Rheological and Thermal Behavior of Recycled PET Modified by PMDA

Abstract:

In this work pyromellitic dianhydride (PMDA) was used as the chain extender to increase the molecular weight of the recycled poly(ethylene terephthalate) (R-PET) and improve the rheological properties of the R-PET. The reaction was performed in a Brabender torque rheometer. The rheological and thermal characterization were performed by means of a fusion index instrument and a differential scanning calorimeter (DSC ) to compare the effectiveness of the chain extending reaction of different percentages of PMDA. The experimental results showed that compared with the unmodified R-PET, the addition of PMDA decreased the melt flow index and increased the viscosity of the R-PET. In addition, increased crystallization temperatures ( ) were observed with the modified R-PET. It was also found that the modified R-PET with the concentration of 1.0wt% PMDA exhibited the lowest MFI.

• Periodical: Advanced Materials Research (Volumes 391-392)
• Pages: 688-691
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.391-392.688
• Online since: December 2011
• Authors: Ming Yi Wang, Zhi Qiang Guo, Bu Yu Lei, Nan Qiao Zhou
• Keywords: Chain Extender, PET, PMDA

References

[1] H. Nata, S. Matsumura: Journal of Applied Polymer Science Vol. 30(1985), pp.3325-3337.

[2] H. Nata, S. Matsumura: Journal of Applied Polymer Science Vol. 32(1986), pp.5193-5202.

[3] L. Incarnato, P. Scarfato, L. Di Maio, D. Acierno: Polymer Vol. 48(2000), pp.6825-6831.

DOI: 10.1016/s0032-3861(00)00032-x

[4] N. Torres, J.J. Roben, B. Boutevin: Journal of Applied Polymer Science Vol. 79(2001), pp.1816-1824.

[5] F. Awaja, F. Daver: Polymer Engineering and Science Vol. 44(2004), pp.1579-1587.