Preparation And Properties Of Vanillin Molecularly Imprinted Polymers And Imprinted Polymers

Molecularly imprinted polymer, as a kind of functional polymer materials, has been widely used in a sea of fields, which has ability of specific recognition to the template molecule. It is known that vanillin is an important flavoring agent that is mainly obtained from the seedpods of the tropical orchid vanilla planifolia. In this paper, based on the advantages of molecular imprinting technology and membrane separation technology, vanillin molecularly imprinted polymer and vanillin molecularly imprinted membrane were successful prepared, respectively, using vanillin as the template. The results indicated that the molecularly imprinted polymers has high recognition properties and prepare the film with good structure and properties at the same time.A series of molecularly imprinted polymer(MIP) were synthesized by precipitation polymerization, suspension polymerization and bulk polymerization using vanillin as the imprinted molecule and methacrylic acid(MAA) as functional monomer, respectively. The interaction between vanillin and MAA of vanillin MIP and the best proportion were studied by UV spectroscopy and fourier transform infrared spectroscopy (FT-IR). In addition, their microstructure was observed by a transmission electron microscopy(TEM) and their adsorption experiments were carried out to investigate the vanillin-binding capacities of polymers. The best preparation methods of vanillin molecularly imprinted polymer was determined.Vanillin molecular imprinting blend membrane was prepared by the method of phase inversion through mixing particle of molecularly imprinted polymer using polysulfone as the film-forming materials. Through the experiment, the condition of preparation for blend membrane was discussed. The microstructure of blend membrane was observed by a scanning electron microscope(SEM). Besides, their binding capacity and selective permeability for vanillin were studied. The experiment which combines the advantages of molecular imprinting technique and membrane technology is of great significance in the separation and detection applications for vanillin.