A variety of multisubstituted cyclooctenes were prepared and employed as monomers for ring-opening metathesis polymerization using the Grubbs second or third generation catalysts. The resulting polymers characterized by NMR spectroscopy, size exclusion chromatography, differential scanning calorimetry. Monomers possessing a substituent at 3-position afforded highly regio- stereoregular polyalkenamers, from which corresponding sequence-specific vinyl quaterpolymers obtained upon...

The high dewetting abilities of lotus leaves can be transited to a complete wetting state by soaking the in water at depth 50 cm for 2 h. However, after being dried N2 gas, behavior may mostly restored. This indicates that experimental procedure might considerably affect leaves. To discover mechanism underlying this interesting phenomena, force was used characterize surfaces, and model studies mimic papillae were done. Surface hydrophobicity, sizes, rise angles, secondary structures models'...

Precision linear vinyl acetate/ethylene (VAE) copolymers containing acetoxy groups on precisely every eighth backbone carbon were synthesized by ring-opening metathesis polymerization (ROMP) of racemic 3-acetoxy cyclooctene (3AcCOE) followed hydrogenation. The use enantiomerically pure 3AcCOE resulted in an optically active polyalkenamer that afforded isotactic precision VAE materials after Both these polymers are semicrystalline (by differential scanning calorimetry and wide-angle X-ray...

A smart role of the leaf margin makes lotus surface dry when a floats on water's surface. It is mainly attributed to anisotropic topography composed flat folds at margin, which are quite different from upper including micro-papillae. The around forms ring-band, introduces strong energy barrier against water that tends return leaf. As result, underneath hardly overflows onto by getting across margin. Thanks ultra narrowness can still be shed through This finding helps understanding structure...

Triboelectric generators (TENGs) have been extensively studied as a new energy for low cost and the universally applicable prospect. Meanwhile, perovskites applied in TENG show good performance view of high carrier mobility, long life dielectric properties. The asymmetry structure orthogonal phase CsPbBr3 perovskite endows it with ferroelectric property induces misalignment positive negative charge centers. Herein, surface halogen doped inorganic CsPbX3 (X = Cl–, Br–) are theoretically...

We describe a simple and inexpensive method to produce lotus leaf-like Cu-ferrite films on copper alloy engineering materials fabricated via sol−gel process chemical modification. The show stable superhydrophobicity magnetization, even in many corrosive solutions, such as acidic or basic also oxidizing solutions. Water aqueous solutions (pH = 2−13) have contact angles of 156 ± 2 154 2° the treated surfaces Cu alloy, respectively. Such superhydrophobic with magnetic properties will greatly...

We demonstrated that the ring-opening metathesis polymerization (ROMP) of 3-substituted cyclooctenes bearing polar substituents allows synthesis highly regio- and stereo-regular polymers. A series polyalkenamers with 90–99 % head-to-tail/trans configuration were synthetized in good yields (33–87 yield). Upon saturation backbone using diimide, these polymers represent a class linear polyethylene derivatives where side chain is located on every eighth carbon. The thermal properties both...

Abstract Conductive polymer composites (CPCs) with carbon nanotubes (CNTs) have exhibited desirable sensing capacities to external stimuli. In this study, it is found that poor dispersion of single‐wall CNTs gives rise low mechanical strength and unsteady responsive signal outputs CPCs as strain materials. With attempt solve problem, we prepare the conductive silicone rubber hybrid CNT masterbatch black (CB) fillers (CNT/CB composites) by drying mixing method. Hybrid CBs separate loosen...

In this article, nanostructured superhydrophobic polymeric surfaces were fabricated by a simple (one-step) reproductive method of anodic aluminum oxide (AAO) template extrusion. By tuning the diameter AAO and pressure to extrude, high-density polyethylene (HDPE) nanofiber with different nanometer roughness prepared, various sliding angles (SAs) drops on these measured. The results impact HDPE indicated that SAs very important for dynamic wettability surfaces. one-step extrusion has advantage...

Nylon-3 polymers contain β-amino-acid-derived subunits and can be viewed as higher homologues of poly(α-amino acids). This structural relationship raises the possibility that nylon-3 offer a platform for development new materials with variety biological activities, prospect has recently begun to receive experimental support. homo- copolymers prepared via anionic ring-opening polymerization β-lactams, use an N-acyl-β-lactam coinitiator in reaction allows placement specific functional group,...

Microscale ratchet structured surfaces were coated with nanoparticles, which resulted in anisotropic behavior of superparamagnetic microdroplet by magnetic field actuation. This structure enables microdroplets to generate the through alternative external field. A tuning was revealed changing height ratchet, numbers and size microdroplets. It is significant understand wetting properties on superhydrophobic structure.

AB diblock copolymers were prepared by sequential ring-opening metathesis polymerization of cyclooctenes catalyzed a Ru-based Grubbs catalyst. The relatively slow cis-3-phenylcyclooct-1-ene (3PC) or cis-cyclooct-2-en-1-yl acetate (3AC) was first carried out and then followed the faster unsubstituted cis-cyclooctene (COE) from active Ru-alkylidene chain ends. In contrast, simultaneous two monomers provides with statistical monomer distribution owing to extensive transfer. resulting...

Abstract To overcome the modification shortcoming of phenol resin (PR) in decreasing loss factor peak (tan δ max ) nitrile butadiene rubber (PR/NBR) blends, hindered AO‐80/PR/NBR hybrids were successfully prepared. The tan is found to increase with increment AO‐80 content while they almost remains same widths damping temperature range as PR/NBR blend. Their properties can be regulated well by controlling AO‐80. Various experimental data Fourier transform infrared (FTIR) spectroscopy,...

The sacrificial bonds in natural materials have inspired the preparation of shape memory polymer (SMP), which can be prepared through construction dual cross-linking networks a matrix. With rise 4D printing technology, fine control over recovery SMPs, especially time, is urgently needed. In this study, high-temperature aging method adopted to tune time cross-linked SMPs. Shape acrylonitrile butadiene rubber composite (i.e., NBR-C) by introducing Zn2+–C≡N coordination bonding and sulfur...

In this paper, we discuss various edge effects on the outflow behaviors of water around to solve troublesome problem that frequently brings about great inconvenience in daily lives. A simple method pressing a drop over edges conical frustum was adopted here explore stability suspended edges. On basis experiments and theoretical analyses, critical pressure P(c) work DeltaE(w) were used for characterizing an edge, which found be closely related geometric morphologies, microstructures sides,...

A new family of β-lactams is described that enables anionic ring-opening polymerization (AROP) to prepare nylon-3 materials bearing diverse appended functionality, including carboxylic acid, thiol, hydroxyl, and secondary amine groups. Nylon-3 copolymers generated with the are shown display distinctive self-assembly behavior biological properties.

Abstract Carbon blacks are important fillers to reinforce, functionalize rubber materials and reduce their prices. However, environment‐friendly surface modification of carbon is not trivial conduct, yet challenging effectively sever broad galleries. Inspired by wet adhesion mussel, tea polyphenols (TPs) coated on vacuum absorption method (i.e., TP@C) then they mixed into nitrile butadiene with ZnCl 2 . Specially, Zn 2+ /TP@C coordination interfaces formed together crosslinking structures...

Recently, one interesting wetting phenomenon was found whereby a live frog can stably stand or easily jump on floating lotus surface. Inspired by the leaf, constructing lotus-like substrate is important to provide powerful aquatic support. In this article, flexible and light-weight superhydrophobic paper successfully fabricated coating mixture of polystyrene-poly(methyl methacrylate) copolymer (PS-co-PMMA) silica nano-particles. The micro/nano structures from composite render common papers...

Antioxidants are necessarily used in nitrile butadiene rubber (NBR) products to prolong their lifetimes. But blooming of antioxidants limits the anti‐aging efficiency. Herein, a novel solution was proposed avoid such blooming. Antioxidant, 3, 9‐bis‐{1, 1‐dimethyl‐2( β ‐[3‐tert‐butyl‐4‐hydroxy‐5‐methylphenyl‐] propionyloxy) ethyl}‐2, 4, 8, 10‐tetraoxaspiro [5, 5]‐undecane (AO‐80) loaded carbon nanotubes (CNTs) by chemically grafting after shearing force and then physically melting...