Method of analyzing copolycarbonate

A method of analyzing a copolycarbonate, the method comprising:

• reacting the copolycarbonate including a first repeating unit derived from an aromatic diol compound and a second repeating unit derived from a polysiloxane-containing aromatic diol compound with methanol to decompose the copolycarbonate into the aromatic diol compound and the polysiloxane-containing aromatic diol compound;
• and
• performing gel permeation chromatography (GPC) of the decomposed polysiloxane-containing aromatic diol compound after the reacting step without a separate extraction and/or purification process,
• wherein the step of reacting the copolycarbonate with methanol includes the steps of dissolving an alkali salt in methanol to prepare an alkali hydroxide solution;
• and reacting the prepared alkali hydroxide solution with the copolycarbonate to perform an alkali-catalyzed alcoholysis reaction,
• wherein the alkali-catalyzed alcoholysis reaction is performed at 40° C. to 70° C., and
• wherein the step of performing GPC of the decomposed polysiloxane-containing aromatic diol compound is performed by quenching a decomposition product including the decomposed polysiloxane-containing aromatic diol compound using liquid nitrogen and then diluting the product, followed by GPC.