Betaine-based shape memory polymer and preparation method thereof

A method for preparing a betaine-based shape memory polymer comprising the steps of:

• placing 1 to 50 parts by weight of a monomer A and 1 to 50 parts by weight of a monomer B in a reactor, adding water and stiffing until uniform;
• adding 1 to 20 parts by weight of a monomer C to the reactor, further adding water and stirring uniform;
• and
• adding an initiator to give a mixture and maintaining the mixture at a temperature to obtain the shape memory polymer;
• wherein the monomer A has a general formula of
• wherein R1 is H or CH3, R2 is O or NH, R3 is one selected from the group consisting of CH3, CH2CH3, and CH2CH2CH3, and Y is one selected from the group consisting of COO, SO3, and PO3;
• the monomer B has a general formula of
• wherein R1 is H or CH3;
• the monomer C has a general formula of
• wherein n=1 to 5.