Microstructure–property relationships of organo-montmorillonite/polyurethane nanocomposites: Influence of hard segment content

Graft copolymerization of acrylic acid on to styrene butadiene rubber (SBR) to improve morphology and mechanical properties of SBR/polyurethane blend

“…The ATR‐IR spectra of the neat SBR, AA and SBR * 100 are illustrated in Figure . The spectrum of the neat SBR showed (a) characteristic bands corresponding to the butadiene segments at 964 cm −1 (trans‐1,4), 1638 cm −1 (stretching vibration of vinyl), 1450 cm −1 (CH 2 scissoring), 3026 cm −1 (CH stretching), 2844 and 2916 cm −1 (CH stretching) . Likewise, vibrations at 698 cm −1 (styrene units), 1602 cm −1 (aromatic CC stretching) and 3066 cm −1 (CH out of plane deformation) were observed for the styrene segments of the neat SBR .…”

“…A two‐step in situ polymerization method was employed to synthesize polyurethane as reported elsewhere . Briefly, a three‐neck flask, equipped with nitrogen inlet and a mechanical stirrer system was used for the reaction of 1 mol poly(tetrahydrofuran) and 2.284 mol HDI (hard segment content = 20%).…”

“…The mixed materials were then heated for 48 h at 80 °C and then kept at the room temperature for a minimum of 30 days before subsequent using. The microstructure‐property relationships of this PU system has been comprehensively analyzed in terms of parameters such as hard segment content, degree of phase separation, crystallinity of soft and hard domains, etc., and can be explored elsewhere …”

Creep response of a LDPE‐based nanocomposite

“…Actually, the very high surface contact area between the two phases allows an easy and efficient transmission of the stress between the two phases, thus enhancing the beneficial effect of the filler. Mechanical properties, [1][2][3][4][5][6][7][8][9] rheological behavior, [10][11][12][13][14][15][16][17][18][19] and permeability [20][21][22][23][24][25] are dramatically influenced even by very small amounts of nanofiller.…”

Effects of biomass diatom frustule on structure and properties of polyurethane elastomer

“…modified PU with talc, and the results showed that the tensile strength of composites was significantly improved by 5‐wt % of talc. Taheri and Sadeghi prepared PU/montmorillonite nanocomposites, and found that montmorillonite can be exfoliated into sheets as a nucleating agent of crystallization of the hard and soft segments, thus impacting hydrogen bonding and microphase separation of PU. Consequently, the tensile modulus of PU was enhanced, while the tensile strength and elongation at break were lowered.…”