Thermal crosslinking polymerization of aromatic alkynyl monomers to microporous polyimides in diphenyl sulfone

Wang, Tianjiao; Yang, Yanchao; Song, Ningning; Zhu, Shiyang; Yao, Hongyan; Zhang, Yunhe; Guan, Shaokang

doi:10.1016/j.micromeso.2021.111447

Cited by 3 publications

(1 citation statement)

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“…Aromatic polyimide materials such as films, fibers, engineering plastic, matrix resins and coatings, due to their excellent combined thermal, mechanical and electrical properties [ 1 , 2 ], have been extensively used in many high-tech industries such as aerospace and aviation [ 3 , 4 , 5 ], microelectronics [ 6 , 7 , 8 ] and opto-electric display [ 9 , 10 , 11 ], etc. Aromatic polyimide could be divided into thermosetting and thermoplastic resins, of which the thermosetting polyimide resins have been extensively employed to produce carbon (or quartz) fiber reinforced polyimide composite components for 300–450 °C applications in aeronautics and astronautics [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Improved Melt Processabilities of Thermosetting Polyimide Matrix Resins for High Temperature Carbon Fiber Composite Applications

et al. 2022

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With the goal of improving processability of imide oligomers and achieving of high temperature carbon fiber composite, a series of Thermosetting Matrix Resin solutions (TMR) were prepared by polycondensation of aromatic diamine (3,4′-oxybisbenzenamine, 3,4-ODA) and diester of biphenylene diacid (BPDE) using monoester of 4-phenylethynylphthalic acid (PEPE) as end-capping agent in ethyl alcohol as solvent to afford phenylethynyl-endcapped poly(amic ester) resins with calculated molecular weight (Calc’d Mw) of 1500–10,000. Meanwhile, a series of reactive diluent solutions (RDm) with Calc’d Mw of 600–2100 were also prepared derived from aromatic diamine (4,4′-oxybisbenzenamine, 4,4-ODA), diester of asymmetrical biphenylene diacid (α-BPDE) and monoester of 4-phenylethynylphthalic acid (PEPE) in ethyl alcohol. Then, the TMR solution was mixed with the RDm solution at different weight ratios to afford a series of A-staged thermosetting blend resin (TMR/RDm) solutions for carbon fiber composites. Experimental results demonstrated that the thermosetting blend resins exhibited improved melt processability and excellent thermal stability. After being thermally treated at 200 °C/1 h, the B-staged TMR/RDm showed very low melt viscosities and wider processing window. The minimum melt viscosities of ≤50 Pa·s was measured at ≤368 °C and the temperature scale at melt viscosities of ≤100 Pa·s were detected at 310–390 °C, respectively. The thermally cured neat resins at 380 °C/2 h showed a great combination of mechanical and thermal properties, including tensile strength of 84.0 MPa, elongation at breakage of 4.1%, and glass transition temperature (Tg) of 423 °C, successively. The carbon fiber reinforced polyimide composite processed by autoclave technique exhibited excellent mechanical properties both at room temperature and 370 °C. This study paved the way for the development of high-temperature resistant carbon fiber resin composites for use in complicated aeronautical structures.

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