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聚对苯二甲酸乙二酯的羧端基含量的变化与分子量、热稳定性、催化剂、聚合条件、干燥条件及大气中日光照射影响等,都有密切关系.其测定方法在器械分析方面有红外线分光光度法,在化学分析方面有以苯甲醇为溶剂、酚红为指示剂,或以苯胺为溶剂、酚酞为指示剂.由于化学法较为简便,故多采用之.但上述二化学法,皆需在高温溶解,往往因热裂解而产生新的羧基,这样就严重地影响了数据的准确性与精确度,不能得
Polyethylene terephthalate carboxyl end groups content changes and molecular weight, thermal stability, catalyst, polymerization conditions, drying conditions and the impact of sunlight in the atmosphere are closely related to the determination of the method in the instrument analysis Infrared spectrophotometry, in the chemical analysis of benzyl alcohol as a solvent, phenol red as an indicator, or aniline as a solvent, phenolphthalein as an indicator. Due to the chemical method is relatively simple, it is often used.But the above two chemical methods, All need to dissolve at high temperature, often due to the thermal cracking of the new carboxyl, thus seriously affecting the accuracy and accuracy of the data can not be