Influence of Branching Architecture on Polymer Properties

Zhu, Xinyuan; Zhou, Yongfeng; Yan, Deyue

doi:10.1002/9780470929001.ch12

Cited by 9 publications

(8 citation statements)

References 81 publications

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“…The topological and/or architectural differences can have a large impact on the molecular behavior. Different chemical and physical properties, such as density [ 8 ], hydrodynamic size [ 8 , 9 , 10 , 11 , 12 ], viscosity [ 13 , 14 , 15 , 16 , 17 ], glass transition temperature [ 18 ], strength [ 19 ], and the dynamics [ 20 ], are affected by chain topology and/or architecture [ 21 , 22 ]. Scattering techniques present a great opportunity to study the intra-molecular cross-linking effects on SCNPs systems at a molecular level.…”

Section: Introductionmentioning

confidence: 99%

Collective Motions and Mechanical Response of a Bulk of Single-Chain Nano-Particles Synthesized by Click-Chemistry

et al. 2020

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We investigate the effect of intra-molecular cross-links on the properties of polymer bulks. To do this, we apply a combination of thermal, rheological, diffraction, and neutron spin echo experiments covering the inter-molecular as well as the intermediate length scales to melts of single-chain nano-particles (SCNPs) obtained through ‘click’ chemistry. The comparison with the results obtained in a bulk of the corresponding linear precursor chains (prior to intra-molecular reaction) and in a bulk of SCNPs obtained through azide photodecomposition process shows that internal cross-links do not influence the average inter-molecular distances in the melt, but have a profound impact at intermediate length scales. This manifests in the structure, through the emergence of heterogeneities at nanometric scale, and also in the dynamics, leading to a more complex relaxation behavior including processes that allow relaxation of the internal domains. The influence of the nature of the internal bonds is reflected in the structural relaxation that is slowed down if bulky cross-linking agents are used. We also found that any residual amount of cross-links is critical for the rheological behavior, which can vary from an almost entanglement-free polymer bulk to a gel. The presence of such inter-molecular cross-links additionally hinders the decay of density fluctuations at intermediate length scales.

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Section: Introductionmentioning

confidence: 99%

Collective Motions and Mechanical Response of a Bulk of Single-Chain Nano-Particles Synthesized by Click-Chemistry

et al. 2020

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“…First, the properties of hyperbranched polymers depend on polymer architecture, like the number of generations, the distance between the branching points and the size of the core region. Second, the chemical nature of the terminal groups has a large impact on the properties of these tunable molecules [4,5,6,7,8,9]. Unlike dendrimers, they can easily be synthesized via one-step reactions [10].…”

Section: Introductionmentioning

confidence: 99%

Tuneable extraction systems based on hyperbranched polymers

Goetsch

Zimmermann

Enders

et al. 2016

Chemical Engineering and Processing: Process Intensification

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“…HPSi-IFR is synthesized through the condensation reaction between P−Cl in SPDPC and an amino group in AHPSi, as shown in Figure 1. As a hyperbranched polymer usually shows a threedimensional distribution, 32,33 and the molecular chains of SPDPC act as bridges for linking the dendritic or linear units of hyperbranched polysiloxane, consequently, HPSi-IFR shows a three-dimensional structure with a high molar mass. Figure 2 shows FTIR spectra of SPDPC, AHPSi, and HPSi-IFR.…”

Section: Resultsmentioning

confidence: 99%

Flame Retardancy and Mechanism of Bismaleimide Resins Based on a Unique Inorganic–Organic Hybridized Intumescent Flame Retardant

Yang

Liang

et al. 2013

Ind. Eng. Chem. Res.

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To completely overcome three critical disadvantages of traditional intumescent flame retardants, a unique hybridized intumescent flame retardant (HPSi-IFR) with three-dimensional structure was synthesized, which has amine groups and Si and P elements. HPSi-IFR has very high thermal stability under either a nitrogen or air atmosphere. With a small addition of HPSi-IFR, the modified bismaleimide/diallyl bisphenol A (BDM/DBA) resin has significantly improved flame retardancy. With only 5 wt % addition of HPSi-IFR into BDM/DBA resin, the residue at 800°C increases 23.1 wt %; meanwhile, the heat release capacity, the total heat release, and the maximum heat release are only 67, 55, and 63% of those of BDM/DBA resin, respectively. To reveal the mechanism behind the attractive flame retarding effect of HPSi-IFR, the char formation chemistry and thermodegradation kinetics were intensively studied. Results show that HPSi-IFR greatly improves the ability of producing a stable and condensed barrier that prevents the heat and mass transfer.

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Influence of Branching Architecture on Polymer Properties

Cited by 9 publications

References 81 publications

Collective Motions and Mechanical Response of a Bulk of Single-Chain Nano-Particles Synthesized by Click-Chemistry

Collective Motions and Mechanical Response of a Bulk of Single-Chain Nano-Particles Synthesized by Click-Chemistry

Tuneable extraction systems based on hyperbranched polymers

Flame Retardancy and Mechanism of Bismaleimide Resins Based on a Unique Inorganic–Organic Hybridized Intumescent Flame Retardant

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