Research Progress of Synthesis,Structure,and Performance of Main-chain Liquid Crystalline Aromatic Polyesteramides
Main-chain liquid crystalline polymer(MCLCPs)possess excellent performance due to its readily orientable molecular chain,making it irreplaceable in fields such as aerospace and electronics.Specifically,aromatic polyesteramides(APEAs)address the issues of processing at high temperatures required by both single aromatic polyesters and aromatic polyamides,the excessive rigidity caused by hydrogen bonding between characteristic groups of aromatic polyamides,and susceptibility to water absorption.However,despite the plethora of studies on APEAs'molecular chain structures and synthesis methods,there remains a lack of systematic overview.Based on the order of ester and amide bond formation,the synthesis is categorized into two distinct approaches:one-step condensation method that simultaneously generates bonds,resulting in random chain structures;and two-step condensation method that sequentially produces bonds,yielding ordered sequences.Moreover,the suitability of various monomer structures affects the polymerization methods and conditions,and hence,an assessment of the factors influencing the polymerization reaction is presented.Building upon this foundation,the relationship between main-chain structure and properties is comprehensively reviewed,and future development directions are proposed to provide guidance and references for the synthesis of novel APEAs.
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