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A class of polyhedral oligomeric silsesquioxane (POSS)-based porous polymers containing typical π-conjugated units, including biphenyl, tetrahedral silicon-centered units and tetraphenylethene, have been prepared by Heck reactions of octavinylsilsesquioxane (OVS) with the corresponding brominated monomers. Two sets of reaction conditions were employed to retrieve their original appearance. These materials...
The present study focuses on the swelling behavior of copolymer microgels of N-isopropylacrylamide (NIPAM) and acrylic acid (AAc) containing different concentrations of acrylic acid. The incorporation of the comonomer is investigated by Fourier transform infrared (FT-IR) spectroscopy and an incorporation threshold value for the comonomer is found, if the “classical” Pelton synthesis approach is used...
Interpolymer complexes of homopolymer macromolecules are often described as ‘laddered’ or ‘ribbon’ type structures. The proposition of the existence of these ladder structures seems to us not reasonable and here we examine this hypothesis. To address this we have used polymers enabled for Förster Energy Transfer (FRET). Chromophores bound to a macromolecular backbone can transfer energy across short...
Carbon dots (CDs) is an area of intense focus, currently limited to unclear photoluminescence (PL) mechanism. Much effort has been made to clarify the certain PL centers but is still fruitless. Herein, a new type of polymer carbon dots (PCDs) with absolute quantum yield as high as 44.18% was synthesized by hydrothermally crosslinking polyacrylic acid and ethylenediamine. Through carefully comparing...
Conjugated tootbrush copolymers are prepared by connecting end-capped poly(9,9’-dioctylfluorene) (PF) side-chains (PF) to a poly(3-alkylthiophene) (P3AT) backbone via the CuAAC reaction. The ratio of grafted/nongrafted segment is varied. The influence of the covalent attachment of sidechains to the backbone on the self-assembly is studied by UV–vis spectroscopy. By excitation of the PF side-chains...
Hyperbranched polyethylenimine (HPEI) was modified with glycidol, resulting in hydroxyl terminated HPEI (HPEI-OH). Subsequently, HPEI-OH was used as the macroinitiator to initiate the anionic ring-opening polymerization of glycidol, realizing the hyperbranched grafting copolymer with HPEI as core and hyperbranched polyglycerol (HPG) as shell (HPEI-g-HPG) through the 'grafting from' method. The diagrams...
We have an ongoing interest in the design and control of helical conformation of water-soluble meta-linked poly(phenylene ethynylene)s (PPEs) and the further development of novel functional materials. Four cationic meta-linked PPEs (P1′-P4′) were synthesized to study the influence of differences in the backbone and side chain structure on their conformations. For P1′ and P4′ without side chains on...
The use of biopolymers in nanotechnologic applications, e.g. as coatings, is often limited by their suboptimal nanomechanical properties. Here we used an atomic force microscopy (AFM) based approach to study the elastic properties and thickness of surface supported DOPC membranes containing varying amounts of bolalipids (C20BAS) at the nanoscale. We found that increasing amounts of bolalipids led...
Star-shaped macromolecules decorated with fluorescence moieties such as pyrene and anthracene have been developed, which exhibit aggregation enhanced excimer emission (AEEE). The presented star-shaped macromolecules showed only weak emissions in the visible region in dilute solution, due to the predominance of the monomer emission, which has its maximum in the UV-A region of the spectrum. However,...
Perylene bisimides (PBIs) possess high fluorescence quantum yields, high extinction coefficients, and high chemical and photophysical stability. However, their poor water-solubility limits their potential biomedical applications. In this work, we show a facile one-step condensation method to synthesize PBI-incorporated polyurethanes (HDI-PBI-PEG) from hexamethylene diisocyanate (HDI), PBI, and poly(ethylene...
Two novel D-A polymers containing pyridine with vinylene spacer, P1 and P2 were synthesised through Heck polymerisation. In both the polymers, pyridine is linked with two donor phenylene at position-4 and -6, and electron withdrawing cyano group at position-3. Additionally, P1 possess methoxy side chain at position-2 of 3-cyanopyridine and P2 is flanked with both methoxy and octyloxy side chain at...
Acceptor-substituted polycarbazoles (PCzTPAN) and polytriphenylamines (PTPATPAN) bearing electron-deficient 2,3,3-triphenylacrylonitrile (TPAN) side groups have been successfully synthesized. Both of them are aggregation-induced emission (AIE)-active and show intramolecular charge transfer (ICT) behavior. PCzTPAN and PTPATPAN aggregates in 90% water/THF were used for the detection of 1,3,5-trinitrobenzene...
In the present work, we have demonstrated size- and distance-dependent excitation energy transfer (EET) phenomenon from polymer-bound fluorophores to gold nanoparticles (GNPs) conjugated to the same polymer. Anthracene labeled two block copolymers of controlled block length were synthesized by reversible-addition fragmentation chain transfer (RAFT) polymerization technique using two-arm dithioester...
Two novel water-soluble hyperbranched poly(p-phenyleneethynylene)s (HBP1′ and HBP2′) bearing different contents of oligo(ethylene oxide) (OEO) side chains with ammonium end groups were synthesized by the facile “A 2 + B 2 (or A 2 ′) + C 3 ” protocol based on Sonogashira polymerization. Their linear analog (LP2′) was also synthesized for comparative investigation. The...
A series of poly(arylene ethynylene)s (PAEs) containing tbutyl pyrene in the main chain were synthesized for nitroaromatic sensors. As control, similar polymers containing unsubstituted pyrene were also synthesized. The sensory properties of the polymers were studied towards various nitroaromatic compounds like trinitrotoluene (TNT), dinitrotoluene (DNT), nitrotoluene (NT), nitrobenzene (NB) and picric...
Sulfide anions are generated not only as a byproduct from industrial processes but also in biosystems. Hence, fluorescent probes for detecting sulfide anion which are water soluble, sensitive, selective and biocompatible are highly sought-after. In this study, we report a water-soluble, low-cytotoxic and sensitive fluorescent sensor for detecting sulfide anion. In this probe, the strong electron-withdrawing...
Poly(1,4-phenylene vinylene) (PPV) has drawn a great deal of attention in the last two decades because of their applications in areas such as light-emitting diodes. To improve the solubility and optoelectronic properties, various PPV derivatives have been synthesized and investigated for their light-emitting performance. Among PPV derivatives, poly(2,3-diphenyl-1,4-phenylenevinylene) (DP-PPV) and...
A polymer sensor (P1) containing benzodiazaborole moieties for recognition of cyanide anion and sulfonate groups for water-solubility was synthesized by Suzuki cross-coupling polymerization, which enables cyanide detection in aqueous solution. The polymer showed visible fluorescence quenching upon exposure to cyanide anion concentrations as low as ∼2 μM. Selective detection of cyanide anions can be...
Multicompartment polymeric micelles (MPMs) have attracted broad interest, due to their intriguing advantages. Although a plethora of MPMs have been designed recently, characterization of the fine hierarchical compartmented structure and dynamic conformation change of MPMs are still challenging. In this contribution, we reported a strategy to detect thermo-induced structure rearrangement of one kind...
The synthesis of an anionically-functionalized, hyperbranched conjugated polymer with sulfonic acid end groups is presented. Due to the presence of sulfonate groups in the hyperbranched polymer, the electrostatic interaction with viologen-based cation has a major impact on the quenching of the polymer. The electrostatic complex dissociates into individual molecules upon addition of cyanide anions,...
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