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Ordered arrays of hollow carbon nanospheres and nanotubules were synthesized using polyacrylonitrile (PAN) as a carbon precursor and ordered mesoporous silicas with spherical pores (large-pore FDU-12) and cylindrical pores (ultra-large-pore SBA-15) as templates. PAN was grafted on the surface of the silica template using surface-initiated atom transfer radical polymerization (ATRP). The pore size...
In this paper we report a facile process to introduce ionic interactions to polypropylene (PP) based on Zn-neutralization and amine modification reactions of maleic anhydride grafted PP (PP-g-MAH) for the preparation of high melt strength PP (HMSPP). A series of PP ionomers with different structures and ionic properties were synthesized via the choice of the pendant groups, and their effects on the...
Polyvinyl chloride (PVC), a typical commodity thermoplastic polymer, is enabled for self-healing using nucleophilic thiol-click chemistry. A healing agent consisting of bifunctional monomer glycidyl methacrylate (GMA), polythiol pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) and basic catalyst 2,4,6-tris(dimethylaminomethyl) phenol (DMP-30) shows good wetting of the PVC matrix, fast reaction...
Two new donor–acceptor type of conjugated polymers derived from naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole) and dithieno[3,2-b:2′,3′-d]silole were prepared by Stille polymerization. The thermal, electrochemical and photophysical properties of these copolymers were studied. Both polymers have excellent thermal stability with decomposition temperature up to 430 °C. The copolymers show medium band...
In order to realize a more effective and environmentally friendly flame-retardant treatment for melamine foam, which is expected to be used as highly flame-retardant cellular polymeric materials for building and construction, a novel intumescent flame-retardant nanocoating, comprised of positively charged chitosan (CH) and negatively charged ammonium polyphosphate (APP), is deposited on high open-cell...
We report here a one-pot approach to achieve, for the first time, the simultaneous synthesis/anchorage of polymer monoliths in native PDMS channels. Monoliths consisting of ethylene glycol methacrylate phosphate (EGMP) and N,N′-methylene-bis-acrylamide (BAA) were synthesized within PDMS microchips through a photo-driven process. The EGMP monomer has never been employed for this purpose. To achieve...
Graphene-oxide-hybrided polyurethane/epoxy interpenetrating polymer networks (PU/EP IPNs) are prepared through an in-situ polymerization. The results showed that the mechanical performance of graphene-oxide-hybrided PU/EP IPNs is improved due to the formation of chemical bonds between graphene oxide nanosheet and polyurethane/epoxy segments, affording the loading transfer from polymer matrix to graphene...
Niobium complex was successfully introduced into atom transfer radical polymerization (ATRP) system as a new kind of recyclable photocatalyst. The niobium complex acted as photocatalyst that could be activated by the photoredox reaction under visible light irradiation and ethyl 2-bromoisobutyrate (EBiB) was used as initiator. Successful ATRP polymerizations of acrylates were realized. The well-defined...
We have investigated the dynamics of xanthan aqueous solutions with and without added salt (NaCl) by using laser light scattering (LLS) and analytical ultracentrifugation (AUC) via sedimentation velocity (SV). The fast and slow modes are observed in salt-free and low-salt xanthan solutions by dynamic light scattering (DLS). The scattering ratio (KC/Rs(q)) and apparent diffusion coefficient (Ds,app...
A series of benzocyclobutene-carbosilane thermosets derived from benzocyclobutene-containing oligomeric silylenephenylene (PBSEPs) were synthesized. DSC analysis results demonstrated that the reaction of PBSEPs presumably took place within the temperature range of 200–350 °C. FT-IR, 1 H NMR and 13 C NMR results demonstrated that this exothermic reaction was attributed to a [4 + 2]...
A series of efficient and spectrally stable blue light-emitting polyfluorene derivatives containing 3,7-dibenzothiophene-S,S-dioxide (SO) unit in main chain and oxadiazole (OXD) moiety in the side chain were synthesized via Suzuki copolymerization. It was realized that the glass transition temperatures of the resulted copolymers PFSO-OXD increased gradually with the content of OXD, while the UV-vis...
Two new 5,6-difluorobenzotriazole (FBTA)-oligothiophene copolymers PFBTA-3T and PFBTA-4T, comprising terthiophene (3T) and quaterthiophene (4T) on the backbone, respectively, were successfully synthesized. A new route to synthesize FBTA monomer was established. Polymers PFBTA-3T and PFBTA-4T exhibited good solubility in common organic solvents and good thermal stability. In comparison to poly (3-hexylthiophene),...
Nowadays, achieving a uniform dispersion of rod-like molecules (like carbon nanotube) in a polymer matrix is still a complicated and unsettled issue in polymer physics and chemical physics. It is very significant to fully understand the effects of deterministic factors on dispersion and aggregation processes of nanorods in the polymer matrix. Here, we adopt a coarse-grained molecular dynamics simulation...
The hydrogen bonded polymer complex bulk and thin film was prepared by solution mixing and layer-by-layer assembly, respectively. Poly(vinylpyrrolidone) (PVPON) and poly(ethylene oxide) (PEO) were hydrogen bonding acceptor polymers while poly(acrylic acid) (PAA) and poly(methacrylic acid) (PMAA) were hydrogen bonding donor polymers. The detachment of hydrogen bond between the chains in polymer complexes...
Poly(imino imino ketone) (PIIK) was synthesized via palladium-catalyzed C–N cross coupling reaction of 1,4-bis-(4′-bromobenzoyl) benzene and p-phenylenediamine. In view of its good thermal stability and solubility, PIIK foams with low density between 80 mg/cm3–350 mg/cm3 have been prepared via thermal induced phase separation and freeze-drying technology. The PIIK foam possessed high glass transition...
An alkylated skeleton of indeno[2,1-c]fluorene, viewed as a positional isomerism of indeno[1,2-b]fluorene, was developed to construct several conjugated oligomers and polymers through a Pd-catalyzed Suzuki coupling reaction for organic light-emitting diodes. Single crystal analysis indicated that the structure of indeno[2,1-c]fluorene was twisted due to close H---H contacts in the crowded region of...
Bowl-shaped particles in sub-micrometer scale represent an interesting platform for many potential applications. However, controlled fabrication of this special structure based on polymers still remains a big challenge. In the present study, a controllable sol–gel polymerization procedure was developed to precisely prepare bowl-shaped polysilsesquioxane particles. The morphology of particles can be...
Di(2-furyl)thiazolo[5,4-d]thiazole (DFTT) has been studied as building block for conjugated polymers. New polymer PBDTODFTT and PBDTTDFTT based on DFTT and two different benzo[1,2-b:4,5-b′]dithiophene (BDT) repeating units have been synthesized and applied as donors in bulk hetero-junction polymer solar cell devices. The polymer PBDTODFTT and PBDTTDFTT have optical bandgap of 2.00 eV and 1.98 eV,...
In order to improve the thermal stability of δ e form of sPS that possesses nanoporous structure, benzoylation of the phenyl groups was adopted and performed by solution procedure or solid procedure. The solution procedure involves initial benzoylation of sPS in solution and then preparing δ e form by solvent induction of benzoylated sPS; the solid procedure means benzoylation of δ...
A series of light-emitting conjugated polymers (LEPs) based on building blocks of electron-donating trifluoren-2-ylamine (TFA), electrically neutral 1,3,5-trifluoren-2-ylbenzene (TFB), and electron-withdrawing 2,4,6-trifluoren-2-yltriazine (TFT) were successfully synthesized via palladium-catalyzed Suzuki cross-coupling polycondensation. Their structure–property relationships were thoroughly studied...
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