End-Group Method for Molecular Weight Determination of PET Depolymerization under Microwave Irradiation

Abstract:

A series of catalysis hydrolytic depolymerization of PET catalyzed by zinc acetate, zinc sulfate, stannous oxide respectively under microwave irradiation at different temperature with time was studied, in which the microwave power was 260W, the ratio of water to PET was 10:1 and the dosage of the catalysts was 0.5% of PET. The relative number average molecular weight of the undepolymerized PET was determined by end-group method. The results show that the molecular weight of the undepolymerized PET decreases with the reaction time increasing, and tends to be stable at the end of the depolymerization reaction. Under the same time, the temperature is higher, the molecular weight is smaller. The molecular weight of the undepolymerized PET reduces most quickly with stannous oxide among the three catalysts.

• Periodical: Advanced Materials Research (Volumes 554-556)
• Pages: 1933-1937
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.554-556.1933
• Online since: July 2012
• Authors: Qing Hua Feng, Qing Hua Tang, Wei Lu Zhang, Yan Hua Jia, Dong Zhang
• Keywords: Depolymerization, End-Group Method, Microwave, Molecular Weight, PET

References

[1] C.R. Zheng in: Molecular Weight and Distribution of Polymer, Chemical Industry Press, Beijing,1986, p.30 (In Chinese)

[2] S.Z. Zhang in: College of Chemistry and Materials Engineering, Wenzhou University, Master's thesis (In Chinese)

[3] L.X. Liu, et al. : J Appl Poly Sci, 95(2005), p.719

[4] K.X.Li, X.F. Song and D.Zhang: Journal of Applied Polymer Science Vol.109(2008), p.1294

[5] X.F. Song S.Z. Zhang and D.Zhang: Journal of Applied Polymer Science Vol.117(2010), p.3155

[6] N.B. Sanches, M.L. Dias, E.B.A V. Pacheco: Polym Test 24(2005), p.688

[7] S.Fakirov in: Handbook of Thermoplastics, O.Olabisi, Ed, Marcel Dekker Inc,NewYork,1994, p.451

[8] S. A. Jabarin: J Appl Polym Sci 34(1987), p.85

[9] X. Liu, Z. Zhu: Polyester Ind. 3 (1994), p.16(In Chinese)