Supramolecular Self-Assembly of Inclusion Complexes of a Multiarm Hyperbranched Polyether with Cyclodextrins

Zhu, Xinyuan; Chen, Shuangtao; Yan, Deyue; Chen, Qun; Yao, Yefeng; Xiao, Yan; Hou, Jian; Li, Jingye

doi:10.1021/la035740a

Cited by 88 publications

(70 citation statements)

References 17 publications

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“…[65][66][67] Hyperbranched polymers have also been grown from linear polymers to form diblock, 68 gridlock 69,70 and graft copolymers. 41,71,72 Hyperbranched polymers have also been prepared from one or more oligomeric monomers to yield products that have additional flexibility. [73][74][75][76] Although the concentrated functionality of a dense hyperbranched polymer is desirable in applications such as fuel cell membranes, additional entanglements are necessary to avoid poor blend compatibility and leaching.…”

Section: Preparation Of Hyperbranchedàlinear Pes Multiblock Copolymersmentioning

confidence: 99%

Hyperbranched poly(ether sulfone)s: preparation and application to ion-exchange membranes

Kakimoto

Grunzinger

Hayakawa

2010

Polym J

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Hyperbranched polymers possess unique characteristics such as low viscosity, high solubility in organic solvents and a high degree of functionality at the terminal position. However, hyperbranched polymers also possess weak mechanical properties. In this study, hyperbranched poly(ether sulfone)s (HBPES) possessing sulfonic acid moieties at the terminal position were prepared by reacting electrophilic sulfonium ions with electron-rich benzene rings from two kinds of AB 2 monomers. To address the weakness of HBPES, hybrid materials containing linear and hyperbranched PES were investigated. Linear and hyperbranched multiblock copolymers were successfully prepared by reacting oligomeric linear PES and AB 2 monomers. From the multiblock copolymers, linear and hyperbranched PES blends were prepared and applied as ion-exchange membranes for fuel cells. Films containing various ratios of linear and hyperbranched PES terminated by sulfonyl chloride groups were prepared via casting from a solution of DMAc. The results indicated that tethers between linear and hyperbranched polymers were important for controlling the size of the phases and for preventing the dissolution of HBPES in water; thus, linear and hyperbranched polymers were crosslinked by simply heating blends of both films. Finally, hybrid films containing sulfonic acid groups were obtained by hydrolyzing the sulfonyl chloride moieties. The resultant films showed ion-exchange capacities that were comparable to that of a Nafion 117 membrane (Dupont, Tokyo, Japan).

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Section: Preparation Of Hyperbranchedàlinear Pes Multiblock Copolymersmentioning

confidence: 99%

Hyperbranched poly(ether sulfone)s: preparation and application to ion-exchange membranes

Kakimoto

Grunzinger

Hayakawa

2010

Polym J

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“…CH 2 Cl 2 was purified before use. 3-Ethyl-3-(hydroxymethyl)-oxetane (EHO) was prepared according to the literature procedure [19] . The cationic polymerization of EHO was conducted under a nitrogen atmosphere in a four-necked round-bottomed flask equipped with a PTFE stirrer, funnel, and thermometer.…”

Section: Synthesis Of Hyperbranched Poly(3-ethyl-3-(hydroxymethyl)oxementioning

confidence: 99%

Using 2D NMR to determine the degree of branching of complicated hyperbranched polymers

Zhu

Chen

et al. 2008

Sci. China Ser. B-Chem.

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Degree of branching (DB) is a crucial structure parameter of hyperbranched polymers, which can be determined by 1 H NMR, quantitative 13 C NMR, degradative method, etc. However, for complicated hyperbranched polymers, intricate structure and severe overlap of spectral signals hinder the determination of DB using traditional methods. In this work, the architecture of complicated hyperbranched polymers has been elucidated with the help of 2D NMR techniques. Using such a method, overlapped NMR signals can be well separated into a two-dimensional space, and additional structural information is also available. Correspondingly, quantitative analysis for complicated systems can be realized. Determination of DBs for three types of complicated hyperbranched polymers synthesized from step-polymerization, self-condensation vinyl polymerization and self-condensation ring-opening polymerization is shown as examples.hyperbranched polymer, degree of branching, 2D NMR The dendritic structure is now accepted as the fourth major polymer architecture following the linear, cross-linked and branched structures [1] . Due to their unique physical and chemical properties, such as good solubility, low viscosity and numerous terminal groups, dendritic polymers have potential applications in the fields of rheology, materials processing, drug delivery, self-assembly, catalyst, energy transfer, etc. As one important subclass of dendritic polymers, hyperbranched polymer can be easily synthesized by one-pot methodology using commercially available monomers [2][3][4][5][6] . However, the irregular structure of hyperbranched polymer also brings about some new problems. For example, uncertainty in the architecture of hyperbranched polymers is a basic problem to be solved. As many studies have demonstrated that the properties of hyperbranched polymers are strongly correlated with their branched structure, defining and determining the dendritic structure parameter of the hyperbranched polymer is a key step for its application. Nowadays, the degree of branching (DB) has been widely used to describe the average topological architecture of highly branched polymers.Historically, in nearly 50 years before the popular term "hyperbranched polymer" was put forward by Webster and Kim [7] , Flory [8] had developed the concept of "degree of branching (DB)". In 1991, Fréchet et al. [9] presented the widely accepted definition of DB. After that, Frey [10] , Yan et al. [11] gave the modified definitions of DB respectively. The most common method of DB determination is based on the one-dimensional nuclear magnetic resonance (1D NMR) technique [9] . By characterization of a series of model compounds on highresolution 1D NMR spectroscopy, characteristic peaks

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“…Hyperbranched polymers are frequently used as the core of core-shell block copolymers, with the shell block grown from the functional groups of the hb polymer [23][24][25][26]. They have also been grown from linear polymers to form diblock [27], triblock [28][29][30], and graft copolymers [31][32][33]. It is believed that the terminal groups of hb polymers can greatly affect the macromolecular properties, such as the glass transition temperature, solubility, dielectric properties, hydrophobicity, and thermal stability [34].…”

Section: Introduction To Hyperbranched Polymersmentioning

confidence: 99%

Aromatic Hyperbranched Polymers: Synthesis and Application

Ghosh

Banerjee

Voit

2014

Porous Carbons – Hyperbranched Polymers – Polymer Solvation

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Hyperbranched (hb) polymers have been receiving increasing attention because of their unique architecture that results in an interesting set of unusual chemical and physical properties. Over the past decade quite a number of excellent reviews on hb polymers have been published by different research groups, covering various aspects of this class of polymers. This review will highlight the work on aromatic hb polymers of the last decade, emphasizing general synthetic strategies and recent development of alternative synthetic strategies, and discussing various aspects of hb polymers to demonstrate their wide range of applications.

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Supramolecular Self-Assembly of Inclusion Complexes of a Multiarm Hyperbranched Polyether with Cyclodextrins

Cited by 88 publications

References 17 publications

Hyperbranched poly(ether sulfone)s: preparation and application to ion-exchange membranes

Hyperbranched poly(ether sulfone)s: preparation and application to ion-exchange membranes

Using 2D NMR to determine the degree of branching of complicated hyperbranched polymers

Aromatic Hyperbranched Polymers: Synthesis and Application

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