Resin, preparation method therefor, resin composition, and molded article

A resin, comprising:

• a unit represented by the following Chemical Formula 1;
• and a unit represented by the following Chemical Formula 2:
• wherein, in Chemical Formulae 1 and 2,
• Ar1 and Ar2 are the same as or different from each other, and are each independently a substituted or unsubstituted polycyclic aryl group having 10 to 30 carbon atoms,
• R1 is hydrogen, deuterium, a halogen group, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted silyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group,
• r1 is an integer of 1 or 2, and when r1 is 2, each R1 is the same as or different from each other,
• X1 to X4, X9 and X10 are the same as or different from each other, and are each independently O or S,
• Z1, Z2 and Z5 are the same as or different from each other, and are each independently a substituted or unsubstituted alkylene group, a substituted or unsubstituted cycloalkylene group, a substituted or unsubstituted arylene group, or a substituted or unsubstituted heteroarylene 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,
• a, b and p are the same as or different from each other, and are each independently an integer from 0 to 6, and when a, b and p are each 2 to 6, each a-group, b-group, and p-group is the same as or different from each other,
• t is an integer from 1 to 6, and when t is 2 to 6, each t-group is the same as or different from each other,
• m and n are the same as each other, and are 0 or 1,
• when m and n are 0, t, r and s are 1, and La is-C(═O)-L-,
• when m and n are 1, t is an integer from 1 to 6, r+s=1, r is 0<r<1, and s is 0<s<1,
• L11 is a substituted or unsubstituted alkylene group, a substituted or unsubstituted cycloalkylene group, or a substituted or unsubstituted arylene group,
• l11 is an integer from 1 to 5, and when l11 is 2 to 5, two or more L11 are the same as or different from each other,
• X11 to X16 are the same as or different from each other, and are each independently O or S,
• Z11 to Z13 are the same as or different from each other, and are each independently a substituted or unsubstituted alkylene group, or a substituted or unsubstituted cycloalkylene group,
• Lb and Lb′ 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,
• a′, b′ and p′ are the same as or different from each other, and are each independently an integer from 0 to 6, and when a′, b′ and p′ are each 2 to 6, each a′-group, b′-group, and c′-group is the same as or different from each other,
• t″ is an integer from 1 to 6, and when t″ is 2 to 6, each t″-group is the same as or different from each other,
• m″ and n″ are the same as each other, and are 0 or 1,
• when m″ and n″ are 0, t″, r′ and s′ are 1, and Lb is-C(═O)-L′-,
• when m″ and n″ are 1, t″ is an integer from 1 to 6, r′+s′ is =1, r′ is 0<r′<1, and s′ 0<s′ <1.