Graphene oxide (GO) was successfully prepared by a modified Hummer's method. The reduction effect and mechanism of the as-prepared GO reduced with hydrazine hydrate at different temperatures time were characterized x-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), elemental analysis (EA), diffractions (XRD), Raman thermo-gravimetric (TGA). results showed that mainly depended on treatment temperature instead time. Desirable can only be obtained high temperature....

A segregated structure results in an EMI SE up to 46.4 dB CNT/polyethylene composites with only 5 wt% CNTs.

The notion of toughening poly(lactic acid) (PLA) by adding flexible biopolymers has generated enormous interest but yielded few desirable advances, mainly blocked the sacrifice strength and stiffness due to uncontrollable phase morphology poor interfacial interactions. Here control methodology, that is, intense extrusion compounding followed "slit die extrusion-hot stretching-quenching" technique, was proposed construct well-aligned, stiff poly(butylene succinate) (PBS) nanofibrils in PLA...

Abstract In this work, the effect of expandable graphite (EG) and ammonium polyphosphate (APP) on flame retardancy mechanical properties rigid polyurethane foam (RPUF) was studied. The results indicated that both EG APP could effectively improve RPUF, while better than APP. When flame‐retardant loading 15 wt %, limited oxygen index (LOI) values APP‐ EG‐filled RPUF were 24.5 32 vol respectively. According to LOI test, optimal ratio in composites 1 : by weight, at which value % (APP + EG)/RPUF...

Abstract The comparative study of rigid polyurethane foam (RPUF) nanocomposites based on graphene nanosheets (GNSs) and carbon nanotubes (CNTs) has been reported. A GNS content 0.3 wt% in polyol turns to be optimal for its foamability with the isocyanate component, as verified by rheology measurements. Scanning electron microscopy transmission observations reveal a homogeneous dispersion GNSs CNTs RPUF nanocomposites. Only loading led 36% 25% improvement respectively compressive modulus...

Remarkable combination of excellent gas barrier performance, high strength, and toughness was realized in polylactide (PLA) composite films by constructing the supernetworks oriented pyknotic crystals with assistance ductile situ nanofibrils poly(butylene adipate-co-terephthalate) (PBAT). On basis that permeation molecules through polymer materials anisotropic structure would be more frustrated, we believe crystalline textures cooperating inerratic amorphism can favorable for enhancement...

Polylactide (PLA) films with an excellent balance of toughness and stiffness were realized by extensional stress efficiently. For the relatively low stress, gauche–gauche conformers that originated from oriented amorphous chains lead to super-toughening behavior. Among higher strain-induced orientation crystallization act as driving force reinforcement. This mechanism is evidenced pronounced enhancement in elongation at break 16.9 up 294.9% accompanying variation yield strength 45.3 135.5...

Abstract The carbon nanotubes (CNTs)/rigid polyurethane (PU) foam composites with a low percolation threshold of ∼ 1.2 wt % were prepared by constructing effective conductive paths homogeneous dispersion the CNTs in both cell walls and struts PU foam. presented excellent electrical stability under various temperature fields, highlighting potential applications for long‐term use over wide range from 20 to 180°C. Compression measurements dynamical mechanical analysis indicated 31% improvement...

The challenge of hitherto elaborating a feasible pathway to overcome the conflicts between strength and toughness polylactide (PLA) still remains among academia industry. In current work, unique hierarchal structure flexible poly(butylene adipate-co-terephthalate) (PBAT) in situ nanofibrils integrating with abundant PLA shish-kebabs as strong building block was disclosed expresses its capability conquer this dilemma. Substantially simultaneous enhancement on tensile strength, impact...

Stereocomplex crystals (SCs) of polylactides (PLAs) with melting points over 220 °C show great potential to improve the heat deflection resistance PLAs. However, it is still a challenge fabricate PLA materials high SC contents due requirement for production efficiency and thus an extremely large cooling rate. In present work, upgraded injection molding method, i.e., oscillation shear (OSIM), was employed impose intense flow on poly(l-lactide) (PLLA)/poly(d-lactide) (PDLA) samples. It proved...

This study has developed a carbon nanotube (CNT)/ethylene vinyl acetate (EVA)/ultrahigh molecular weight polyethylene (UHMWPE) composite with unique double percolated conductive structure, in which only 20 wt% of CNT enriched EVA is needed to form continuous network. Compared conventional polymer composites (CPCs) require filler‐enriched content up 50 wt%, the low CNT/EVA gives rise an unprecedentedly increased effective concentration CNT/EVA/UHMWPE composite. The exhibits electrical...

Traffic analysis attacks are passive that try to deduce the traffic pattern based on eavesdropped information. Through analyzing packet traffic, it can location of strategic nodes, and then launch an active attack those locations, such as DoS attack. Therefore, defending against a is prevent adversary from tracing critical sensor nodes. Due open wireless communication media exposing context information adversaries, we cannot use traditional encryption authentication adversaries eavesdropping...

The mechanical mixing and hot compaction method was firstly used to fabricate graphite/polymer segregated composite for efficient electromagnetic interference shielding.