Thermosetting Oligomers Containing Maleimides and Nadimides End-Groups

Structuring and characterization of a novel highly microporous PEI/BMI semi-interpenetrating polymer network

“…5, significant change was observed in two peaks at 3178 and 3268 cm K1 , which were higher for spectra of membrane containing BMI and particularly for PEI-BMI-EtOH (S and L) compared to PEI-EtOH. The increase in these two peaks might be attributed to NH stretching in amide group [4] (Table 4) resulting from hydrolysis and cleavage of imide groups, which have a higher concentration in BMI than PEI ( Table 3). The remaining peaks were similar to the commercial PEI (Ultem 1000) film and had two major weak peaks at 2967.35 and 3067.21 cm K1 in addition to a very weak peak at 3521.9 cm K1 as described elsewhere [24].…”

“…The increase in the intensity of this peak for PEI-BMI-i-PrOH might be attributed to higher imide nitrogen in BMI than that in PEI as seen in Table 3. The formation of succinimide in this membrane might be possible as this peak could be assigned to C-N-C stretching in succinimide structure [4,38]. However, the decrease in the intensity of this peak in spectra of PEI-BMI-EtOH (S and L) might be attributed to imide cleavage.…”

“…Formation of interpenetrating polymer network (IPN) could be one of the most important ways for material development as indicated in vast engineering literature, patents and commercialized products reported since 1951 [3]. Using in situ polymerization and appropriate processing led to a revolutionary success in creating polymeric nano-scale multidomain blends having new extraordinary properties as reviewed elsewhere [4,5]. It was reported that gas transport characteristics correlated with the chemical structure and matrix morphology, might be tailored by controlling the conditions of IPN formation as illustrated elsewhere [6].…”

Synthesis and properties of silicon‐containing bismaleimide resins

“…10,11 BMI resins are an important type of thermoset polymeric materials characterized by their high glass transition temperatures and high modulus. 12,13 However, poor solubility of BMI monomers and BMI resins in common organic solvents and their inherent brittleness limits to a great extent their wide applications. To overcome these problems, effort has been made to develop novel BMI monomers containing flexible units; modification of BMI resins by using comonomers, such as the copolymerization of BMI monomers with diamines via the Michael addition reaction, has also been extensively explored to decrease the crosslinking density.…”

Formation and thermal stability of BMI-based interpenetrating polymers for gas separation membranes

“…Generally, most of the polymers require incorporation of additives to achieve desired characteristics for material performance [4,5]. Interpenetrating polymer networks (IPNs) introduced in the early 1960s, were successful in creating polymeric nano-scale blends having new extraordinary properties as reviewed elsewhere [6,7]. The importance of IPN synthesis has been recognized in engineering literature, patents and commercialized products since 1951 [8,9].…”