Biomass-derived heterogeneous RGO/Ni/C composite with hollow structure for high-efficiency electromagnetic wave absorption

NiCoZn/C@melamine sponge-derived carbon composites with high-performance electromagnetic wave absorption

Abstract Nickel nanoparticle–decorated reduced graphene oxide nanocomposites (NiG) were prepared by a one-step microwave-assisted solvothermal method. The as-prepared NiG nanocomposite systems were further heated up to 800 °C under an inert atmosphere (named NiG-800) to modify their structural and electromagnetic properties. Thereafter, these developed NiG-800 nanocomposite systems of rGO and nickel nanoparticles (25 wt.%) were applied as nanofillers (50 wt.% and 70 wt.%) in a SEBS (Polystyrene- block -poly(ethylene- ran -butylene)- block -polystyrene) polymer matrix to create NiG-800(50)-SEBS and NiG-800(70)-SEBS nanocomposites. The addition of NiG-800 to SEBS led to an increase of Young’s modulus from 16 (SEBS) to 35 MPa (NiG-800(70)-SEBS) while the maximum elongation is still around 300%. The developed NiG-800(70)-SEBS nanocomposite exhibited high-performance electromagnetic wave absorption (minimum reflection loss RL min ≈ –48.2 dB at 9.29 GHz) at a low thickness of 2.3 mm in the frequency range of 8.2−12.4 GHz. The prepared NiG-800(70)-SEBS nanocomposite has the potential of an electromagnetic wave absorber. The NiG-800(70)-SEBS nanocomposite reported here has total shielding efficiency &gt; 10 dB at a thickness of 1 mm in the whole frequency range (X-band) with reflection ≈ 50% and absorption ≈ 40% which has the potential for electromagnetic wave absorber applications. 

/pdf/nickel-nanoparticle-decorated-reduced-graphene-oxide-via-one-1s64qoj9.pdf

Nickel nanoparticle–decorated reduced graphene oxide via one-step microwave-assisted synthesis and its lightweight and flexible composite with Polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene polymer for electromagnetic wave shielding application

Coordinative chain transfer polymerization, CCTP, is a degenerative chain transfer polymerization process that has a wide range of applications. It allows a highly controlled synthesis of polyolefins, stereoregular polydienes, and stereoregular polystyrene, including (stereo)block as well as statistical copolymers thereof. It also shows a green character by allowing catalyst economy during the synthesis of such polymers. CCTP notably allows the end functionalization of both the commodity and stereoregular specialty polymers aforementionned, control of the composition of statistical copolymers without adjusting the feed, and quantitative formation of 1-alkenes from ethene. A one-pot one-step synthesis of the original multiblock microstructures and architectures by chain shuttling polymerization (CSP) is also an asset of CCTP. This methodology takes advantage of the simultaneous presence of two catalysts of different selectivity toward comonomers that produce blocks of different composition/microstructure, while still allowing the chain transfer. This affords the production of highly performant functional polymers, such as thermoplastic elastomers and adhesives, among others. This approach has been extended to cyclic esters' and ethers' ring-opening polymerization, providing new types of multiblock microstructure. The present Review provides the state of the art in the field with a focus on the last 10 years.

Coordinative Chain Transfer and Chain Shuttling Polymerization.

High-performance composite elastomers with abundant heterostructures for enhanced electromagnetic wave absorption with ultrabroad bandwidth.

MOFs derived Fe/Co/C heterogeneous composite absorbers for efficient microwave absorption

The synthesis of isotactic polypropylene (iPP)-based block copolymers by means of controlled isoselective polymerization of propylene with high turnover frequencies is an ongoing challenge in industry and academia. Herein, we report a new strategy for reversible coordinative chain transfer polymerization of propylene and propylene–ethylene with a pyridylamido hafnium/[Ph3C][B(C6F5)4] catalyst system and iBu3Al as a chain transfer agent under conditions that were optimized so that the rate constants for chain transfer and chain propagation were similar (kp ≈ kct). Using this new strategy, we could obtain iPP-b-poly(ethylene-co-propylene) and iPP-b-poly(ethylene-co-propylene)-b-iPP block copolymers with controlled molecular weights, hard/soft block ratios, and compositions via a continuous-monomer-feeding approach like that used in living polymerization systems. The polymerization reactions produced uniform block copolymers with previously inaccessible microstructures. The copolymers have both a semicrystalline iPP block ([mmmm] > 99%, melting temperature > 155 °C) and soft ethylene–propylene copolymer blocks (glass transition temperature < −30 °C), with tunable high molecular weights (∼210 kDa) and Schulz–Flory distributions (PDI < 2.5). These promising block copolymers possess dramatically improved tensile properties (30–50-fold increase in elongation at break) relative to those of the iPP homopolymer, whereas the yield strength and strength at break were similar to those of the iPP homopolymer. By tuning the block composition and hard/soft block ratio, we could obtain block copolymers ranging from ductile elastomers to tough plastics. Our new strategy not only sheds significant light on olefin CCTP but also has great potential utility for the industrial production of high-performance polyolefin materials. 

Preparation of Well-Controlled Isotactic Polypropylene-Based Block Copolymers with Superior Physical Performance via Efficient Coordinative Chain Transfer Polymerization

Lightweight porous carbon/rGO/Ni chain composite with excellent microwave absorption performance and multi-functional properties

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MOFs derived Fe/Co/C heterogeneous composite absorbers for efficient microwave absorption

Preparation of Well-Controlled Isotactic Polypropylene-Based Block Copolymers with Superior Physical Performance via Efficient Coordinative Chain Transfer Polymerization

Lightweight porous carbon/rGO/Ni chain composite with excellent microwave absorption performance and multi-functional properties