Static and dynamic mechanical properties of modified bismaleimide and cyanate ester interpenetrating polymer networks

Abstract

ABSTRACT:Interpenetrating polymer networks (IPNs) based on different ratios of modified bismaleimide (BMI) resin [BMI/2,2Ј-diallylbisphenol A (DBA)] and cyanate ester (CE) (b10) have been synthesized via prepolymerization followed by thermal curing. A systematic study of both static and dynamic mechanical properties of the cured BMI/ DBA-CE IPN resin systems was conducted through flexural, impact testing, and dynamic mechanical analysis (DMA). The static mechanical investigation shows that the flexural strength, flexural strain at break, and impact strength of the cured BMI/DBA-CE IPN resin systems are relatively lower than that calculated by rule of mixture of two individuals: BMI/DBA and b10. However, the flexural moduli of the IPN resin systems have more consistent features compared to that calculated by rule of mixture. Single damping peaks are detected for the cured BMI/DBA-CE IPN resin systems, which suggests a substantial degree of interpenetration between two networks. The damping peaks of the cured BMI/ DBA-CE IPN resin systems do tend to become broader with increasing concentration of BMI/DBA, whereas the intensity of damping peaks of the IPN resin systems decreases. The obtained results not only provide insight information about the characteristic structures of these BMI/DBA--CE IPN resin systems, but also give guidelines for their applications.

Novel high‐performance wave‐transparent aluminum phosphate/cyanate ester composites

“…Similar phenomena also appear in other polymers and polymeric composites. [25][26][27][28] When a composite has very small content of AlPO 4 (KH-550) (up to 5 wt %), its two T g values are similar with the single T g value of CE resin; while when a composite has somewhat large content of AlPO 4 (KH-550), its two T g values tend to shift toward lower temperature range. The phenomenon can be mainly interpreted by two facts that the addition of AlPO 4 (KH-550) to CE resin changes the curing reaction and thus the cured structure.…”

“…The shape of tan d peak may be used as a convenient indicator of the morphology state of the phases within multiphase materials. 25 The broadness of a relaxation indicates the complexity of the morphology of a material. AlPO 4 (KH-550)/CE composites indeed tends to have wider tan d peak than CE resin, indicating that AlPO 4 (KH-550)/CE composites have more complex morphology than CE resin.…”

“…Dielectric properties were measured using a S914 dielectric loss (DL) test device with a QBG-3DQ instrument in the temperature of 25 C and a frequency of 10 MHz. HIGH-PERFORMANCE WAVE-TRANSPARENT ALPO 4 /CEDynamic mechanical analysis (DMA) scans were performed using TA DMA Q800 apparatus from TA Instruments (USA).…”

High glass transition temperature bismaleimide‐triazine resins based on soluble amorphous bismaleimide monomer

“…[8][9][10] Expanding agent or co-cured materials such as 2,2 0 -diallylbisphenol A are frequently used to modify BT resins. [11][12][13] The allyl group could react with the double bond of bismaleimide by Ene/Diels-Alder reaction 14,15 and the phenolic hydroxyl group could promote the polymerization of the cyanate ester, 16,17 which make the prepolymer of BT resins dissolve in acetone or keep as viscous fluids at room temperature. However, this approach may decrease the T g of the cured BT resins because the allylic compounds usually form soft groups which are unstable to heat.…”

UV curing of a liquid based bismaleimide-containing polymer system

“…These two drawbacks are due to the high density of crosslink and high crystalline content. Many investigations have been done or are focused on improving its properties in order to increase the application [1][2][3][4][5][6][7]. Other papers have shown the cure mechanism and kinetics for BMI and modified BMI systems during thermal curing [2,[8][9][10].…”