Study On Preparation And Properties Of Cellulose Grafted Spiral Poly(Phenyl Isocyanide)s Polymer

Cellulose is itself a unique polymeric product and possesses,several attributes such as a fine cross section,the ability to absorb moisture,high strength and durability,high thermal stability,good biocompatibility,relatively low cost and low density yet good mechanical properties.Introducing functional groups into cellulose molecules through chemical modification is one of the key ways of achieving chemical modification of cellulose.These functional groups can confer new properties to the cellulose without destroying its many desirable intrinsic properties,modification by graft polymerisation provides a means of altering the physical and chemical properties of cellulose and increasing its functionality.In this paper,helical poly(phenyl isocyanide)s(PPI)grafted onto chemically modified cellulose chain via the click chemistry,to give cellulose materials chiral recognition,super-hydrophobicity,self-cleaning,oil-water separation and other functions,the grafting sites on the cellulose molecular chain,the degree of substitution,the length of the helical polyisonitrile molecular chain length on the properties of the cellulose graft copolymer were studied.The specific contents are as follows:(1)We modified the azide group at the C-6 position on the cellulose molecular chain to prepare regioselective cellulose azide Cell-6-N3 firstly,then,the palladium(?)complex of alkyne end group is used as an initiator to initiate the living polymerization of D-menthol modified benzisocyanide monomer to prepare right-handed spiral polybenzyl nitrile with corresponding molecular weight and narrow molecular weight distribution PPI_n,Finally,the spiral PPI_n was grafted onto Cell-6-N₃ via the"azido-alkyne"click chemical reaction,to obtain the spiral polyisonitrile grafted cellulose graft copolymer Cell-6-g-PPI_n.Investigated the effect of the cellulose helical backbone,PPI chain length,and grafting ratio on the resulting chirality of the Cell-g-6-PPI_n.(2)First,we modified the mercapto group on the wood cellulose to prepare the mercapto wood(Wood-SH),and then PFPI was prepared by living polymerization of pentafluorophenol-modified benzisocyanide monomer using the palladium(?)complex of ene end group as initiator.the PFPI_n was grafted onto Wood-SH via the"thiol-ene"click chemical reaction(Wood-g-PFPI),the properties of Wood-g-PFPI super hydrophobicity,self-cleaning and oil-water separation were studied,and the effects of PFPI molecular chain length and different grafting times on Wood-g-PFPI super hydrophobicity were studied.In this paper,the spiral polymer is grafted onto the cellulose skeleton by a click chemical reaction,which provides a new and convenient method for designing functional material based on cellulose.This method can be extended to the modification of natural polymer materials.