A novel strategy to branched polyacrylonitrile via one‐pot RAFT copolymerization of acrylonitrile and an asymmetrical divinyl monomer

Liu, Xiaohui; Zhang, Gui-Bao; Li, Baixiang; Bai, Yilong

doi:10.1002/app.30599

Cited by 6 publications

(3 citation statements)

References 51 publications

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“…The use of LRP methods to synthesize polymers via SCVP − gives highly branched polymers of high molecular weights and narrower molecular weight distribution. ATRP and RAFT have also been used to mediate the copolymerization between mono- and divinyl monomers − to yield polymers with better defined structure than those obtained via conventional FRP Strathclyde synthesis.…”

Section: Introductionmentioning

confidence: 99%

A Simple Route to Functional Highly Branched Structures: RAFT Homopolymerization of Divinylbenzene

2011

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This work reports on a facile approach to the synthesis of highly branched polymers by the homopolymerization of commercially available divinyl benzene (DVB) via reversible additionÀ fragmentation chain transfer (RAFT) polymerization. The presence of RAFT agents allows conversions as high as 68% before crosslinking, instead of 15% for conventional free radical polymerization (FRP). The study extends this new approach by synthesizing starlike block copolymers of methyl acrylate (MA) and DVB by exploiting the living characteristic offered by RAFT polymerization. The resulting highly branched DVB polymers are used to produce in situ cross-linked polymeric particles following thermal stimuli. In addition, we exploit the large number of residual double bonds in the highly branched p(DVB) to further functionalize the polymer via thiolÀene click chemistry.

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Section: Introductionmentioning

confidence: 99%

A Simple Route to Functional Highly Branched Structures: RAFT Homopolymerization of Divinylbenzene

2011

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“…The solvent was evaporated in a hot air oven at 60 • C, resulting in a film with a thickness of 45 µm. The film was subsequently annealed at 135 • C [22].…”

Section: Methodsmentioning

confidence: 99%

Significant magnetoelectric coupling in P(VDF-TrFE)/48%NiFe bilayer laminate composite for energy harvesting applications

Xavier¹,

Kumar²,

Subramanian³

2022

J. Phys. D: Appl. Phys.

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A thick film of P(VDF-TrFE) piezoelectric polymer and a 48%nickel-iron (48%NiFe) alloy is employed to form a magnetoelectric (ME) layered composite to attain a ME coupling coefficient α ME as high as 1002 mV cm−1 Oe−1. Theoretical analysis indicates a significant strain transfer of close to 79%. Compared with P(VDF-TrFE)/nickel bilayer laminate composite, 48%NiFe alloy shows an enhancement of α ME by 53% due to the high piezomagnetic coefficient. Additionally, finite element methodology simulation using COMSOL® Multiphysics is used to corroborate the experimental results and theoretical estimates. The energy harvesting application is demonstrated by measuring the voltage from the laminate composite atop a small cooling fan, which produces a peak-to-peak ac voltage of 0.868 V. Comparative analysis with P(VDF-TrFE)/nickel bilayer laminate this value is 54% higher proving that the developed laminate composite is an efficient ME based energy harvester.

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“…Compared to other monomers, however, the number of reports on the RAFT‐polymerization of AN is low, which might be a result of the monomer's high reactivity and the low solubility of the polymer. Although the synthesis of low‐PDI PAN has been reported by some groups, current protocols suffer from low yields and/or low number‐average molecular weights well below 70,000 g/mol.…”

Section: Introductionmentioning

confidence: 99%

Carbon fibers prepared from tailored reversible‐addition‐fragmentation transfer copolymerization‐derived poly(acrylonitrile)‐co‐poly(methylmethacrylate)

Spörl

Ota

Beyer

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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Reversible-addition fragmentation-transfer (RAFT) polymerization of acrylonitrile (AN) was performed with 2-(2cyano-2-propyl-dodecyl)trithiocarbonate as RAFT agent and azobis(isobutyronitrile) as initiator. Linear polyacrylonitrile (M n 5 133,000 g/mol, PDI 5 1.34) was prepared within 7 h in 86% isolated yield. High-yield copolymerization with methyl methacrylate (MMA) was performed and copolymerization parameters were determined according to Kelen and T€ ud€ os at 90 C in ethylene carbonate yielding r AN 5 0.2 and r MMA 5 0.42. The molecular weights, polydispersity indices (PDIs), and MMA content of the copolymer were adjusted in a way that precursor fibers could be prepared via wet spinning. These precursor fibers had round cross-sections and a dense morphology, showing tenacities of 40-50 cN/tex and elastic moduli of 900-1000 cN/tex at a fineness of 1 dtex and an elongation of 13-17%. Precursor fibers were oxidatively stabilized and then carbonized at different temperatures. A maximum tensile strength of 2.5 GPa was reached at 1350 C. Thermal analysis, infrared and Raman spectroscopy, wide-angle X-ray scattering, scanning electron microscopy, and tensile testing were used to characterize the resulting carbon fibers.

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A novel strategy to branched polyacrylonitrile via one‐pot RAFT copolymerization of acrylonitrile and an asymmetrical divinyl monomer

Cited by 6 publications

References 51 publications

A Simple Route to Functional Highly Branched Structures: RAFT Homopolymerization of Divinylbenzene

A Simple Route to Functional Highly Branched Structures: RAFT Homopolymerization of Divinylbenzene

Significant magnetoelectric coupling in P(VDF-TrFE)/48%NiFe bilayer laminate composite for energy harvesting applications

Carbon fibers prepared from tailored reversible‐addition‐fragmentation transfer copolymerization‐derived poly(acrylonitrile)‐co‐poly(methylmethacrylate)

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