Synthesis method of spiro orthoester monomer

Abstract

The invention provides a synthesis method of a spiro orthoester monomer, relating to a polymer synthesis method. The synthesis method comprises the following steps: adding toluene and gamma-butyrolactone in a three-mouth flask; fully dissolving E-54 with toluene, and then dissolving 20.66mL of catalyst BF3.OEt in toluene; after the temperature of the device is cooled to -12 DEG C by cryohydrate bath and a first batch of catalyst is added, dropwise adding a resin toluene solution; adding a terminator triethylamine to terminate the reaction; carrying out post-processing: preparing a NaOH solution, and washing with the NaOH solution; adding magnesium sulfate in the reaction liquid for drying, and then filtering; carrying out distillation at reduced pressure so as to obtain a milkiness thick liquid; and performing vacuum drying so as to obtain the milk-white wax-shaped spiro orthoester monomer. The spiro orthoester monomer is copolymerized with a resin adhesive, which has important significance in the aspects of improving the adhesion effect, preventing the material from aging, reducing the volume contractibility rate during curing, improving the strength of thermosetting resins, prolonging the service life and the like.

Description

A kind of synthetic method of spiro ring ortho ester monomer technical field The invention relates to a method for synthesizing a polymer, in particular to a method for synthesizing a spirocyclic ortho ester monomer. Background technique In August 1974, Bailey, an American scientist, read the paper "Polymerization of Spirocyclic Ether Monomers into Polycarbonate Containing Ether Bonds" at the Japan-US Science Symposium, and first proposed the expansion polymerization reaction. Swelling polymerization refers to a type of polymerization that can produce volume expansion during the polymerization process. It is an important branch of ring-opening polymerization, which is the result of the increase in molecular size caused by cationic or free radical ring-opening polymerization of spirocyclic and bicyclic orthoesters. The monomers capable of this polymerization reaction are usually called expansion monomers. The earliest known expanding monomer was 1,4,6-trioxaspiro[4,4]nona...

AI Technical Summary

Problems solved by technology

Residual stress will also make cemented joints or resin and fiber interfaces susceptible to attack by environmental factors such as oxygen and water, resulting in premature environmental damage

Images