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The Effect of Nonlinear Bisphenol Structures on the Properties of Thermotropic Liquid Crystalline Polyarylates
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DOI：10.11777/j.issn1000-3304.2026.25272.png)
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Abstract
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Thermotropic liquid crystalline polyarylates (TLCPs) are high-performance polymers with unique nematic phases and the regulation of their performance is always an issue of significant interest. The introduction of nonlinear bisphenol monomer is recognized as an effective method, however, the effects of nonlinear chemical structures and linkage on the properties of TLCPs have not been clearly understood. In this study, a series of TLCPs with various nonlinear bisphenol monomers were synthesized via one-step melt polycondensation. The melting and crystallization behaviors, thermomechanical properties, thermal stability, rheological behavior, and microscopic morphology were investigated. The results indicated that the nonlinear chemical structure disrupted the molecular chain regularity, thereby enabling effective regulation of the crystallization and rheological behavior.The presence of weak bonds in nonlinear bisphenols reduced the thermal stability of the TLCPs. Moreover, the incorporation of nonlinear bisphenol monomers led to an inhomogeneous distribution of rigid and flexible domains in certain TLCPs, which consequently resulted in a two-step decrease in the modulus.
Keywords:
Thermotripic liquid crystalline polyarylate
Nonlinear bisphenol monomer
One-step polycondensation
Molecular chain regularity
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