Mesoporous graphene with a surface area of 306 m2 g−1 was synthesized by employing CaCO3 microspheres as hard templates. By surface modification with polydimethylsiloxane (PDMS) through chemical vapor deposition, the wettability of as‐treated mesoporous graphene can be tailored to be superhydrophobic to water while superoleophilic to oils. The deposition of the low‐surface‐energy silicon‐coating originated from PDMS pyrolysis on porous graphene was confirmed by X‐ray photoelectron spectroscopy. As a result of its porous structures and excellent surface superhydrophobicity, the PDMS‐treated mesoporous graphene exhibits good selectivity, excellent recyclability, and good absorption performance (up to 66 g g−1) for a wide range of oils and organic solvents. Thus, leading to potential use in a variety of applications such as water treatment and purification as well as cleanup of oil spills.
Novel polyacrylamide/graphite oxide (PAM/GO) superabsorbent nanocomposites were synthesized by a simple solution polymerization of acrylamide using N,N 0 -methylenebisacrylamide as crosslinker and ammonium persulfate as initiator. The well dispersion of GO nanoplatelets in the polymeric network results in a remarkable improvement on the comprehensive swelling performance of the resulting superabsorbent nanocomposites. The water absorption experimental results show that the superabsorbent nanocomposites could absorb water as twice as that of crosslinked polyacrylamide (PAM) superabsorbent with a weight gain of 400 g g À1 with a low loading of GO. The salt tolerance and water-retention ability of the resulting PAM/GO superabsorbent nanocomposites are also enhanced compared with PAM. Moreover, by embedding of ammonium salt into PAM/GO network, the PAM/GO superabsorbent nanocomposites also exhibit a slow release behavior of ammonium salt from network when swelling in water, which makes the PAM/ GO superabsorbent nanocomposites multifunctional absorbent materials with great potential for agricultural and horticultural applications.
Melamine resin microcapsules encapsulating liquid paraffin as core materials are synthesized. By using melt blending method, different ratios of microcapsules and modified potassium titanate whiskers (PTWs) are added to poly(butylene terephthalate) (PBT) matrix to fabricate the binary and ternary PBT composites. The effect of oil-loaded microcapsules content on mechanical properties and tribological properties of PBT composites are evaluated by electronic universal testing machine and high speed blockon-ring wear tester, respectively. The results indicate that the incorporation of microcapsule could significantly reduce the friction and wear of the composites mainly due to the self-lubricating effect of liquid paraffin released from the ruptured microcapsule during the friction process; however, the mechanical properties of the PBT binary composites are reduced. Hence, PTWs are adopted to effectively improve the mechanical properties of materials which could improve the tribological properties of the ternary composites as well due to the synergistic effects of microcapsules and PTWs. POLYM. ENG. SCI., 59:490-499, 2019. 493 FIG. 7. SEM images of worn surfaces and counterpart surface for PBT binary and ternary composites: (a) worn surface of pure PBT; (b) worn surface of PBT binary composites with 15% microcapsule; (c) worn surface of PBT binary composites with 25% microcapsule; (d) worn surface of PBT ternary composites with 15% PTWs and15% microcapsule; (e) counterpart surface of pure PBT; (f ) counterpart surface of PBT binary composites with 15% microcapsule; (g) counterpart surface of PBT binary composites with 25% microcapsule; (h) counterpart surface of PBT ternary composites with 15% PTWs and 15% microcapsule.
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