High-Temperature transformations of aromatic diamines in the Rolivsan matrix

Studies of Formation Mechanism, Structure, and Properties of Network Copolymers Obtained by Cocuring of Rolivsan Thermosetting Resins with Aromatic Diamines

“…Weak absorption at 1801 сm -1 is related to the presence of traces of MA units in the studied samples (Figure 3, spectra 3 and 4). Note that the spectrum of the diamine sample subjected to similar heat treatment (1.3 -ВАРВ) does not include absorption bands in the 1850 -1650 сm -1 region [6]. To summarize, IR spectra of the cured ROL-II-1,3-BAPB (V-VIII) blends with relatively low concentration of amino groups (Figure 3) contain the peaks typical of amide rather than of imide units.…”

“…However, these latent compounds, which are present in IBGs as a peculiar kind of "microreactors," can be activated under the appropriate conditions (e.g., at elevated temperatures and/or after changing acidity of a medium). After activation, they take part in additional reactions of structurization (crosslinking) of supramolecular formations (grains and interlayers) in microheterogeneous network polymer [2,[5][6][7]. Thus, we propose to use certain implications of mechanism of the network formation as a new structure-forming tool for chemical modification of thermosets.…”

“…Thus, we propose to use certain implications of mechanism of the network formation as a new structure-forming tool for chemical modification of thermosets. The method has turned out to be effective in improving physicomechanical, thermal, and other useful properties of thermosets, as was illustrated by the example of thermochemical transformations of ROLs in binary systems containing epoxy resins [2,3,5] and aromatic di-and tetraamines [3,[5][6][7].…”

Thermal and thermomechanical properties of rolivsan unsaturated resins co‐cured with bisphenol A dicyanate

“…Non-catalyzed neat ROLs are rapidly cured at elevated temperatures 6,[9][10][11][12]16,[18][19][20][21][22][23][24][25][26][27][28][29][30]35,[42][43][44][45][46][47][48] or in the presence of acidic catalysts, 6,25 maleic anhydride, 36 bismaleimides, 36 etc. At 140-170 С, unsaturated aromatic ethers and esters incorporated into ROLs undergo threedimensional radical polymerization (TFRP) and yield a densely cross-linked glassy copolymer with a primary polymer network.…”

“…The following polyfunctional compounds were studied as target additives (admixtures inactive in TFRP): epoxy resins, 10,11,37–43 aromatic diamines, 44–47 aromatic tetra‐amines and dianhydrides of aromatic tetracarbon acids 48 . Chemical modification with these compounds improved thermal, strength and adhesive properties of the cured ROLs.…”