聚碳酸酯的高温剪切降解及其稳定化研究

严谨; 苏莉莉; 张明; 吴国章

doi:10.11777/j.issn1000-3304.2017.17114

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聚碳酸酯的高温剪切降解及其稳定化研究

研究论文 | 更新时间：2021-01-26

- 聚碳酸酯的高温剪切降解及其稳定化研究
- Degradation and Stabilization of Polycarbonate during High Temperature Shearing
- 高分子学报 2018年第4期页码：499-506
- 作者机构：
  
  华东理工大学材料科学与工程学院上海市先进聚合物重点实验室上海 200237
- 作者简介：
  
  吴国章, E-mail: wgz@ecust.edu.cn Guo-zhang Wu, E-mail: wgz@ecust.edu.cn
- 基金信息：
  
  国家自然科学基金(51373053)
- DOI：10.11777/j.issn1000-3304.2017.17114
  中图分类号：
- 纸质出版日期：2018-4-20，
  
  收稿日期：2017-4-27，
  
  修回日期：2017-5-5，
扫描看全文
严谨, 苏莉莉, 张明, 吴国章. 聚碳酸酯的高温剪切降解及其稳定化研究[J]. 高分子学报, 2018,(4):499-506.

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.
严谨, 苏莉莉, 张明, 吴国章. 聚碳酸酯的高温剪切降解及其稳定化研究[J]. 高分子学报, 2018,(4):499-506. DOI： 10.11777/j.issn1000-3304.2017.17114.

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.

摘要

借助傅里叶红外光谱和核磁共振氢谱等分析手段研究了双酚A聚碳酸酯（BPA-PC）在高温剪切混炼过程中的热降解行为，考察了不同抗氧剂对提高PC热稳定性的作用，探讨了PC的热降解黄变机理.结果表明，亚磷酸酯抗氧剂通过抑制碳酸酯键的断链反应，能有效提高PC的色泽稳定性.受阻酚抗氧剂上的酚羟基不利于碳酸酯键的热稳定，易导致其发生断链反应，但却有助于异亚丙基键的热稳定化.此外，探讨了不同降解产物对PC色泽的影响，对比发现，酮类降解产物上的羰基共轭结构可能是引发PC黄变的主要发色基团.

Abstract

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 (

H-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.

关键词

聚碳酸酯热降解黄变抗氧剂

Keywords

PolycarbonateThermal degradationYellowingAntioxidant

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