Self‐Assembly of Large Multimolecular Micelles from Hyperbranched Star Copolymers

Hong, Haiyan; Mai, Yiyong; Zhou, Yongfeng; Yan, Deyue; Cui, Jun

doi:10.1002/marc.200600752

Cited by 186 publications

(162 citation statements)

References 36 publications

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“…Hyperbranched poly(3-ethyl-3-(hydroxymethyl)oxetane (HBPO) functionalized with bromoester or trithiocarbonate moieties has been used to synthesize PDMAEMA stars by ATRP [25][26][27] and reversible addition fragmentation polymerization [28]. In addition, Yan et al [29] studied the anionic polymerization of DMAEMA using hydroxyl terminated HBPO, reacted with potassium hydride, as the macroinitiator.…”

Section: Introductionmentioning

confidence: 99%

Polycationic star polymers with hyperbranched cores for gene delivery

Mendrek

Sieroń

Libera

et al. 2014

Polymer

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Core-shell type stars synthesized via atom transfer radical polymerization were used for the delivery of nucleic acids. The interior of the stars consisted of hyperbranched poly(arylene oxindole), while the arms were composed of poly(N,N-dimethylaminoethyl methacrylate).The length of the star arms varied in degree of polymerization (DP) from 14 to 98. The hydrodynamic radius of the structures measured in water indicated the presence of small aggregates, while isolated stars ranging in size from 14 to 29 nm were seen in organic solvent.The phase transition temperatures of the stars in water, measured in basic conditions, were shifted to lower values with increasing DP of the arms. Stable polyplexes of stars with plasmid DNA were formed. Their size varied from 300 nm to 400 nm, depending upon the DP of arms. The zeta potential of the polyplexes was positive, which facilitated their cellular uptake. The DP of the arms influenced the transfection efficiency of HT-1080 cells, demonstrating that stars are promising candidates for synthetic gene vectors.

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Section: Introductionmentioning

confidence: 99%

Polycationic star polymers with hyperbranched cores for gene delivery

Mendrek

Sieroń

Libera

et al. 2014

Polymer

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“…Furthermore, some large aggregates (sizes of approximately 300-350 nm) coexisted with small spherical micelles. The formation of partial, large, complex aggregates might have been due to the further assembly of small aggregates in close proximity induced by hydrogen bonding or van der Waals interactions among the hydrophilic shells with a number of ethoxy chains [32,38,39]. The formation of dumbbell-like aggregates (see Fig.…”

Section: Surface Activities and Aggregation Properties Of Surfactantsmentioning

confidence: 99%

A gemini-type superspreader: Synthesis, spreading behavior and superspreading mechanism

Lin

Wang

Bai

et al. 2017

Chemical Engineering Journal

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Please cite this article as: A gemini-type superspreader: synthesis, spreading behavior and superspreading mechanism, Chemical Engineering Journal (2016), doi: http://dx.doi.org/10. 1016/j.cej.2016.12.132 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ABSTRACTThis paper describes the facile microwave-assisted synthesis of a series of trisiloxane gemini superspreaders, as well as their surface and aggregation properties and superspreading behavior on plant leaf surfaces. The molecular structures of the trisiloxane gemini surfactants were characterized by Fourier transform infrared spectroscopy (FTIR) and 1 H nuclear magnetic resonance spectroscopy ( 1 H NMR). The obtained thermodynamic parameters showed that an increase in the spacer group (CH 2 ) resulted in decreases in the critical aggregation concentration (CAC), corresponding surface tension (γ CAC ), and surface excess concentration (Γ max ) but increases in the occupied area per surfactant molecule (A CAC ) and absolute values of the standard free energies of aggregation (△G θ mic ) and adsorption (△G θ ads ). An increase in ethoxy units (CH 2 -CH 2 -O-) resulted in increases in the CAC, γ CAC , and A CAC but decreases in Г max and the absolute values of △G θ mic and △G θ ads . The transmission electron microscopy and dynamic light scattering results showed that the average sizes of the aggregates of superspreader solutions increased with an increasing number of spacer units (CH 2 ) but decreased with an increasing number of ethoxy units (CH 2 -CH 2 -O-). The dynamic spreading behavior results demonstrated that the average spreading velocity increased with increasing spacer chain length, and the dependence of the maximum spreading velocity on the ethoxy chain length was nonmonotonous with a maximum at n(EO) = 8.68. The optimal HLB value was essential to obtaining good superspreading behavior, and the substrate wettability (hydrophobic rice plant and hydrophilic mango plant surfaces) greatly influenced the superspreading. The synergistic effects from the precursor film and Marangoni effect existed in the proposed superspreading model.

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“…Thus, it is expected that HPG 17 and HPG 4 -RBr 13 form unimolecular micelles at low concentration, and probably multimolecular aggregates at higher polymer concentration. The aggregation of unimolecular micelles to form multimolecular aggregates has been demonstrated for hyperbranched star copolymers [18].…”

Section: Characterization Of Polymer Aggregatesmentioning

confidence: 99%

“…Self-assembling HBPs are formed by hydrophobic (hydrophilic) dendritic core and hydrophilic (hydrophobic) arms. A multimolecular aggregate mechanism driven by intermolecular interaction between hydrophobic arms has been proposed to explain the formation of large aggregates over 100 nm [18,19].…”

Section: Introductionmentioning

confidence: 99%