用IR法测定线型间甲酚-甲醛树脂中亚甲基桥的邻-对位比

Determination of Ratio of Ortho-and Para-Methylene Bridge in Linear m-Cresol-Formalde Resin by IR Spectroscopy

线型间甲酚-甲醛树脂中亚甲基桥与羟基的相对位置不同,其性能有很大不同。我们用IR法测定785cm^(-1)和855cm^(-1)处的吸光度——A_(725)和A_(856),用其比值A_(785)/A_(855)测定线型间甲酚-甲醛-树脂中亚甲基桥的邻-对位比。

The performance of the resin is affected by the ratio of ortho-and para-methylene bridge in the linear m--cresol--formaldebyde resin. We can measure the absorbance of the peaks at 785cm^(-1) and 855cm^(-1) (A_(785) and A_(855) by IR. The ratio of orthe-and para--methylene can be determined by A_(785)/A_(855).