Left-handed Helical Organopolymeric Nanotubes Created Using The Self-assemblies Of N-Palmitoyl Gluocosamine As The Template

Helical nanomaterials have been extensively studied because of their intrinsic structures and properties.However,up to date,the preparation of helical nanomaterials is still limited in the aspects of theory and technique.Supramolecular templating method is considered to be one of the most important ways to prepare helical nanomaterials,and different kinds of single-handed helical inorganopolymeric nanostructures have been synthesized using the assemblies of glucose derivatives as the template.However,the creation of helical organopolymeric nanomaterials have not been reported.In the first part of this work,a neutral compound derived from D-glucosamine has been synthesized.Its self-assembly behavior was also studied.Using the self-assemblies of this D-glucosamine derivative as the template,left-handed helical m-aminophenol-formaldehyde resin?M-PR?,m-phenylenediamine-formaldehyde resin?M-PDR?and poly?m-phenylenediamine??M-PM?nanotubes have been prepared successfully via a supramolecular templating approach.The research results show that:?1?The formation of helical structures is driven by inter-molecular hydrogen bonds,hydrophobic associative reactions and entropy increasing.?2?Circular dichroism analysis indicates that all the above helical nanotubes possess optical activity.?3?After carbonization,the M-PR derived carbonaceous nanotubes maintain the original helical structure.?4?The M-PDR nanotubes exhibit a removal?26mg/g?of Cr???from K₂Cr₂O₇)aqueous solution,which might be owe to the large number of amino groups in the backbone.?5?The M-PM nanotubes are conductive organopolymer.In the second part of this work,in-situ nitrogen-doped carbonaceous nanomaterials with different structures and nitrogen content have been obtained after the pyrolysis of M-PR and M-PDR helical nanotubes.They have been used as anode material for lithium-ion batteries.The research results show that:?1?The straight or helical morphology shows nearly none effect on the capacity for the carbonaceous nanotubes with similar nitrogen content.?2?The higher the nitrogen content is,the greater capacity the carbonaceous nanomaterials show.?3?For the helical carbonaceous nanotubes?nitrogen content of 9.5 wt%?,a capacity value of 400 mA h/g was obtained after 300 cycles at the current rate of 0.37 A/g with a coulombic efficiency greater 99%,which is superior than that of commercial graphite anode.