Systematic study on highly efficient Thermal Synergistic Polymerization effect between alicyclic imide moiety and phthalonitrile: Scope, Properties and Mechanism

Copolymerization modification: improving the processability and thermal properties of phthalonitrile resins with novel comonomers

“…Property data were collected for samples after curing. In order to make a direct comparison of sample performance with the CC/3BOCN system, the fabrication procedure of prepolymer blends and the curing cycle procedure were carried out according to a previous report . The cured polymers (A‐37 and A‐55 for THAN/3BOCN system with different ratios; B‐37 and B‐55 for THBN/3BOCN system with different ratios), prepared from THAN/3BOCN and THBN/3BOCN blends with different molar ratios (3:7, 5:5), were characterized using Fourier transform infrared (FTIR) spectroscopy, TGA, dynamic mechanical analysis (DMA), SEM and boiling water absorption.…”

“…Lately, our group found that alicyclic anhydride end‐capped imide compounds (such as CC shown in Scheme ) could also promote the curing reaction of phthalonitrile. After a systematic study, it is known that alicyclic imide moiety and phthalonitrile show significant ‘thermal synergistic polymerization’ (TSP) effect (meaning that the respective homopolymerization of phthalonitrle resins or alicyclic anhydride end‐capped imide compounds is extremely sluggish, but the polymerization rates can be accelerated obviously when they are mixed together at a rational ratio), and the polymerization of nitrile groups in this new curing system was likely to be initiated with free radical addition mechanism . In addition, the cured phthalonitrle resins exhibit comparable excellent mechanical and thermal properties relative to the traditional phthalonitrile polymers.…”

The curing behavior and properties of phthalonitrile resins using ionic liquids as a new class of curing agents

“…But when the temperature was higher than 500°C, the Resin-2 decomposed faster than Resin-1 and they finally had char yield of 21.3 and 44.1% respectively, which might due to the higher content of ILs in Resin-2. In a word, the data of TGA shows that the thermal and thermos-oxidative stability of 3BOCN/[EPy]BF 4 system are excellent and rank the highest value compared with other curing system [13,18,19]. DMA were performed on Resin-1 and Resin-2 in N 2 atmosphere.…”

“…To date, lots of Lewis acids/bases curing agent, such as metallic salts, strong organic acids, strong organic acids/amine salts and active hydrogen-containing heterocyclic structures have been developed and used [8][9][10][11][12][13][14][15][16][17]. In addition to the traditional Lewis acids/bases, our laboratory also reported the cooperative curing effect between phthalonitrile and methyl tetrahydrophthalic anhydride end-capped imide compound (MODA) [18,19]. To find more kinds of efficient curing agents, we have done a lot of work.…”

Novel benzimidazole-mediated phthalonitrile/epoxy binary blends system with synergistic curing behavior and outstanding thermal properties

“…The complete consumption of nitrile group, which may be induced by the formation of isoindoline other than triazine ring, was rarely reported before. 14,16,20,21 The complete consumption of nitrile group inspired us to study the preparation and the properties of PNBI/epoxy resins. In addition, whether the entire curing process can be controlled within 210 C is a challenge worthy of study.…”