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Isotactic polypropylene (iPP)/glass fiber (GF) composites with different specific interfacial features (viz., α-spherulite, α-cylindrite and β-cylindrite) were prepared via shear-induced interfacial crystallization. α-spherulite, α-cylindrite and β-cylindrite were successively encouraged at the interface between iPP matrix and GF with increasing the fiber-pulling speed. Moreover, the composite specimens...
The glass transition processes of the soft-segments (SS) in a series of poly(urethane urea) (PUU) elastomers were studied by solid-state NMR. Two SS fractions, rigid (SSr) and mobile (SSm), can be discerned by time-domain wideline separation, 13C1H dipolar dephasing, and frequency-switched Lee-Goldberg spin-locked T1ρ relaxation experiments. At increasing temperature, part of the SSr population turns...
Hybrid hydrogels composed of imogolite fibrous nanotube (IG) and hyaluronic acid (HA) were prepared. Hexamethylenediamine (HMDA) was used as a non-toxic chemical cross-linker. The homogeneous dispersion of IG in the HA solution was accomplished by careful pH control, and subsequent chemical cross-linking provided mechanically stable self-standing hybrid hydrogels. The IG/HA hybrid hydrogels were characterized...
Supramolecular polymeric hydrogels, combining the responsiveness of noncovalent interactions and good mechanical properties of polymers, have received increasing attentions due to their high strength, multi-responses to stimuli, and good processability. In this article, we develop transparent physical hydrogels by simply casting and reswelling the films of copolymers synthesized by polymerization...
DNA hydrogels are promising soft materials because of the distinctive properties of DNA such as biocompatibility, coil-globule transition, molecular recognition, and selective binding. However, such hydrogels synthesized so far suffer from poor mechanical properties and low dimensional stability, which limit their stress-bearing technological applications. Here, we introduce a novel concept for the...
Soft, tough and flexible curdlan (CD) hydrogels were fabricated by covalent cross-linking of CD using ethylene glycol diglycidyl ether (EGDGE) as a cross-linker. The mechanical properties of the gels were investigated by uniaxial compression test. CD hydrogels showed non-linear elastic behavior. The elastic modulus of CD hydrogels was 0.004–0.011 kPa. CD hydrogels were highly tough and did not fracture...
The vinylic monomer methylstyrene farmin (MSF) was synthesized by interacting p-chloromethyl styrene with farmin in basic distilled water. Crosslinked poly(methyl styrene farmin) nanoparticles (PMSF NPs) were then synthesized by dispersion co-polymerization of the MSF monomer with the crosslinking monomer tetra(ethylene glycol) diacrylate (TTEGDA) in an aqueous continuous phase. The effect of various...
Multiwall carbon nanotubes (MWNT) have been functionalized using nitric acid. The functionalized MWNTs (f-MWNT) form stable dispersions in butanol, while as received nanotubes do not. The f-MWNTs/butanol dispersion was added with polypropylene (PP) or maleic anhydride grafted polypropylene (MA-g-PP) in xylene solution to form PP/f-MWNT and MA-g-PP/f-MWNT master batches, respectively. Both PP and MA-g-PP...
Three half-titanocene complexes 2a-3a bearing dibenzhydryl-substituted aryloxide ligands CpTiCl2(O-2,6-Ph2CHC6H2-4-Me), 2a; CpTiCl2 (O-2,6-Ph2CHC6H2-4-OMe), 2b; Cp*TiCl2(O-2,6-Ph2CHC6H2-4-Me), 3a were synthesized. All the complexes were characterized by NMR spectroscopy and elemental analysis. The molecular structures of complex 2a and 2b were further determined by single crystal X-ray diffraction,...
Highly aligned poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) films were processed using a scalable one-step melt extrusion processing route. Crystalline structure and orientation were optimized by controlling the melt extrusion conditions. XRD patterns suggested the nearly perfect alignment of the c-axis (polymer chain direction) along the extrusion direction in the optimized as-extruded...
In this article, multiwalled carbon nanotubes (MWCNTs) with polymer shells based on cross-linked divinylbenzene (DVB) were controllably synthesized via direct in situ free-radical polymerization, thereby producing a hybrid composed of a core-shell microstructure and MWCNT center. The coated MWCNT hybrids (DVB@MWCNTs) were ultimately compounded with polystyrene (PS) to prepare nanodielectric composites...
Well-defined amphiphilic and biocompatible poly(vinyl alcohol)-block-poly(l-lactide) copolymers (PVA-b-PLLA) were synthesized by the combination of reversible addition-fragmentation chain transfer (RAFT), ring opening polymerization (ROP), and click chemistry. First, an innovative azide-functionalized xanthate mediated chain transfer agent (CTA) [S-(3-azidopropyl propanamide)-(O-butyl xanthate)] was...
Hyperbranched polymers are macromolecular systems of high branching density. They play a key role in the forefront of macromolecular synthesis for having features different from those of non-hyperbranched polymers and unique properties that make them amenable for use in a variety of applications. This paper presents the results from the synthesis of hyperbranched polymers of different molecular architecture,...
We prepared nonflammable liquid polymer electrolytes for lithium-ion batteries by mixing ethoxylated perfluoropolyethers (PFPEs) with LiN(SO2CF3)2 salt. Interestingly, we identified the presence of chain coupling in the PFPE polymers and their functionalized derivatives, resulting in a mixture of PFPEs with varying molecular weights. The distribution of molecular weights, along with PFPE's multiple...
This study focuses on a copolymer of hyperbranched polystyrene and poly(N-isopropylacrylamide) (HBPSt-g-PNIPAM) as a surface modifier for conventional polystyrene (PSt) dishes to fabricate a thermo-responsive cell culture substrate, and especially discuss the role of the hyperbranched structure on the cell sheet detachment performance. HBPSt-g-PNIPAM was synthesized by grafting PNIPAM from the termini...
The small-angle neutron scattering (SANS) technique has been used to investigate the structure of dendrimers based on polyhedral oligomeric silsesquioxane (POSS) in solution. Three generations and two distinct terminal groups (either vinyl or polyethylene glycol (PEG) terminal groups) as well as four concentrations for each dendrimer have been measured in deuterated tetrahydrofuran. Two main scattering...
We report radical coupling copolymerization (RCCP) of various pairs of in-situ formed benzyl-type biradicals derived from dibromides in the presence of Cu/ligand. The monomer sequence distributions and compositions of copolymers were measured by 1H NMR. RCCP can be employed to synthesize some new kinds of polymers, such as polyether, polysulfone and poly(substituted arylene), under mild condition...
Polypropylene (PP)/carbon nanotube (CNT) nanocomposite studies have been extensively reported in the literature. Most of this previous work has been carried out by dispersing CNTs in PP matrix via melt processing, while only limited studies have been carried out where CNT dispersion in PP was achieved by solution processing. Here we report the melt processing of PP/multiwall carbon nanotubes (MWNT)...
Nanoporous materials have been attracting considerable attention for various applications. We have reported the preparation method of nanoporous block copolymers (BCPs) by CO2 treatment. In this study, the difference between CO2-swollen and nanoporous BCPs was analyzed: nanoporous BCPs after CO2 treatment were compared with the CO2-swollen BCPs during the process in terms of nanoscopic structure and...
Resistive switching effect has been explored in the hybrid nanocomposite of organic-inorganic materials by fabricating all printed memristive device on a flexible PET substrate. Configuration of as fabricated device is Ag/PVOHZnSnO3/Ag. Extremely uniform and high quality bottom Ag electrodes were deposited by reverse offset printing. Active layer of PVOHZnSnO3 nanocomposite was deposited by electrohydrodynamic...
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