Stable Solution of the Polymer Prepared from N,O-Heterocycles and its Preparation Method and Use

A method for providing a stable solution of polymer prepared from an N,O-heterocyclic compound, comprising:

• (a) dissolving an N,O-heterocyclic compound of formula I or formula II into a first solvent to form a first reaction solution:
• wherein,
• R1 to R3 are independently selected from the group consisting of H, a halogen, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C1-C10 cycloalkyl group, and a substituted or unsubstituted C6-C20 aryl group;
• W1 and W2 are independently selected from the group consisting of H, a halogen, an ether group, a thioether group, a sulfonyl group, a sulfinyl group, a carbonyl group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C1-C10 cycloalkyl group and a substituted or unsubstituted C6-C20 aryl group;
• m and n are independently an integer ranging from 1 to 4;
• p is an integer ranging from 1 to 3;
• and
• q is an integer ranging from 1 to 4;
• (b) heating the first reaction solution to a first temperature to carry out a ring-opening polymerization;
• and
• (c) cooling the first reaction solution to a second temperature to substantially terminate the ring-opening polymerization,
• wherein, the first solvent is unreactive to the N,O-heterocyclic compound;
• the first temperature is higher than the softening point of the N,O-heterocyclic compound and lower than the boiling point of the first solvent;
• and the second temperature is lower than the first temperature.