Aggregation behaviour of a novel series of polyamidoamine-based dendrimers in aqueous solution

Yang, Hui; Shi-wei, Yang; Zhang, Wei; Tan, Guangyuan; Wang, Yilin; Wang, Jinben

doi:10.1080/10610270902980598

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…Characterization of PPP was carried out as described in our earlier work. 24 The molecular weight distribution of PPP was determined by gel permeation chromatography (GPC) using a set equipped with a Waters 515 pump, a Waters 2414 refractive index detector, and a combination of three Styragel columns (HT2, HT3, and HT4). Tetrahydrofuran was used as eluent at a flow rate of 1.0 mL • min -1 at 308.15 K. Polystyrene standards were used for calibration.…”

Section: Methodsmentioning

confidence: 99%

“…After cooling down to 333.15 K, phosphoric acid was added to neutralize the added catalyst, and the product was obtained. Characterization of PPP was carried out as described in our earlier work . The molecular weight distribution of PPP was determined by gel permeation chromatography (GPC) using a set equipped with a Waters 515 pump, a Waters 2414 refractive index detector, and a combination of three Styragel columns (HT2, HT3, and HT4).…”

Section: Methodsmentioning

confidence: 99%

“…To our knowledge, however, there is no report available. We have synthesized a series of PAMAM dendrimer based block copolymers and studied their aggregation properties in aqueous solutions in our earlier work. , To further our research, in the present work, we have characterized the aggregation behavior of an amphiphilic dendritic block copolymer (abbreviated as PPP) with a gemini surfactant (14-4-14) for the first time, with the methods of cloud point (CP), steady-state fluorescence (FL), dynamic light scattering (DLS), and transmission electron microscope (TEM). Interesting results from this study are expected to help us further understand the complex nature of copolymer−surfactant interactions from a fundamental point of view, which may be useful for potential applications.…”

Section: Introductionmentioning

confidence: 99%

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Aggregation Behavior of Amphiphilic Dendritic Block Copolymer with Butanediyl-α,ω-bis(tetradecyldimethylammonium bromide) in Aqueous Solution

Yang

et al. 2010

J. Chem. Eng. Data

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Aggregation behavior of an amphiphilic dendritic block copolymer, a generation 1.0 poly(amidoamine) (G1.0 PAMAM) dendrimer based poly(propylene oxide) (PPO)-block-poly(ethylene oxide) (PEO) copolymer that was abbreviated as PPP, with a cationic gemini surfactant butanediyl-R,ω-bis(tetradecyldimethylammonium bromide) (14-4-14) in aqueous solution was investigated by the measurements of steady-state fluorescence (FL), cloud point (CP), transmission electron microscope (TEM), and dynamic light scattering (DLS). Through FL method, the critical aggregation concentration (CAC) of PPP in the absence and presence of 14-4-14 was determined. As the concentration of 14-4-14 increases, CAC values increase, suggesting the participation of copolymer-surfactant complexes in aggregate formation. The CP temperature of PPP increases as the content of 14-4-14 increases in the mixed system, which indicates that 14-4-14 increases the solubility of PPP. From TEM and DLS, the morphology and size distribution of the aggregates were obtained. The spherical aggregates are found to be larger in size and narrower in distribution with the addition of 14-4-14, which confirms further the formation of mixed aggregates. All of the above are explained on the basis of strong interactions between PPP and 14-4-14. Through hydrophobic interactions, 14-4-14 molecules can associate with PPP molecules to form copolymer-surfactant complexes that can aggregate further.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aggregation Behavior of Amphiphilic Dendritic Block Copolymer with Butanediyl-α,ω-bis(tetradecyldimethylammonium bromide) in Aqueous Solution

Yang

et al. 2010

J. Chem. Eng. Data

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“…The previous studies (20)(21)(22)(23) show that the electrostatic repulsion of highly charged polymer chains could be shielded effectively by adjusting the charges in aqueous media, and the assembly morphology of these brush-like polymers could be well controlled by the addition of salt. Although some theoretical considerations on the selfassembly of statistical amphiphilic polymers (24,25) have been presented so far, there is no systematic study on the salt stimulus dependence of the molecular associative mode of the polymers with statistical or alternating sequences.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of brush-like amphiphilic statistical polymers: the effect of salt stimulus on the molecular associative mode

Wang

Yang

et al. 2012

Supramolecular Chemistry

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2013) Self-assembly of brush-like amphiphilic statistical polymers: the effect of salt stimulus on the molecular associative mode, Supramolecular Chemistry, 25:3, 151-157,The solution properties of amphiphilic statistical polymers, originating from the nanostructures of macromolecular assemblies, strongly depend on the associative behaviours of the polymers. In this paper, we report the effect of salt stimulus on the associative mode of the 2-(acrylamido)-2-methylpropanesulphonic acid -2-(acrylamido)-dodecane sulphonic acid brush-like amphiphilic statistical polymers, employing steady-state fluorescence, dynamic light scattering and transmission electron micrograph methods. It was found that the stimulus effects work more intensely for the polymers with less hydrophobic side chains. As the salt concentration increases, the salt valence state increases or the salt structure adds an organic group, the polymer molecules associate at a lower critical concentration. Meanwhile the molecules undergo an intramolecular associative mode in preference to an intermolecular associative mode, forming hundreds of times smaller unimers rather than giant multipolymer aggregates.

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“…In the investigation of salt effect and pH response on the series of polymers with poly(propylene oxide) (PPO)-block-poly(ethylene oxide) (PEO), we found that the hyperbranched amphiphiles are very surface active, of low aggregation concentration, and the aggregation behavior and aggregates conformation are sensitive to pH and salt [23][24][25]. With the increase of pH value, the hyperbranched polymer solution transformed from turbid to transparent, due to the protonation process of PAMAM; with the addition of inorganic salts, the hydration water molecules preferentially move from coordination shells of hyperbranched polymer molecules to the hydration layer of salt molecules; and the benzene ring of organic salt has a significant effect in increasing the size of complex aggregates, owing to penetrating into the hydrophobic core of aggregates.…”

Section: Introductionmentioning

confidence: 99%

Aggregation Behavior of Amphiphilic PAMAM-Based Hyperbranched Polymer in the Presence of Conventional Small Molecular Surfactants

Yang¹,

Yu²,

Wang³

et al. 2013

ACES

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Hyperbranched polymer composed of G1 polyamidoamine (PAMAM) and branched with poly (propylene oxide) (PPO)-block-poly (ethylene oxide) (PEO) was investigated to interact with sodium dodecyl sulfate (SDS) and di-dodecyl dimethyl ammonium bromide (DDAB), respectively, by the methods of turbidity titration and analysis, rheology measurements, dynamic light scattering (DLS) and transmission electron microscopy (TEM). It was noticeable that even at extremely low concentration of SDS (even far from the critical micelle concentration (cmc)), the system exhibits high turbidity, indicating that SDS molecules can insert into cationic amine groups and hydrophobic microenvironment, resulting in the formation of polymer-SDS complexes with large size. At the SDS concentration range of below 0.1 mM, the turbidity and cloud point (CP) temperature of the system keep almost invariable, mostly because of the repulsion between SDS molecules and the complexes. And, therefore, the size of the mixed aggregates retains almost constant. In the case of vesicle system of DDAB, the aggregates are in the size of 100 nm -200 nm and 500 nm -3000 nm at the concentrations of 30 mM and 100 mM, respectively. However, in the mixture of hyperbranched polymer with DDAB, by comparison, the size is smaller in a binary system than that of in DDAB system. So it is reasonable to infer that DDAB molecules remove from multilamellar vesicles of DDAB to the hydrophobic microenvironment of hyperbranched polymer aggregates, with the addition of the hyperbranched polymer. It leads to the destruction of the gel-like conformation in DDAB system, leading to the shear thinning of the mixture and, as a result, the viscoelastic character of the system is lost in a large degree.

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Aggregation behaviour of a novel series of polyamidoamine-based dendrimers in aqueous solution

Cited by 8 publications

References 23 publications

Aggregation Behavior of Amphiphilic Dendritic Block Copolymer with Butanediyl-α,ω-bis(tetradecyldimethylammonium bromide) in Aqueous Solution

Aggregation Behavior of Amphiphilic Dendritic Block Copolymer with Butanediyl-α,ω-bis(tetradecyldimethylammonium bromide) in Aqueous Solution

Self-assembly of brush-like amphiphilic statistical polymers: the effect of salt stimulus on the molecular associative mode

Aggregation Behavior of Amphiphilic PAMAM-Based Hyperbranched Polymer in the Presence of Conventional Small Molecular Surfactants

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