚合物电流变液均有很好的电流变活性 ,其中 ,单纯聚合物电流变液的屈服应力随交联度的增加呈上升趋势 ,而超分子配合物电流变液则表现出更高的电流变活性 ,但当交联度太大时 ,其屈服应力甚至低于对应的聚合物 ,并随交联度的增加呈先增加后降低的趋势 ;介电性能测试发现 。
Six soluble β cyclodextrin polymers were prepared by the modified method of Renard. Using 3 hydroxy 2 naphthoic acid as a fluorescence probe, the relationship of the crosslinking degree (CLD) of the polymer with the stability of supramolecular complex and the fluorescence properties was investigated, respectively. The results showed that the formation constant increased with the enhancement of CLD as well as the relative fluorescence intensity. And also, a straight line relationship was observed between the increment of the relative fluorescence intensity and CLD, indicating that CLD had strong influence on the fluorescence properties. The polymers and their complex particles in silicone oil were investigated under DC electric fields, respectively. It was found that these ER fluids exhibited good ER effects. The yield stress increased with the increase of CLD for the pure β cyclodextrin polymers. The supramolecular complex ER fluids displayed a higher ER effect than the polymer, but the yield stress increased firstly and then decreased with the increase of CLD. This was well confirmed by the measurement of the dielectric properties of these ER fluids.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2004年第4期418-423,共6页
Acta Chimica Sinica
基金
国家自然科学基金 (Nos.59832 0 90
50 2 72 0 54)
国家杰出青年科学基金 (No.50 0 2 52 0 7)资助项目
