2+] supported PAN fiber catalysts are still unclear since the 2,2'-bipyridine ligands are also anchored onto the catalyst and may interact with the fiber chains to vary its performances.
Hydroxylantine hydrochloride, 2,2'-bipyridine, and ferrous perchlorate were of laboratory grade and purchased from Tianjin Nankai Chemicals, China.
2+] was prepared according to the literature procedure by gradually adding stoichiometric 2,2'-bipyridine ligand to the ferrous perchlorate aqueous solution [19, 20].
On the other hand, the 2,2'-bipyridine ligands could also contact with the fiber chains and/or amidoxime groups to form hydrogen bonds, which may greatly enhance the crosslink in the molecular construction and significantly alter the properties of the fibrous materials.
Nevertheless, the 2,2'-bipyridine ligands of Fe[(bpy).
The hydrogen bonds formed between 2,2'-bipyridine ligands with the fiber chains weakened the activity of the fiber molecular chains and in turn restricted the slippage of molecular chains when experiencing stress, resulting in the lower elongation at break of FeB-AO-PAN.
This indicates that the elongation at break of FeB-AOPAN is highly dependent on the hydrogen bonds between 2,2'-bipyridine ligands and fiber chains, the break of which allows the chains to slip past one another and in turn lead to a higher elongation at break.
These results reveal that the introduction of 2,2'-bipyridine ligands can impart the FeB-AO-PAN with higher [T.
The hydrogen bonds formed between 2,2'-bipyridine ligands with the fiber chains may be destroyed by water molecules penetration to the amorphous regions of FeB-AO-PAN and in turn lead to a decrease in breaking strength .
2+], probably due to the interaction of 2,2'-bipyridine ligands with the fiber chains.