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Electrochromic materials have attracted enormous attention due to their potential applications, such as low-power displays, smart windows for energy efficient buildings, electrochromic e-skins, self-dimming rear mirrors for automobiles and so on. Synthetic strategies of new materials for electrochromic are believed to be the key factors that will help to significantly improve the electrochromic performance...
A fluorescent pyrene probe method was applied to measure the critical micelle concentration (CMC) of oligocarbonate-fluorene end-functionalized poly(ethylene glycol) (FmE445Fm) triblock copolymers in water. The CMC decreases with lower temperature and higher values of the hydrophobic block length, m. When analyzed by a closed-assembly micelle model, the estimated energetic parameters find a negative...
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...
Synthesis and electropolymerization of a new conjugated dithieno(3,2-b:2′,3′-d) pyrole (DTP) derivative, namely, 2-(2-(2-(4H-dithieno[3,2-b:2′,3′-d]pyrrol-4-yl)ethoxy)ethoxy)ethanamine, (DTP-alkoxy-NH2) monomer are presented. The electrochemical, spectroelectrochemical effects and biosensor capability towards to glucose oxidase enzyme of P(DTP-alkoxy-NH2) polymer film are investigated in detail during...
Electroactive materials have gained increasing attention for their intelligent applications. In this work, we report the design and synthesis of a novel electrochromic and electrofluorochromic dual-switching polyurea bearing oligoaniline and fluorescent triphenylamine units (PUOT). Cyclic voltammogram of PUOT exhibits two reversible redox couples at 0.96 V/0.73 V and 1.36 V/1.11 V (vs. Ag/AgCl reference...
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...
Combined effects of shear flow and non-isothermal processing, which were akin to the practical industrial processing, on the crystallization of metallocene-made isotactic polypropylene (m-iPP) were investigated by in-situ synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) techniques. The simultaneous appearance of α- and γ-crystals was observed in quiescent samples,...
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...
Despite the indispensable contribution of crystallization to the final properties of poly(lactic acid) (PLA), the combined effect of steady shear and nanofiller(s) remains mostly unsettled. This work employed a combination of steady shear and oscillatory rheological measurements to study shear induced nano-structural breakdown and subsequent nanoparticle orientation and overall structural recovery...
Engineered rubbery materials in practical applications usually contain nanoparticle and microscopic short fiber while no theories could describe the viscoelasticity of the compounds varying with these two kinds of fillers. We describe how the linear rheology of natural rubber compounds varies with the loading of precipitated silica, short nylon fiber, or both. We for the first time disclose a filler...
Electrospun polymer fibers have attracted great attention in recent years because of their unique properties and applications in various areas such as tissue engineering and drug delivery. It remains a great challenge, however, to understand the morphology and property changes of electrospun polymer fibers induced by post-treatment, especially thermal annealing. In this work, we investigate the morphology...
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...
We develop a new method to prepare block copolymer vesicles with high loading capacity of drugs which can then be released in a controlled manner. The block copolymers, including PS-b-PAA, PS-b-PEO, and biocompatible PCL-b-PEO, can directly self-assemble into vesicles in aspirin and encapsulate aspirin by solvent annealing with ethanol which imparts mobility to the originally solid block copolymers...
A series of poly(l-lactide) stereocopolymers with various optical purities (100%–88%) were synthesized by ring-opening copolymerization of the enantiomeric feedstock mixtures of l-lactide and D-lactide at 140 °C for 16 h under reduced pressure. The obtained relationship between microstructure and optical composition of poly(l-lactide) (PLLA) copolymers confirmed that the stannous octoate-catalyzed...
Membranes prepared by electrospinning nonwoven mats have been receiving an increasing amount of interest recently with potential applications as water filtration membranes, drug delivery mats, and environmental sensors. Innovations in membrane processing and characteristics enabled by electrospinning could impact the industry. In this investigation, we demonstrate the effects of changing the chain...
In this article, the kinetic stabilization processes of ultrathin polystyrene (PS) films with different molecular weights (Mw) and interfacial conditions were monitored by controlling the cooling rate. We found that, for the high Mw PS ultrathin film, the fictive temperature (Tf) of liquid-cooled sample shows large change in a broad range of cooling rates while the kinetic stability proves no obvious...
Two isomers of conventional cis-dicyclohexyl-3,3′,4,4′-tetracarboxylic dianhydride (4,4′-HBPDA), i.e. dicyclohexyl-2,3′,3,4′-tetracarboxylic dianhydride (3,4′-HBPDA) and dicyclohexyl-2,2′,3,3′-tetracarboxylic dianhydride (3,3′-HBPDA), were prepared through a four-step procedure. The data from single crystal X-ray diffraction revealed that 3,3′-HBPDA possessed higher structural rigidity/linearity than...
The ability to prepare Polydiacetylenes based materials in the polyvinylidene fluoride matrix polymer is interesting due to the combination of colorimetric and electrical signaling. The new PVDF/PDA composite nanofibers were prepared via the electrospinning method. The self-assembly of diacetylene monomers (PCDAs) occurred during the electrospinning process. The assembled diacetylene monomers in the...
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