Resin and Preparation Method Therefor

A resin comprising a unit represented by Chemical Formula 1:

• in Chemical Formula 1,
• X1 to X6 are the same as or different from each other, and are each independently O or S,
• R1 and R3 are the same as or different from each other, and are each independently a phenyl group which is substituted with a cyano group, or a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted aryl group having 10 or more carbon atoms;
• a substituted or unsubstituted condensed ring group of an aromatic hydrocarbon ring and an aliphatic hydrocarbon ring;
• or a substituted or unsubstituted heteroaryl group,
• R2 and R4 are the same as or different from each other, and are each independently hydrogen;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted cycloalkyl group;
• a substituted or unsubstituted aryl group;
• a substituted or unsubstituted condensed ring group of an aromatic hydrocarbon ring and an aliphatic hydrocarbon ring;
• or a substituted or unsubstituted heteroaryl group,
• R5 to R7 are the same as or different from each other, and are each independently a direct bond;
• a substituted or unsubstituted alkylene group;
• or a substituted or unsubstituted cycloalkylene group,
• R11 and R12 are the same as or different from each other, and are each independently a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted cycloalkyl group;
• a substituted or unsubstituted aryl group;
• or a substituted or unsubstituted heteroaryl group, or are bonded to each other and together with the carbon atom to which they are attached to form a substituted or unsubstituted aromatic hydrocarbon ring group,
• R101 and R102 are the same as or different from each other, and are each independently hydrogen;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted cycloalkyl group;
• a substituted or unsubstituted aryl group;
• or a substituted or unsubstituted heteroaryl group,
• La and La′ are the same as or different from each other, and are each independently a direct bond;
• or —C(═O)-L-,
• L is a substituted or unsubstituted arylene group,
• r101 is 1 or 2, and when r101 is 2, each occurrence of R101 is the same as or different from each other,
• r102 is 1 or 2, and when r102 is 2, each occurrence of R102 is the same as or different from each other,
• m, n, and p are the same as or different from each other, and are each independently an integer from 0 to 6,
• when m, n, and p are each 2 or higher, each occurrence of R6-X4, X3-R5, and R7-X6 is the same as or different from each other, respectively,
• t is 0 or 1,
• when t is 0, r and s are 1, and La is —C(═O)-L-,
• when t is 1, r+s=1, r is a real number of 0<r<1 as a mole fraction, and s is a real number of 0<s<1 as a mole fraction, and
• * means a moiety linked to the main chain of the resin.