Zhoufeng Wang,Junwei Hu,Bolin Wang,Yingying Liu,Xiubo Long
A series of novel copolyarylates(co-PARs) containing phenol red units in the backbone were synthesized by interfacial polymerization at 10°C from bisphenol A (BPA), phenol red (PR) and diacid chloride monomers. The obtained copolyarylates (co-PARs) are all amorphous, the inherent viscosity ( η inh ) of 0.22–0.62 dl g −1 , and the number- and weight-average molecular weight are 10,200–46,200 and 38,600–203,600, respectively. Adding a small number of PR units to the molecular chains improved the processing fluidity of polyarylates, and the glass transition temperatures ( T g ) decreased from 202.8 to 166.7°C. In addition, the co-PARs have excellent thermal stability with the maximum thermal decomposition temperature of 532.4–545.2°C. The co-PARs show the best mechanical properties (57.6 MPa) when the PR content is 15 mol%. The transmittances of the co-PARs at 400 and 450 nm are 79.2%–97.9% and 87.0%–99.8%, respectively, and the cut-off wavelength is between 320 and 328 nm. The designed and synthesized copolyarylates can be considered as a promising and easy-to-process high-performance engineering plastic.
A series of co-polyarylates containing m -aryl ether units were synthesized from bisphenol A, 1,3-bis(4′-formylchloridephenoxy)benzene and terephthaloyl chloride via interfacial polycondensation in order to improve the processability of the bisphenol A-based polyarylate (U-polymer). The structure and properties of the co-polyarylates were characterized using infrared spectra, differential scanning calorimety, thermogravimetric analyses, wide angle x-ray diffraction and solubility testing, etc. The results show that the introduction of the asymmetry and flexible m -aryl ether units could improve the solubility obviously, but the solubility parameter of the co-polyarylate almost keeps a constant with changing the content of m -aryl ether units. As the content of m -aryl ether unit increases, the crystallization ability of the polyarylate weakens, meanwhile, the melting temperature shifts to low temperature as expected and the melting enthalpy reduces. When the content of the m -aryl ether units is higher than 60 %, the co-polyarylates become amorphous polymers. Moreover, there is almost no reduction of the thermal stability with increasing the content of the m -aryl ether units. In addition, the stability of each chemical bond of the co-polyarylate to thermal decomposition was systematically studied by means of pyrolysis-gas chromatography/mass spectrometry, and the thermal decomposition mechanism of the co-polyarylate was obtained.
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