The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Alkali lignin, a by-product of commercialized paper making process, is an abundant and environmental-friendly material. In this paper, polyacrylontrile (PAN) -based hollow fiber was fabricated by one-step wet-spinning technique through blending with alkali lignin at different ratios. The phase diagram of the blends was determined by titration method. When alkali lignin is added into the PAN solution,...
In this work, two different functionalized graphene oxide (GO), sulfonic acid functionalized GO (SGO) and amino functionalized GO (NGO), were synthesized and incorporated into the sulfonated poly(arylene ether nitrile) (SPEN) by single doping and codoping. It was found that the codoping of SGO and NGO contributed to the enhancement of proton exchange membrane performance. These two functionalized...
Liquid crystals (LCs)/polymer composites are promising candidates for the next-generation of large-area processible and flexible electro-optical (E-O) materials due to their combination of the fast-responsive characteristics of LCs and the excellent physical properties of polymer. However, the current LCs/polymer system, represented by the polymer dispersed liquid crystals (PDLC), are suffering from...
A new class of yolk-shell structured precious metal@microporous polymer nanoparticles has been successfully developed. The polymer shells obtained by hypercrosslinking present well-developed permanent microporosity, controllable thickness, and good mechanical properties, and thus can be utilized to protect the precious metal yolks including Au and Ag nanoparticles from aggregation and inactivation...
An efficient metal-free bimolecular homodifunctional ring-closure method was developed specifically for preparing well-defined cyclic polymers from unconjugated vinyl monomers. In this approach, well-defined homodifunctional linear polymers with azide terminals were prepared by using the reversible addition chain transfer polymerization/macromolecular design by interchange of xanthates (RAFT/MADIX)...
A facile new route for fabricating carbon/zinc oxide (carbon/ZnO) hybrid materials suitable for pseudocapacitor electrodes with high cycling stability is presented. The synthesis of carbon/ZnO nanocomposites involved the uniform dispersion of octylamine (OA) capped ZnO nanocrystals into poly(styrene-r-acrylonitrile) (PSAN) copolymers and the subsequent pyrolysis of the nanocomposite precursor material...
Poly(ethylene-co-1,4-cyclohexanedimethylene 2,5-furandicarboxylate) (PECF), with different contents of trans- or cis-CHDM isomers, was synthesized to investigate the influence of CHDM configuration on its properties. Before properties investigation, their chemical structures, composition and molecular weight as well as molecular weight distribution were determined by nuclear magnetic resonance (NMR)...
Redox/temperature responsive poly(N-isopropylacrylamide/N-hydroxyethylacrylamide) (P(NIPA/HEAA)) nonionic nanogels (NP-BAC) crosslinked with N,N′-Bis(acryloyl)cystamine (BAC) have been prepared. An analogous nanogel incorporating N,N′-methylenebisacrylamine (BIS), a reduction-insensitive nanogel (NP-BIS), was chosen as a control nanogel. Compared to the nondegradable NP-BIS nanogel, NP-BAC nanogel...
A series of heterografted PVSt-g-(PS/PE) based on polystyrene (PS) backbone with mixed PS and polyethylene (PE) side chains was obtained, in which the branching density of PVSt-g-(PS/PE) was above 72%. Because of the extremely short backbone, long side chains and high branching density in these comb-like copolymers, the topological structure of PVSt-g-(PS/PE) was similar to asymmetrical star copolymers...
A novel three-dimensionally (3D) ordered hierarchically porous polypyrrole (3DOHPPy) is successfully synthesized via a simple chemical polymerization method by using silica colloidal crystals as templates. The 3DOHPPy possesses a large BET specific surface area (118.5 m2 g−1), 3D ordered interconnected macropores (240 nm) and mesopores (2–3 nm) on the macropore walls. The sulfur/3DOHPPy (S/3DOHPPy)...
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...
Methoxy-poly(ethylene glycol)-block-poly(l-lactide-random-glycolide) (mPEG-PLGA) with relatively high monomer conversion, fixed LA/GA ratio, controlled molar mass, and random PLGA sequences was synthesized under microwave irradiation at 120 °C. The microstructure, i.e., the sequence of lactyl and glycolyl units, of the PLGA block was analyzed using proton and carbon-13 nuclear magnetic resonance spectroscopy...
Hydrogels with good mechanical properties have received intense interests recently. Simplifying the method to prepare tough hydrogels and meantime incorporating additional properties such as anti-swelling, self-recovery, healing ability, facile processability, and recyclability will likely expand their applications significantly. Here we report a simple method to prepare tough hydrogels: dripping...
Self-assembly induced increase of magnetic susceptibility for the tadpole-shaped block copolymer based on paramagnetic FeCl4 pyridinium was reported in this work. The tadpole-shaped block copolymer was prepared by sequential reversible addition-fragmentation chain transfer polymerization of styrene (St) and 4-vinylpyridine (4VP) at the presence of chain transfer agent-modified polyhedral oligomeric...
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...
In this work, the lattice self-consistent field theory (SCFT) is modified to obtain the native state with a definite conformation of a given protein chain. The method has been applied to the simplest protein model – the 2D HP protein model. Starting with a random initial external field, a specific conformation of the given protein corresponding to the native state marvelously emerges after a series...
Aliphatic-aromatic poly(carbonate-co-ester) random copolymers poly(butylene carbonate-co-furandicarboxylate)s (PBCFs) with different composition had been prepared from dimethyl carbonate (DMC), 1,4-butanediol (BD) and bio-based dimethyl furan-2,5-dicarboxylate (DMFA) by two-step melt polycondensation method. A series of characterization results can be explained as follows: the varying melting temperature...
Shape memory thermoplastics are an important class of engineering polymers with smart characteristics. A series of diblock polymers, polymethylmethacrylate-b-poly(butylacrylate-co-2-acrylamido-2-methyl-1-propanesulfonic acid) (PMMA-b-P(BA-co-AMPS)) with varying molecular weights and compositions were conveniently synthesized. The monomer selection as well as the design of molecular architecture facilitated...
Gene therapy has shown great potential in the treatment of various diseases, and the development of low-toxic and efficient gene carriers is still one of the burning issues for gene therapy. PEGylation is generally regarded as an efficient strategy to improve the biocompatibility of non-viral vectors. However, PEGylation also led to several problems such as lower cellular uptake, difficult endosomal...
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,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.