Hyperbranched and Highly Branched Polymer Architectures—Synthetic Strategies and Major Characterization Aspects

Voit, Brigitte; Lederer, Albena

doi:10.1021/cr900068q

Cited by 1,094 publications

(1,021 citation statements)

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“…21 Hyper-branched polymers have gained considerable attention because of their highly branched and nonentangled architecture as well as a large number of terminal groups, which can facilitate further modification with a target polymer via covalent linkage. 22,23 Additionally, hyper-branched polymers are prepared by an A2B3 type polymerization that monomer "A" has two functional group and monomer "B" possesses three functional groups. It is well-known that N-aminoethyl piperazine (AEPZ) is an effective vinyl-reactive agent via Michael addition reaction; meanwhile, it can be conjugated onto GO using amino-coupling reaction.…”

Section: Introductionmentioning

confidence: 99%

Effect of Functionalized Graphene Oxide with Hyper-Branched Flame Retardant on Flammability and Thermal Stability of Cross-Linked Polyethylene

Hu¹,

Jin²,

Wang³

et al. 2014

Ind. Eng. Chem. Res.

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In this work, GO was functionalized by a hyper-branched flame retardant, which was synthesized by the reaction of N-aminoethyl piperazine and di(acryloyloxyethyl)methylphosphonate. Subsequently, the resultant functionalized GO (FGO) was incorporated into the cross-linked polyethylene (XLPE) to enhance the flame retardancy of the matrix. Transmission electron spectroscopy images indicated that FGO exhibited uniform dispersion in XLPE matrix and strong adhesion with the matrix by crosslinking, which improved barrier effect due to reduced heat release and the free radical transfer between the matrix and graphene nanosheets. The incorporation of FGO into XLPE matrix endowed polymer composites with flame retardancy and thermal stability. In addition, the homogeneous dispersion of functionalized GO with a hyper-branched flame retardant in the polymer matrix improved the antioxidation and mechanical properties of XLPE−FGO nanocomposites compared to the XLPE− GO samples, as demonstrated through the oxidative induction temperature and time test, oven ageing test and mechanical test.

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Section: Introductionmentioning

confidence: 99%

Effect of Functionalized Graphene Oxide with Hyper-Branched Flame Retardant on Flammability and Thermal Stability of Cross-Linked Polyethylene

Hu¹,

Jin²,

Wang³

et al. 2014

Ind. Eng. Chem. Res.

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“…Hyperbranched polymers (HBP) have been reported, and they have high solubility compared with the corresponding linear ones. [24–34] Since insoluble polymers are not suitable for permselective membranes materials, we selected HBP of PAZ (= HBP-PAZ ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of soluble oligsiloxane-end-capped hyperbranched polyazomethine and their application to CO₂/N₂ separation membranes

Lei

Jing

et al. 2018

Designed Monomers and Polymers

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Three soluble hyperbranched polyazomethines containing oligosiloxane end group HBP-PAZ-SiOn were successfully synthesized. HBP-PAZ-SiOns were used as modifiers of ethyl cellulose (EC) and polysulfone (PS) membranes. Blend membranes, HBP-PAZ-SiOn/EC and HBP-PAZ-SiOn/PS were prepared by blending the THF solution of HBP-PAZ-SiOn with ethanol solution of EC and dichloromethane solution of PS, respectively. Surprisingly, the permeabilities for CO2 of the blend membranes were more than 15–16 times higher than those of pure EC and PS membranes without any drop of pemselectivity to N2. This unusual improvement has been achieved by both enhancement of diffusivity for carbon dioxide and nitrogen by the oligosiloxane groups and enhancement of affinity of the amino groups with carbon dioxide at the end groups of HBP-PAZ-SiOn.

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“…The development of simple homopolymers to copolymers, including block copolymers and their associated polymer topologies, would further expand the versatile possibilities in polymer science. For example, compared with linear polymers, corresponding topological polymers, 1-9 such as star polymers, 10,11 cyclic polymers, 12-14 dendrimers 15 and hyperbranched polymers, 16 generally have a smaller hydrodynamic volume and lower viscosity in solution and less polymer entanglement in bulk. These properties are useful in solid materials and can help to not only reduce the amount of solvent to afford sustainable materials but also make the molding process easy because of the low melt viscosity.…”

Section: Introductionmentioning

confidence: 99%

Topology-transformable polymers: linear–branched polymer structural transformation via the mechanical linking of polymer chains

Takata

Aoki

2017

Polym J

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In this review article, we discuss the synthesis and dynamic nature of macromolecular systems that have mechanically linked polymer chains capable of undergoing a topology transformation driven by a rotaxane molecular switch. The rotaxane linking of polymer chains plays a crucial role in these systems. A linear polymer possessing a crown ether/sec-ammonium salt-type [1] rotaxane moiety at the axle chain terminal was prepared via the rotaxane linking of a single polymer chain. A linear-cyclic polymer topology transformation was achieved via the movement of the wheel component from one end to the other end of the axle component using the rotaxane macromolecular switch function. The successful synthesis of a macromolecular [2]rotaxane (M2R) possessing a single polymer axle and one crown ether wheel led to a variety of unique applications, such as the development of topology-transformable polymers and the synthesis of rotaxane crosslinked polymers (RCPs). The introduction of a polymer chain to the wheel component of M2R (rotaxane linking of two polymer chains) produced a rotaxane-linked AB block copolymer that transformed its topology from linear to branched. Furthermore, a rotaxane-linked three-component polymer and an ABC triblock copolymer were synthesized and transformed to the corresponding 3-arm star (co)polymers, and the transformation was confirmed by measuring the hydrodynamic volume change. The structural transformation of 4-arm and 6-arm star polymers was also accomplished using the dynamic mobility of a similar rotaxane. As a useful application, M2R-based vinylic crosslinkers (RCs) were prepared and applied to the synthesis of RCPs, whereby the addition of RCs into radical polymerization systems of vinyl monomers afforded polymers with excellent toughness by enhancing both of tradeoff properties that cannot be achieved using typical covalent crosslinkers.

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Hyperbranched and Highly Branched Polymer Architectures—Synthetic Strategies and Major Characterization Aspects

Abstract: Scheme 1. Schematic Representation of the Synthesis of hb Polymers through the AB x and AB x + B y Approach (x g 2; Here, 2; y g 3; Here, 3)

Cited by 1,094 publications

References 514 publications

Effect of Functionalized Graphene Oxide with Hyper-Branched Flame Retardant on Flammability and Thermal Stability of Cross-Linked Polyethylene

Effect of Functionalized Graphene Oxide with Hyper-Branched Flame Retardant on Flammability and Thermal Stability of Cross-Linked Polyethylene

Synthesis of soluble oligsiloxane-end-capped hyperbranched polyazomethine and their application to CO₂/N₂ separation membranes

Topology-transformable polymers: linear–branched polymer structural transformation via the mechanical linking of polymer chains

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Hyperbranched and Highly Branched Polymer Architectures—Synthetic Strategies and Major Characterization Aspects

Abstract: Scheme 1. Schematic Representation of the Synthesis of hb Polymers through the AB x and AB x + B y Approach (x g 2; Here, 2; y g 3; Here, 3)

Cited by 1,094 publications

References 514 publications

Effect of Functionalized Graphene Oxide with Hyper-Branched Flame Retardant on Flammability and Thermal Stability of Cross-Linked Polyethylene

Effect of Functionalized Graphene Oxide with Hyper-Branched Flame Retardant on Flammability and Thermal Stability of Cross-Linked Polyethylene

Synthesis of soluble oligsiloxane-end-capped hyperbranched polyazomethine and their application to CO2/N2 separation membranes

Topology-transformable polymers: linear–branched polymer structural transformation via the mechanical linking of polymer chains

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Synthesis of soluble oligsiloxane-end-capped hyperbranched polyazomethine and their application to CO₂/N₂ separation membranes