Effects of Temperature and Concentration on the Determination of PET Viscosity

This work describes the use of experiment planning to investigate the effects of the variables temperature and concentration of the polymer solution on the viscosity test of polyethylene terephthalate (PET). For this, the response surface methodology was based on a central composite rotatable design (CCRD) to optimize the combinations of the analytical conditions. With the analysis of the standard sample of PET with intrinsic viscosity of 0.630 ± 0.008 dL g-1 and 2-chlorophenol solvent, it was observed that the solution flow temperature and PET concentration caused significant effects on the results, while the storage temperature of the solvent was not statistically significant. With the results and the model developed, an industrial solid state polymerization process of PET was evaluated with simulations of the production of 30 tons of PET, demonstrating the importance of controlling the variables to guarantee the performance in quality control laboratories.

本研究阐述了采用实验设计法（experiment planning）探究聚合溶液温度与浓度变量对聚对苯二甲酸乙二酯（polyethylene terephthalate，PET）黏度测试的影响。为此，本研究采用基于中心复合旋转设计（central composite rotatable design，CCRD）的响应面法（response surface methodology），以优化分析条件的组合。通过以2-氯苯酚为溶剂，对特性黏度为0.630 ± 0.008 dL·g⁻¹的PET标准样品开展分析，结果表明：溶液流动温度与PET浓度对测试结果存在显著影响，而溶剂的储存温度则无统计学显著性。基于所得实验结果与所构建的模型，本研究对PET工业固相聚合工艺进行了模拟评估，模拟生产规模达30吨PET，论证了管控上述变量对保障质量控制实验室检测性能的重要意义。