Preparation and characterization of a naphthalene-modified poly(aryl ether ketone) and its phase separation morphology with bismaleimide resin

Dayo

J of Applied Polymer Sci

et al. 2020

Novel quinoxaline-based trismaleimide (2,3-di[3-maleimido]phenyl-6-maleimidoquinoxaline, namely TQMI) and its polymer alloys with 3-phenyl-3,4dihydro-2H-1,3-benzoxazine (P-a) were successfully prepared and characterized. Differential scanning calorimetry investigation of TQMI exhibited distinct double exothermic peaks, which implied that the curing behavior of different type of maleimide group was discrepant. The curing temperature of P-a/TQMI prepolymers was lower than that of both neat TQMI and P-a monomer. The temperatures at 5% (T 5) and 10% (T 10) weight loss and the char yield (Y c) of cured TQMI at 800 C reached 513 C, 524 C, and 63.5%, respectively, which were much higher than the record of traditional 4,4 0bismaleimideodiphenylmethane (BMDPM) resin as well as most of other reported bismaleimide resins. Moreover, the addition of TQMI enhanced thermal stability, glass transition temperature (T g), and limiting oxygen index of benzoxazine resin dramatically. Attractively, the T g value of P-a/ TQMI copolymer at 30 wt% TQMI loadings was approximately 20 C higher than that of P-a/BMDPM copolymer owing to the bulky quinoxaline group.

Section: Introductionmentioning

confidence: 99%

Trifunctional quinoxaline‐based maleimide and its polymer alloys with benzoxazine: Synthesis, characterization, and properties

Dayo

J of Applied Polymer Sci

et al. 2020

Polymers for Advanced Techs

“…Some approaches have been explored for improving the toughness of BMI resins, such as synthesis of new curing agents 15 or novel monomers, 16 introducing chain‐extend agent, 17 blending with hyperbranced polymers, 18 incorporating the 1,3,4‐oxadiazole ring, 19 joining diallyl compounds, 20 mixing with other thermoset resin, 21 doping nanoparticles, 22 mingling with rubber, 23 modifying with thermoplastic resins, 24 and so on. However, there exists a trade‐off behavior between toughness and thermal properties, namely, glass transition temperature ( T g ) and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced toughness and thermal properties of bismaleimide resin based on the synergistic effect of reactive amino‐terminal poly(phthalazinone ether nitrile sulfone) and bisallyl bearing diphenol group

Liu

Jia

et al. 2020

Bismaleimide (BMI) resins have poor toughness due to their high crosslink density, which limits their wide development and application. In this study, the amino‐terminated poly(phthalazinone ether nitrile sulfone) (PPENS‐DA) resin was designed and the curing agent of 3,3′‐diallyl‐4,4′‐biphenol (DABP) was synthesized to toughen N,N′‐(4,4′‐diphenylmethane) bismaleimide (BDM) resin. The impact strength, flexural strength and fracture surface structures of the DABP/BDM and PPENS‐DA/DABP/BDM blends were studied. The results showed that the notched impact strength of the blends with 10‐phr PPENS‐DA is 4.98 kJ/m2, which was 36% higher than that of pristine BDM/DABP blend and 200% higher than that of the 2,2′‐diallyl bisphenol A (DABPA) modified BMI resin system. The glass transition temperature (Tg) has been improved from 247 to 269°C for the blend system as evidenced by DMA. Rheological behavior analysis indicated that the blend system has a broad processing window (90‐175°C) with low viscosity of less than 1 Pa·s and low curing activation energy of 67.2 kJ/mol.

“…20 Some commercial toughened BMI resins, such as QY8911-2 and QY9511, have been developed by incorporating polyethersulfone (PES) and polyetherimide (PEI) with reactive end groups, respectively. In comparison with other high-performance thermoplastic resins, the PEI-modified BMI resin can reach the maximum fracture toughness but exhibit relatively lower heat resistance because the glass transition temperature (T g ) of PEI is only 215 C. 21 To obtain a balance between the high heat resistance and the excellent toughness of modified BMI resins, the incorporation of the novel PEI tougheners with high T g is a promising solution. In this paper, a maleic anhydrideterminated PEI resin containing cardo groups (mPEI-C) with the T g of 281 C was used to modify BMI resin as a toughening agent.…”

Section: Introductionmentioning

confidence: 99%

Characterization and properties of high-temperature resistant structure adhesive based on novel toughened bismaleimide resins

High Performance Polymers

Xiong

Ren

et al. 2020

A series of high-temperature resistant structural adhesives were prepared based on the copolymerization of 4,4′-bismaleimidediphenylmethane (BDM) and 2,2′-diallylbisphenol A (DABPA) together with a novel maleimide-capped polyetherimide containing cardo side groups (mPEI-C) as toughening agent. The chemical structure of the adhesives and their cured networks was characterized by Fourier transform infrared (FTIR) spectrometer. Their curing behavior and kinetics were analyzed using differential scanning calorimetry (DSC). The thermal properties, mechanical properties, bonding strength and moisture absorption behavior of the cured products were investigated by thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis (DMA), etc. The modified resin system with mPEI-C exhibit similar curing behavior, and the apparent activation energy ( E a) and reaction order ( n) are equal to around 85.14 kJ/mol and 0.91, respectively. With increasing mPEI-C contends, the thermal stability is improved, the char yield is increased from 26.5% to 37.1%, and the glass transition temperatures have a slight decrease. The maximum flexural strength, impact strength and bonding strength are increased by 28.4%, 93.1% and 44.6%, respectively. The results of hygrothermal aging experiments exhibit the addition of mPEI-C has no obvious influence on the hygroscopicity of the modified resins.