Effect of Degree of Branching on the Self-Assembly of Amphiphilic Hyperbranched Multiarm Copolymers

Cheng, Haixing; Yuan, Xijing; Sun, Xiaoyi; Li, Kunpeng; Zhou, Yongfeng; Yan, Deyue

doi:10.1021/ma902452p

Cited by 62 publications

(54 citation statements)

References 60 publications

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“…Thus, there is great difference in the performance between 3D molecules and linear molecules . Hyperbranched polymers, as a class of typical 3D dendritic globular architectures, have received great attention due to the advantages of a large population of terminal functional groups, lower viscosity and better solubility . For these reasons, hyperbranched structures have great potential applications in improving energy, mechanical properties and processability of energetic materials.…”

Section: Introductionmentioning

confidence: 99%

Core–shell type multi‐arm azide polymers based on hyperbranched copolyether as potential energetic materials in solid propellants

Zhang

et al. 2017

Polymer International

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A series of novel multi-arm azide copolymers (POGs) with the same hyperbranched poly[3-ethyl-3-(hydroxymethyl)oxetane] core (PEHO-c) and different content of linear glycidyl azide polymer shell (GAP-s) have been synthesized by sequential cationic ring-opening polymerization and azidation. Detailed structural information of these copolyethers was deduced from Fourier transform infrared, 1 H NMR and inverse gated decoupled 13 C NMR spectroscopies, matrix-assisted laser desorption ionization time-of-flight mass spectrometry, gel permeation chromatography and elemental analysis. The molecular weight of POG having GAP-s and PEHO-c with a molar ratio 14.95:1 (R s/c ) was around 31 000 g mol −1 , far above that of linear GAP (around 4000 g mol −1 ). The apparent viscosity and glass transition temperature (−51 to −23 ∘ C) decreased first and then slightly increased with increasing molecular weight. Thermal analysis revealed that all the obtained POGs exhibited excellent resistance to thermal decomposition up to 220 ∘ C. Moreover, the energetic properties, investigated using oxygen bomb calorimetric measurements, indicated that the enthalpy of formation of the POGs was higher than that of general linear GAP, but similar to that of branched GAP under reasonable R s/c . The compatibilities of the POGs with common materials used in solid propellants were studied using differential scanning calorimetry and the results indicated that the POGs had good compatibility with these materials.

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Section: Introductionmentioning

confidence: 99%

Core–shell type multi‐arm azide polymers based on hyperbranched copolyether as potential energetic materials in solid propellants

Zhang

et al. 2017

Polymer International

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“…Degree of branching (DB) is one of the most important intrinsic parameters of hyperbranched polymers, which evaluates the branching density and has great influence on the physical and chemical properties of hyperbranched polymers [21, 22]. DB lies between 0 and 1, a higher value indicates more branched structure [23].…”

Section: Resultsmentioning

confidence: 99%

Preparation and properties of addition curable silicone resins with excellent dielectric properties and thermal resistance

Zhang

Zhuo

et al. 2011

Polymer Engineering & Sci

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A new addition curable silicone resin (ASiR) system with excellent dielectric and thermal properties was developed, which consists of only two components: poly(methylphenylvinylsiloxane) (PMPVSi) and an end‐capped hydrogen‐functionalized hyperbranched polysiloxane (EHFHPSi). PMPVSi is synthesized by a green and controllable process; EHFHPSi is first synthesized via A2 + B3 approach, and then end‐capped by hexamethyldisiloxane (HMDS). Three formulations were designed to investigate the optimum stoichiometry. Results show that cured ASiR resins have greatly different dielectric and thermal properties because of the different chemical structure of cured networks resulting from the different stoichiometries. The resin with a suitable stoichiometry has not only excellent dielectric properties including extremely low dielectric constant (2.96 at 1 Hz) and loss (0.0003 at 1 Hz) as well as good stability on frequency, but also outstanding thermal resistance, exhibiting great potential to be used as a new kind of high‐performance resins for many cutting‐edge industries, especially the microelectronic and insulation fields. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers

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“…For example, in the self-assembly of HBPOstar-PEO, with the increase of the DB in HBPO cores, the polymers changed from the linear polymer brushes to spherical hyperbranched star copolymers, while the self-assembly structures changed from spherical micelles to rods to vesicles (Fig. 4) [15]. Such an example can illustrate the "topological amplification effects" of HBPs in the self-assembly process.…”

Section: Structure or Morphology Diversitymentioning

confidence: 96%

Self-Assembly of Hyperbranched Polymers

Zhou

Yan

2013

Encyclopedia of Polymeric Nanomaterials

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Effect of Degree of Branching on the Self-Assembly of Amphiphilic Hyperbranched Multiarm Copolymers

Cited by 62 publications

References 60 publications

Core–shell type multi‐arm azide polymers based on hyperbranched copolyether as potential energetic materials in solid propellants

Core–shell type multi‐arm azide polymers based on hyperbranched copolyether as potential energetic materials in solid propellants

Preparation and properties of addition curable silicone resins with excellent dielectric properties and thermal resistance

Self-Assembly of Hyperbranched Polymers

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