Synthesis and properties of click coupled graphene oxide sheets with three‐dimensional macromolecules

Mahapatra, Sibdas Singha; Ramasamy, Madeshwaran Sekkarapatti; Yoo, Hye Jin; Yi, Dong; Cho, Jae Whan

doi:10.1002/app.43358

Cited by 6 publications

(3 citation statements)

References 40 publications

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“…The incorporation of GO in the HBPU achieves a slight improvement in the thermal stability of the composites, as has been reported earlier . The thermal degradation of neat HBPU and the GO/HBPU composites are shown in Fig.…”

Section: Resultssupporting

confidence: 74%

Fabrication of graphene oxide and hyperbranched polyurethane composite via in situ polymerization with improved mechanical and dielectric properties

et al. 2017

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Herein, we report a simple and one‐pot route for the synthesis of graphene oxide (GO)/hyperbranched polyurethane (HBPU) composite by in situ polymerization technique. The polyurethane (PU) chains formed covalent linkages with the exposed hydroxyl and carboxylic acid groups on the GO. The composite was characterized by optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR) spectroscopy, and infrared (IR) spectroscopy. The characterization results revealed that the GO sheets were well dispersed within the HBPU matrix, resulting in very good enhancement in tensile strength and Young's modulus of the composites. Differential scanning calorimetry (DSC) suggests that the GO has a nucleating effect for the HBPU. The composites also show a mild increase in stability towards thermal degradation, and significantly, higher dielectric constant compared with neat HBPU at low frequencies. POLYM. COMPOS., 39:2765–2770, 2018. © 2017 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 74%

Fabrication of graphene oxide and hyperbranched polyurethane composite via in situ polymerization with improved mechanical and dielectric properties

et al. 2017

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“…Sodium azide (NaN 3 , Aldrich, 99%), tin(II) 2-ethylhexanoate (Sn(EH) 2 , Aladdin, 95%), 2-bromoisobutyryl bromide (Aladdin, 98%), PMDETA (Aldrich, 99%), Tris(2-(dimethylamino)ethyl)amine (Me 6 TREN, Aladdin, 98%), p -toluenesulfonic acid monohydrate (Aladdin, 98%), and methanol (Sinopharm, 99.8%) were used as received. Compounds I and II (AB 3 -type ATRP initiator) were prepared according to the published procedures.…”

Section: Methodsmentioning

confidence: 99%

How Does the Branching Effect of Macromonomer Influence the Polymerization, Structural Features, and Solution Properties of Long-Subchain Hyperbranched Polymers?

Hao

Duan

Yang³

et al. 2019

Macromolecules

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This work aims to elucidate how the branching effect of macromonomer influences the polymerization, structural features, and solution properties of AB n long-subchain hyperbranched polymers (LHPs). Our result reveals that compared with linear AB2 macromonomers, star AB3 macromonomers result in the suppression of chain extension, and the enhancement of macromonomer self-cyclization during the preparation of LHPs by “click” polymerization, due to the branching-enhanced steric hindrance effect. The combined triple-detection SEC and stand-alone LLS studies of unfractionated and fractionated AB3 LHPs unambiguously demonstrate their statistically fractal nature. Namely, the intrinsic viscosity ([η]) and radius of gyration (R g) are scaled to the macromonomer molar mass (M macro) and the total molar mass (M hyper) as [η] = K η ,AB3 M hyper νM macro μ (ν ≃ 0.39, μ ≃ 0, and K η ,AB3 ≃ 0.29 mL/g) and R g = H R ,AB3 M hyper α M macro β (α ≃ 0.47, β ≃ 0, and H R ,AB3 ≃ 3.6 × 10–2 nm). Surprisingly, [η] and R g are both almost independent of M macro (μ ≃ 0 ≃ β), indicating a similar draining property and local segment density for LHPs with different subchain lengths, which is different from the classic AB2 systems (μ ≃ 0.3 and β ≃ 0.1). A comparison of results for AB n LHPs (n = 2, 3) and short-subchain hyperbranched systems indicates that the fractal dimensions (f) for LHPs are generally smaller than short-subchain systems, whereas f is not sensitive to the local segment density or branching pattern. A combination of experimental observation and Langevin dynamics simulation of AB n dendrimers and LHPs further reveals (i) the segment back-folding phenomenon is prominent only for AB n (n ≥ 3) LHPs systems because it is mainly dominated by the macromonomer branching effect, rather than the internal subchain length, and (ii) the trend for segment interpenetration increases remarkably as M macro increases for both dendrimers and LHPs. The result also indicates that the unique synergistic effect of segment back-folding and segment interpenetration in AB3 system is the most probable reason for the observed M macro independent solution properties. Specifically, because of the unique synergistic effect, small macromonomer/oligomer chains can interpenetrate more easily into hyperbranched oligomer chains composed of longer subchains and subsequently “click” couple with the back-folded segments in the interior space of LHPs, which eventually could lead to a similar draining property and local segment density for AB3 LHPs with different subchain lengths.

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“…A new synthetic scheme for a tricationic alkyne is shown in Scheme . According to the literature, , the t CH 2 OH-alkyne was synthesized from pentaerythritol in three steps. Williamson ether synthesis between t CH 2 OH-alkyne and 1,2-bis(2-chloroethoxy)ethane under heterogeneous conditions in the presence of the phase transfer catalyst TBA·HSO 4 afforded t EG3-Cl-alkyne. , This reaction is the key to shortening the reaction route to the tricationic alkyne.…”

mentioning

confidence: 99%

Poly(ionic liquid)s Based on Copolymers of Poly(ethylene oxide) and Cationic Glycidyl Triazolyl Polymers with Tribranched Side Chains

Ikeda

2021

ACS Macro Lett.

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Copolymers comprising poly(ethylene oxide) and cationic glycidyl triazolyl polymer with tribranched side chains (PEO-co-GTP·3X) were synthesized from glycidyl azide copolymer (PEO-co-GAP) and the tricationic alkyne. A synthetic route for the tricationic alkyne was also improved. Bis(trifluoromethanesulfonyl)imide (TFSI) and bis(fluorosulfonyl)imide (FSI) were used as counteranions. Copolymers PEO-co-GTP·3TFSI and PEO-co-GTP·3FSI were characterized by NMR, IR, size exclusion chromatography, DSC, TGA, rheological, and impedance measurements. The NMR results suggested that the main chain of the copolymer was more flexible than that of the homopolymer. However, no major changes were detected in the glass transition temperature and ionic conductivity of the homopolymer and copolymer with TFSI counteranions. The counterion exchange from TFSI to FSI resulted in an increase in the storage modulus and complex viscosity because of the ionic association. Despite its unfavorable viscoelastic properties, PEO-co-GTP·3FSI exhibited higher ionic conductivity than PEO-co-GTP·3TFSI (3.9 × 10–5 S cm–1 at 25 °C under anhydrous conditions).

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Synthesis and properties of click coupled graphene oxide sheets with three‐dimensional macromolecules

Cited by 6 publications

References 40 publications

Fabrication of graphene oxide and hyperbranched polyurethane composite via in situ polymerization with improved mechanical and dielectric properties

Fabrication of graphene oxide and hyperbranched polyurethane composite via in situ polymerization with improved mechanical and dielectric properties

How Does the Branching Effect of Macromonomer Influence the Polymerization, Structural Features, and Solution Properties of Long-Subchain Hyperbranched Polymers?

Poly(ionic liquid)s Based on Copolymers of Poly(ethylene oxide) and Cationic Glycidyl Triazolyl Polymers with Tribranched Side Chains

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