Patent ID: 11921068
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for measuring a molecular weight, the method comprising:
mixing a sample into a solvent to fabricate a sample liquid, wherein the sample liquid is formed of a polyester or decomposition products of a polyester, wherein the solvent comprises chloroform and 2,2,2-trifluoroethanol, and wherein the solvent has an organic base added thereto;
measuring an amount of terephthalic acid terminals and an amount of hydroxy group terminals in the sample liquid through a nuclear magnetic resonance spectroscopy aiming at hydrogen atoms; and
of calculating a number average molecular weight of the sample liquid from the amount of terephthalic acid terminals and the amount of hydroxy group terminals in the sample liquid.