Morphological and mechanical study of nanostructured epoxy systems modified with amphiphilic poly(ethylene oxide-b-propylene oxide-b-ethylene oxide)triblock copolymer

Effect of clay and PEO-PPO-PEO block copolymer on the microstructure and properties of cyanate ester/epoxy composite

“…Increases of approximately 17.6 % and 23.5% were observed in impact toughness by adding 5 wt% and 10% F68, respectively. Previous work has demonstrated the incorporation into the crosslink network of soft PEO chains, which, to some extent, are able to plasticise the thermosetting-rich phase and consequently increase ductility [16]. Moreover, it can be noticed that for the systems with 5 wt % F68, the microphase separated PPO blocks are nanoscale sized in diameter (40-50nm) in Fig.…”

“…The catalytic role of F68 in the curing reaction can be endowed to hydroxyl groups in F68, which has 7 been demonstrated to have catalytic effect on the curing of BCE/EP resins [14]. The results differ from the results of other workers [15] because PEO delays the epoxy-amine reaction by both acting as a diluent and interfering with the autocatalytic process [16]. The observed higher Tp1 for nanocomposites containing clay may be due to polymer molecules moved into the intergallery spacing of the clay layers; hence, a higher reaction temperature was required to initiate the polymerisation and crosslinking of the polymer molecules within the clay layers.…”

“…Fig. 15 3.4 SEM analysis 16 The fracture surfaces of the nanocomposites were observed using SEM. Fig.…”

Nanostructured thermosets containing π-conjugated polymer nanophases: Morphology, dielectric and thermal conductive properties

“…The nanophases are not formed until the curing reaction occurs with the sufficiently high conversion of the precursors. In the past decade, there have been a great number of reports on the preparation of the nanostructured thermosets by using a variety of block copolymers via self-assembly or RIMPS approach [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. It is realized that thermosets can be significantly toughened via the formation of the nanostructures; the mechanisms of toughness improvement are attributable to the debonding of micelles (or vesicles) from thermosetting matrix, crack deflection or frictional interlocking in the thermosets displaying the terraced morphology [22].…”

The molecular structure control of butyl methacrylate/acrylamide (co)polymers

“…The theoretical glass transition temperature of the BMA/AM (co)polymer can be calculated by the Fox Equation as the following [37]:…”