Hyperbranched polyethylenimine (HPEI) modified polyacrylonitrile fiber (PANF) was prepared through a water mediated hydrolysis and amidation reaction in an autoclave. The grafting amount of HPEI onto PANF could be modulated conveniently by varying the preparation conditions, such as temperature, time feed ratio to PANF. Young's modulus decreased with HPEI, especially when more HPEIs were grafted. As for PANF-g-HPEI low content, moduli similar before after loading AuNPs, whereas AuNPs...

The pyrolysis of a hyperbranched polyethylenimine (PEI) and glycerol mixture under microwaves generated the carbon dot (CD) functionalized with PEI (CD-PEI). Isobutyric amide (IBAm) groups were attached to CD-PEI through amidation reaction isobutyric anhydride moiety, which resulted in thermoresponsive CD-PEI-IBAm's. CD-PEI-IBAm's not only but also responded other stimuli, including inorganic salt, pH, loaded organic guests. cloud point temperature (Tcp) aqueous solutions could be modulated...

Novel thermoresponsive gold nanoparticles (AuNPs) with lower critical solution temperature (LCST) were obtained through the non-covalent interaction between a hyperbranched polyethylenimine isobutyramide groups (HPEI-IBAm) and citrate-protected AuNPs. The LCSTs of AuNPs could be conveniently modulated over broad range by altering molecular weight HPEI core, degree substitution (DS) IBAm HPEI-IBAm polymers or pH solution. used as recyclable responsive catalysts for reduction reaction...

Thermoresponsive gold nanoparticles (AuNPs) with lower critical solution temperature (LCST) adjustable over a broad range were explored to be potentially used as colorimetric sensors. Upon raising the above LCST surface plasmon resonance (SPR) peaks of obtained thermoresponsive AuNPs red-shifted sharply in narrow range, accompanied by color transition from transparent red purple–red until turbid red, which made them suitable sensitive sensors for detecting environmental variation. Moreover,...

The salt effects on the water solubility of thermoresponsive hyperbranched polyethylenimine and polyamidoamine possessing large amounts isobutyramide terminal groups (HPEI-IBAm HPAMAM-IBAm) were studied systematically. Eight anions with sodium as counterion ten cations chloride used to measure anion cation cloud point temperature (T(cp)) these dendritic polymers in water. It was found that T(cp) much more sensitive addition salts than traditional linear polymers. At low concentration,...

Hyperbranched polyethylenimine terminated with isobutyramide groups (HPEI-IBAm) was mixed 4-(phenylazo)benzoic acid (PABA) to form supramolecular complexes through the neutralization reaction between amino of HPEI-IBAm and carboxylic group PABA, which verified by 1H 2D NOESY NMR spectroscopy. The obtained a molar ratio PABA ≤8 were soluble in water exhibited thermoresponsive properties. Their cloud point temperature (Tcp) sensitive content, molecules exchanged hosts. topology polymer...

Oxidized graphene sheets (OGS) were treated with a hyperbranched polyethylenimine (PEI) under hydrothermal conditions to generate nanocomposites of quantum dots (GQDs) functionalized PEI (GQD–PEIs). The influence the reaction temperature and PEI/OGS feed ratio on photoluminescence properties GQD–PEIs was studied. obtained characterized by TEM, dynamic light scattering, elemental analysis, FTIR, zeta potential measurements 1H NMR spectroscopy, from which their structural information inferred....

Hyperbranched polyethylenimine (HPEI) was simply mixed with a solution of amphiphilic calix[4]arene (AC4), which possesses four phenol groups and aliphatic chains, in chloroform. This resulted the novel supramolecular complex HPEI-AC4 through noncovalent interaction amino HPEI AC4. The formed complexes were characterized by 1H NMR spectroscopy dynamic light scattering. cationic water-soluble dye methyl blue (MB) anionic orange (MO) used as model guests to test performance nanocarrier. It...

A PVIm-dot was prepared through a simple hydrothermal method using PVIm as sole carbon source without additives, which had both luminescence property and good catalytic activity.

Stimuli-responsive HPA-C4s integrated with thermal and pH sensitivity, reducible degradability intrinsic photoluminescence were successfully prepared characterized.

Three amino acid derivatives, GI, AI and VI resulted from the corresponding isobutyryl chloride modified Gly, Ala Val, were each conjugated with some of hydroxyl groups poly(vinyl alcohol) (PVA) through a one-step esterification reaction, resulting in PVA-GI, PVA-AI PVA-VI, respectively. FTIR 1H NMR verified successful conjugation these amino-acid derivative units onto PVA. X-ray diffraction characterization demonstrated that introduction led to decrease degree crystallinity. Turbidity...

Both dendritic and linear water-soluble polymers with plenty of hydroxyl or amino groups can be endowed thermoresponsive properties through partial modification the same amino-acid derivative.

Abstract Hazardous 4‐nitrophenol (4‐NP) has created serious threats to humans and the environment; therefore, it is highly desirable develop a facile practical method for monitoring of 4‐NP in environment food. Here, fluorescence based on modified polyethyleneimine‐capped carbon dots (mPEI‐CDs) was developed sensitive selective determination water, fruit, vegetable samples. First, fluorescent mPEI‐CDs (quantum yield about 40.3%) were easily synthesized via one‐step hydrothermal by using...

A photoluminescent nanocomposite of AgNC–PEI–TMA was multi stimuli-responsive, including toward temperature, salt, pH, and organic guest.