Synthesis And Properties Of Poly (Aryl Bis-phthalazinone Ether Sulfone Ketone)

With the gradual improvement of the level of technological development,our requirements for polymer materials are getting higher and higher.The research and development of new high-performance resins with higher heat resistance levels has become a hot issue of great concern to the scientific and engineering circles.Polymer resins are mainly divided into Polymer resins are mainly divided into thermosetting resins and thermoplastic resins.The existing materials with higher temperature resistance grades are all thermosetting resin-based composite materials,but their processing performance and impact resistance are poor;and the temperature resistance grade of the existing thermoplastic resins with good processing properties cannot meet the requirements,so there is an urgent need to manufacture a thermoplastic resin matrix with a higher temperature resistance class.First,from molecular aspect,4,4'-bis(2'',3''-naphthalene-1''-one)-diphenyl ether(OBDHPZ)has successfully been synthesized.Then,polymer poly(aryl bis-phthalazinone ether sulfone ketone)(PBPESK)has successfully been synthesized by nucelophilic substitution reaction with OBDHPZ,4,4'-difluorodiphenyl sulfone(DFS)and 4,4'-Difluorobenzophenone(DFK)were used as monomers.The M_nof this series of PBPESKs thermoplastic resins are between 3.2x10~4-5.6x10~4and the PDI are between 1.8-2.6.After hydrogen nuclear magnetic resonance spectroscopy and FT-IR,the results show that the structure of the synthesized monomer and polymers are consistent with the design..On the basis of statement above,the performance of copolymer PBPESKs has been studied.The copolymer PBPESKs have good solubility in a variety of aprotic polar solvents,such as N-methyl-2-pyrrolidinone(NMP),chloroform,etc.Solubility was improved with the increase of DFK segment content in the main chain in such solvents as dimethylacetamide(DMAc).And the thermal properties have been characterized through differential scanning calorimetry(DSC)and thermogravimetric analysis(TGA),the results show that T_gs of the copolymers can be controlled between 298-324?.Copolymer PBPESKs have excellent thermal properties.The tensile test of PBPESKs polymer film shows that its tensile strength is between 74-87MPa,Young's modulus is between 1.85-1.92GPa,and the elongation at break is between 12.6-13.9%,they have good mechanical properties.Two series of copolymers PBPESK-O8 and PBPESK-O6(OBDHPZ/BDHPZ=8/2?6/4)have been synthesized by nucelophilic substitution reaction with DFK,DFS,OBDHPZ and Diphenyl-(6,7'-bisazine)-4,4'(3H,3'H)-dione(BDHPZ)as monomers.The M_nof PBPESK-O8s are between 1.98x10~4-3.93x10~4and the PDI are between 2.1-2.9;The M_nof PBPESK-O6s are between 1.26x10~4-3.42x10~4and the PDI are between 2.1-2.3.After hydrogen nuclear magnetic resonance spectroscopy and FT-IR,the results show that the structure of the synthesized polymers are consistent with the design.The results of DSC and TGA show that copolymer PBPESK-O8s and PBPESK-O6s have more excellent thermal performance.The T_gs of the two series of polymers are between310-342°C,which can be adjusted by the ratio of bisphenol-like monomers or the ratio of sulfone to ketone.The solubility test shows that the two series of polymers exhibit good solubility in chloroform,NMP and other solvents at room temperature.The tensile strength,Young's modulus,and elongation at break of the PBPESK-O8s polymer film are 79-89MPa,1.91-2.28GPa,and 11.71-12.83%,respectively.The tensile strength,Young's modulus and elongation at break of PBPESK-O6s series polymer film are 81-92MPa,2.07-2.42GPa,10.12-12.54%,respectively.Based on the research above,poly(aryl bis-phthalazinone ether sulfone ketone)exhibite high thermal properties,satisfactory solubility and excellent mechanical properties.