【摘要】 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——A₇₂₅和A₈₅₆,用其比值A₇₈₅/A₈₅₅测定线型间甲酚-甲醛-树脂中亚甲基桥的邻-对位比。更多还原

【Abstract】 The performance of the resin is affected by the ratio of ortho-and para-methylene bridge inthe linear m--cresol--formaldebyde resin. We can measure the absorbance of the peaks at 785cm^-1and 855cm^-1 (A₇₈₅ and A₈₅₅ by IR. The ratio of orthe-and para--methylene can be determinedby A₇₈₅/A₈₅₅.更多还原