Citation: Jin Yan, Li-li Su, Ming Zhang, Guo-zhang Wu. Degradation and Stabilization of Polycarbonate during High Temperature Shearing[J]. Acta Polymerica Sinica, ;2018, (4): 499-506. doi: 10.11777/j.issn1000-3304.2017.17114 shu

Degradation and Stabilization of Polycarbonate during High Temperature Shearing

Shanghai Key Laboratory of Advanced Polymeric Material, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237

Corresponding author: Guo-zhang Wu, wgz@ecust.edu.cn
Received Date: 27 April 2017
Revised Date: 5 May 2017

The thermal degradation behavior of bisphenol A polycarbonate (BPA-PC) during high temperature shear mixing was investigated. The effects of different antioxidant systems on improving the thermal stability of PC were compared by using a combination of spectrodensitometer, universal tensile testing machine and Ubbelohde viscometer, while the structural transformation of PC during the degradation process was studied by Fourier transform infrared spectrometer (FTIR) and nuclear magnetic resonance spectroscopy (¹H-NMR) analysis. The results show that the addition of phosphite antioxidant and complex antioxidant can greatly improve the thermal stability and delay the extent of reduction of molecular weight as well as mechanical properties during the degradation process. Phosphite antioxidant can effectively enhance the color stability of PC by inhibiting the scission of carbonate linkage. Hindered phenolic antioxidant has opposite effects on the thermal stabilization of carbonate bonds and isopropylidene bonds in PC molecular chains. The phenolic hydroxyl groups of hindered phenolic antioxidant result in chain scission that is against the thermal stability of carbonate bond. Furthermore, hindered phenolic antioxidant contributes to the thermal stabilization of isopropylidene bond, which is superior to phosphite antioxidant. Multiple hindered phenolic antioxidant appears more outstanding thermostability to isopropylidene bonds, and the combination with phosphite can decrease the degradation of carbonate bond, which results in an excellent antioxidant effect. In addition, the effects of different degradation products on discoloration were discussed. It is found that chromophore is not derived from chains terminated with acetophenone. However, the yellow index of PC is proportional to the relative amount of chains terminated with phenolic hydroxyl, and the degree of color deterioration is also correlated with the infrared peak intensity of aliphatic ketone and aromatic ketone. Therefore, ketones could be the main degradation products that cause PC yellowing, while the carbonyl conjugated structure in the molecular chain is the main chromophore.
- Polycarbonate,
- Thermal degradation,
- Yellowing,
- Antioxidant
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