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To achieve high-performance thermosets from renewable resources, six acetovanillone-derived poly(aryl ether)s (two with the acetic moiety, two with the phenyl methacrylic moiety, and two with the vinyl benzyl ether moiety) were prepared. The poly(aryl ether)s with acetic- or phenyl methacrylic moiety were applied as epoxy curing agents to cure with a phenol-dicyclopentadiene epoxy resin (HP7200)....
Nanoparticles with well-ordered structures have attracted great attention recently due to its potential application, including data storage media, microelectronics and sensors. Herein, we report a strategy of the periodic arrays of iron oxide nanoparticle with supramolecular thin films. The thin films of PS-b-P2VP/FAA supramolecules were solvent-vapor annealed with mixed solvent-vapor condition of...
A new building block of two-dimensional (2D) A1-π-A2 copolymers for P(dDTPz-ID) and P(dDTPz-DTBT) was designed and synthesized. Their structures have two strong acceptor units (isoindigo and benzothiadiazole derivatives) in the backbone, respectively. It displayed a benefit of A1-A2 building blocks, which is complementary and broad light absorption from 300 to 750 nm due to acceptors with different...
To achieve high-performance thermosets, three diallyl-containing main-chain type benzoxazine polymers, (MCBP) were prepared from Mannich condensation of 2,2′-diallyl bisphenol A, paraformaldehyde, and three diamines: 4,4′-diaminodiphenylmethane (DDM), 4,4′-oxydianiline (ODA), and 2,2′-bis(4-(4-aminophenoxy)phenyl)propane (BAPP), respectively. These MCBPs can be cured and general a phenolic hydroxyl...
The nanowire of conjugated polymer with higher density is desirable for its improved charge transport. However, at a higher solution concentration, the conjugated polymer chain entanglement is severe and not beneficial for the nucleation to grow nanowires. In this paper, we control the equilibrium of entanglement ↔ disentanglement ↔ nucleation and growth by tuning the radius of interaction (Ra) between...
Three amine-functionalized 1,1-diphenylethylene (DPE) derivatives (DPE-(NMe2)2, DPE-NMe2 and DPE-SiH/NMe2) were used to study the end-capping reactions of poly(styryl)lithium (PS-Li) for investigating the effect on end-capping of electron-donating groups in DPE structures. In situ 1H NMR was used to measure the kinetic parameters of end-capping reactions. When the DPE derivative was held constant...
NORYL™ SA9000 resin is a commercialized telechelic PPO oligomer with phenyl methacrylate end groups. However, neat SA9000 thermoset is brittle after thermally curing. To find a method to enhance the toughness of neat SA9000 thermoset, three model reactions are designed. The first one is the 4-dimethylaminopyridine (DMAP)-catalyzed homopolymerization of glycidyl phenyl ether. The second one is the...
Poly(l-lactic acid) (PLLA) sheets with dramatic improvement of mechanical properties, especially toughness, were obtained by uniaxial pre-stretching around Tg. It was found that a network structure consisting of cohesional entanglements was formed during the usual compression molding process, leading to the brittleness of PLLA, and the destruction of the network structure due to disentanglement after...
Synthesis of hybrid hetero-arms star polymer with precisely defined arms distribution in three dimensional (3D) space is still a challenge. Herein, we have employed cubic polyhedral oligomeric silsesquioxane (POSS) nanoparticle as a scaffold to synthesize a biodegradable Janus POSS star polymer (oom-T8PLLA5PCL3), which contains an inorganic rigid POSS core, three poly(ε-caprolactone) (PCL) arms and...
Silica modified by using 3-mercaptopropyl-ethyoxyl-di(tridecyl-pentamethoxy)-silane (Si-747), which is a silane coupling agent with long arms, was investigated in this research. The Si-747 that had a physical interaction with silica (Phy-747) and had a chemical interaction with silica (Che-747) could be separated by the extraction. The amount of Che-747 and Phy-747 were confirmed by thermal gravimetric...
Theoretical investigation on the reaction of maleic anhydride (MAH) in the UV radiation cross-linking process of polyethylene as high voltage cable insulation materials is accomplished at B3LYP/6-311 + G(d,p) level. The reaction potential energy information of 10 reaction channels is identified. The results show that the UV radiation cross-linking reaction of polyethylene is initiated by benzophenone,...
In this feature article, we first make some simple reviews about the most popular theories for glass transition: 1) Free volume theory, 2) Entropy theory, 3) Götze’s Mode coupling theory, and 4) Caging and Jamming theory. We address the issue of existing studies of glass transformations. Then, we review some special colloidal/polymer model systems which can give a repulsive potential together with...
A series of poly(arylene ether ketone)s (PAEKs) with dense sulfonic-acid-functionalized pendants were successfully synthesized by the Ullmann C–N coupling of a polymer precursor containing pendant iodobenzene rings and 3,6-ditrityl-9H-carbazole, followed by sulfonation using chlorosulfonic acid. A tough transparent membrane, which exhibited suitable dimensional stability and high proton conductivity,...
High-permittivity (high-k) materials play a key role in advanced electronics and electrical power systems. How to prepare the flexible material with high permittivity and low dielectric loss turns out to be a hard work due to the essential low permittivity of polymers. In this work, a kind of ductile polymer-based composites was fabricated by incorporating ionic liquids into polymer matrices. The...
The double-stranded block copolymers containing ionic conductive and strong polar segments were synthesized by ring-opening metathesis polymerization, and self-assembled into the hollow sphere nanostructure. These block copolymers displayed high dielectric constant of 25, low dielectric loss of 0.02, enhanced stored/released energy density of 2.60/2.38 J cm−3 at 245 MV m−1, and good charge-discharge...
A rigorous model is developed to predict the configurations of the branched polymers formed by the copolymerization of linear monomers in the presence of multifunctional branching units. Conventional studies on the configuration of branched polymers generally consider the statistical properties of the growth of only one element or polymerization from one component (e.g., dendrimers, hyperbranched,...
A novel hyperbranched polyether epoxy (HBPEE) bearing a stiff fluorene unit and flexible aliphatic chains has been synthesized using a one-pot approach and used as a toughener for bis-benzoxazine resin (MDA-BOZ). Effects of loadings and molecular weight of HBPEE on curing behavior, rheology properties, static mechanical, dynamic mechanical and thermal properties of the hybrid systems have been studied...
The preparation of diketopyrrolopyrrole-based polymer nanowires seems very difficult, probably due to the fact that the nanowires length direction is along the main chain not the π-π direction. For the nanowires whose length direction is along the main chain, the probability of the short nanowires to meet the ends of other molecules to grow longer is very small. Herein, we prepared long 3,6-bis-(thiophen-2-yl)-N,N’-bis(2-octyl-1-dodecyl)-1,4-dioxo-pyrrolo...
Three different monomers have been used to prepare novel Bergman cyclization-based porous organic polymers (BCPOPs). The synthesis route to BCPOPs is facile and highly-effecient. Meanwhile, BCPOPs show high physicochemical stability and excellent porosities. The Brunauer–Emmett–Teller specific surface area of BCPOPs is up to 860 m2 g−1, while the carbon dioxide uptake reaches to 11.1 wt% (1.0 bar...
The film quality is the core to produce long-life and efficient organic light emitting devices by ink-jetting printing technology which is deeply related to the ink droplet coalescence process, especially the coalescence bead morphology and thickness. However, the fluid flow from impacted drop to the previously deposited drops (drop to bead flow) usually leads to an asymmetry and heterogeneity of...
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