Studies on synthesis and characterization of hydroxyl-terminated polydimethylsiloxane-modified epoxy bismaleimide matrices

Abstract

This work reports the development of hydroxyl-terminated polydimethylsiloxane (HTPDMS)-toughened tetraglycidyl diaminodiphenyl methane (TGDDM) epoxy matrix systems. The siliconized epoxy systems were further modified with various percentages of (5, 10 and 15 wt%) 10-phenyl-phenonoxaphosphine-3,8-di(2-hydroxy-3-(p-male-imidobenzoyloxy)propyl) ester-10-oxide (EPBMI) and cured by diaminodiphenyl sulfone. Thermal, mechanical and morphological properties of the prepared samples were studied by standard methods. In comparison with the unmodified epoxy resin, HTPDMSincorporated TGDDM resin showed increased impact strength with a reduction in tensile strength, flexural strength and glass transition temperature (T g ). But in the case of bismaleimide (BMI; EPBMI)-incorporated epoxy resin, tensile strength, flexural strength and T g showed an increasing trend. However, the introduction of both siloxane and BMI into epoxy influences the mechanical and thermal properties according to their percentage content. The morphology of the silconized and the BMI-modified epoxy systems was also studied by scanning electron microscopy.

Effect of surface-functionalized reduced graphene oxide on mechanical and tribological properties of bismaleimide composites

“…The corresponding mechanisms of the reactions had been discussed by many researches. 40,41 These chemical bonds contributed to the efficient load transfer between matrix and nanollers, and absorbed large amounts of energy to prevent or bridge the growth of micro-crack in matrix effectively. 14 Together with the high surface area of HBPT-RGO, these surface chemical bonds leaded to stronger interfacial interactions with BMI-BA and thus substantially larger inuence on the properties of the neat resin.…”

Microstructure and Properties of SCE‐Al2O3/PES‐MBAE Composite

“…The dielectric loss of the composites increased significantly when the frequency changed from 10 4 to 10 5 Hz. This was because the dielectric loss of the composites mainly came from the conduction loss of polar groups and relaxation loss [22]. The dielectric loss increased slowly at low frequency range, because the dipole steering could completely keep up with the change of the electric field; the energy that was absorbed by dipole could return to electric field and dielectric loss would increase slowly.…”

Novel Bismaleimide Resins Modified by Allyl Compound Containing Liquid Crystalline Structure

“…Thus, many researchers have focused on the study to improve the toughness of BMI resins. [1][2][3][4] Numerous approaches have been developed to improve the toughness of BMI resins, such as the synthesis of novel BMI monomers with tailored molecular structure, [5][6][7][8][9] copolymerization with allyl-terminated copolymers or aromatic diamines, [10][11][12][13][14] blending modification with thermoplastic resins or liquid crystalline compounds, and so on, [15][16][17][18][19] These methods can improve the toughness of BMI resins with a sacrificing of the thermal stability of resultant materials. 20 O,O -diallyl bisphenol A (DABPA) modified BMI resin systems, whose prepolymers have lower softening point and higher solubility, have been developed successfully.…”