Bismaleimides and biscitraconimides: Synthesis and properties

Self Cite

A series of bismaleimide monomers with amide groups were prepared and characterized. Structurally different bismaleimides (with amide units) were synthesized by a reaction between 4-maleimidobenzoyl chloride and various diamines. The monomers were characterized by infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and elemental analysis. The thermal characterization of the bismaleimides was accomplished with differential scanning calorimetry and dynamic thermogravimetric analysis.

“…Bismaleimide 1 (BMI‐ 1 ), bismaleimide 2 (BMI‐ 2 ), bismaleimide 3 (BMI‐ 3 ), and bismaleimide 4 (BMI‐ 4 ) were synthesized according to the literature 17…”

Section: Methodsmentioning

confidence: 99%

Bismaleimide monomers with amide units: Synthesis and properties

Sava¹

2006

Self Cite

“…Another effective strategy is the modification of BMI's chemical structure. A number of new chain‐extended BMIs have been designed and synthesized, such as those containing amide, ester, naphthalene, phosphorus, silicon, 1,3,4‐oxadiazole, biphenylene, dicyclopentadiene or dipentene, fluorenyl, parabanic, allyl, s‐triazine, phenylindane, azobenzene, epoxy backbone, and metal complex . Based on the structure–properties relationships, the unsymmetrical chemical structure can hinder the ordered packing or crystallization of the molecules, hence improve the solubility of the monomers.…”

Section: Introductionmentioning

confidence: 99%

Soluble asymmetric bismaleimide with low molten viscosity and its high glass transition temperature polymer

Ren

Cheng

et al. 2016

Three novel bismaleimide monomers (MBA-BMI, EBA-BMI, and PBA-BMI) with unsymmetrical backbone and different pendant groups were synthesized using asymmetric diamine and maleic anhydride as the precursors. The prepared bismaleimide monomers show good solubility in common organic solvents such as acetone and tetrahydrofuran. The EBA-BMI melt treated at 180 8C also shows low viscosity about 190-934 mPa s at the temperature range of 160-139 8C below its melting point (166 8C). In addition to the good processability, all three cured bismaleimides show high storage moduli at high temperatures (2.0 GPa at 400 8C), high glass transition temperatures over 400 8C, and good thermal stability with the 5% weight loss temperatures around 470 8C under nitrogen atmosphere.

“…However, the binary BT resins show disadvantageous processability due to the poor solubility and narrow processing temperature window of the commercial BMI such as N , N ′‐(4,4′‐diphenylmethane)bismaleimide (DDM‐BMI). To improve the processability of BT resins, novel BMIs with special groups and structure, such as ester, naphthalene, 1,3,4‐oxadiazole, biphenylene, dicyclopentadiene or dipentene, allyl, s‐triazine, phenylindane, epoxy backbone, phthalide, and 3,3,4,4,5,5‐hexafluoro‐1‐cyclopentene, have been developed. Xia et al .…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of soluble bismaleimide‐triazine resins based on asymmetric bismaleimide

Ren

Cheng

et al. 2016

A series of bismaleimide-triazine resins (EBT) were prepared from 2-(4 0 -maleimido)phenyl-2-(4 0 -maleimidophenoxyl)phenylbutane (EBA-BMI) and 2,2-bis(4-cyanatophenyl)propane (BADCy). The resins show attractive processability with good solubility in low boiling point solvents and wide processing temperature windows. Introduction of diallylbisphenol A (DBA) can decrease the curing temperature of EBT resins that the curing exothermic peak temperature shifted from 291 to 237 8C as the content of DBA increased from 0 to 20%. The curing condition influenced the thermal properties of the cured EBT resins. The glass transition temperature increased as the curing temperature and curing time increased. The cured EBT resins show high glass transition temperature up to 352 8C, high thermal stability with 5% weight loss temperature over 405 8C, low coefficient of thermal expansion about 45 to 52 ppm/8C, and high storage modulus up to 2.6 GPa at 250 8C.