Highly <i>cis</i>‐1,4‐selective polymerization of isoprene achieved using neodymium chloride 8‐hydroxyquinolines

Wang, Zhonghua; Qian, Yongqiang; Zhang, Wenjuan; Wang, Jiye; He, Lixia; Qing-ju, Lin; Sun, Wen‐Hua

doi:10.1002/pi.4911

Cited by 14 publications

(7 citation statements)

References 21 publications

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“…After polymerization, the existence of the C–H bending vibration of methylene at 1444 cm –1 , −CC stretching vibration of trisubstituted olefin at 1666 cm –1 , C–H stretching vibration of methylene at 2854 and 2927 cm –1 , and C–H stretching vibration of methyl in the PI chain at 2962 cm –1 clearly verifies the successful grafting NSP–CQDs- g -PI x . These results are in good agreement with other related works. , …”

Section: Resultssupporting

confidence: 94%

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“Grafting from” Enabled Stretchable and Highly Fluorescent Carbon Quantum Dot–Polyisoprene Elastomers

Laysandra

Getachew

Chang

et al. 2023

ACS Appl. Polym. Mater.

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Achieving polymer nanocomposites with improved elasticity and stable mechanical and fluorescence properties remains challenging due to the aggregation tendency of fluorescent carbon nanomaterials, particularly for a polymer with no functional groups. To alleviate the aforementioned issues, the “grafting from” method can be employed via covalent bonding design. Herein, we exploit the “grafting from” method coupled with reversible fragment-added chain transfer polymerization to construct soft polyisoprene (PI) chains onto a photostable nitrogen, sulfur, and phosphorus-doped carbon quantum dot (NSP–CQD) surface for the preparation of flexible fluorescent NSP–CQDs-grafted-polyisoprene (NSP–CQDs-g-PI x ) nanocomposite films. By tuning the molecular weight of PI in NSP–CQDs-g-PI x (x = 8, 13, and 18 kg mol–1), the elastic and mechanical properties can be tailored. Upon an intense tensile cyclic test, the NSP–CQDs-g-PI18K generates remarkable elasticity, indicated by the absence of permanent deformation or residual strain even after multiple loading–unloading tests up to 50 times. Moreover, compared with the blending method that tends to cause reduced photoluminescence properties due to the NSP–CQD agglomeration, the grafting method intelligibly maintains the fluorescence property. This study concludes that “grafting from” is a feasible method for fabricating CQD-loaded composites, which have great potential to meet the demand for advanced stretchable and flexible organic electronic devices.

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Section: Resultssupporting

confidence: 94%

“…It is well known that the impeccable elastic ability of natural rubber is due to its high content of 1,4-addition (>99%) . Although the content of 1,4-addition PI (∼87%) in all of our composites is less than that of natural rubber, it still can afford an acceptable elastic behavior, as shown in Figure b.…”

Section: Resultsmentioning

confidence: 76%

“Grafting from” Enabled Stretchable and Highly Fluorescent Carbon Quantum Dot–Polyisoprene Elastomers

Laysandra

Getachew

Chang

et al. 2023

ACS Appl. Polym. Mater.

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“…Compared to the early transition metal catalysts, Co(II) and Fe(II) complexes attracted more attention due to their low oxophilicity, good moisture tolerance, and easy to synthesis. Recently, some elegant examples of Co complexes have been reported . Diverse ancillary ligands, such as N^N^N, N^N^O, N^C^N, N^N, O^P architectures were designed and synthesized.…”

Section: Introductionmentioning

confidence: 99%

Iminoimidazole‐based Co(II) and Fe(II) complexes: Syntheses, characterization, and catalytic behaviors for isoprene polymerization

Zhang

Zhu

Mahmood

et al. 2019

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

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A stereoselectivity switchable polymerization of isoprene has been developed, which is catalyzed by iminoimidazole‐Co(II) and ‐Fe(II) complexes. The influence of substituents ranging from electron donating to the electron withdrawing on the iminoimidazole‐Co(II) and ‐Fe(II) catalysts is investigated for isoprene polymerization. Two sets of iminoimidazole‐Co(II) and ‐Fe(II) complexes have been prepared and fully characterized. X‐ray crystallography analysis reveals that the complexes Co1 and Fe1 adopt distorted tetrahedral geometries. In the presence of AlEt2Cl as co‐catalyst, all the Co(II) complexes are active and the catalytic activity is highly dependent on the molar ratio of Al/Co. All the Co(II) complexes exhibit higher activities at low Al/Co ratio. Compared with the Co(II) complexes, the Fe(II) complexes are essentially inactive under the identical condition. However, on activation with combination of AlEtCl2 and [Ph3C][B(C6F5)4], both Co(II) and Fe(II) complexes display high activities with good conversions of isoprene (up to >99%). Additionally, low molecular weight and high trans‐1,4‐unit (>96%) selectivity are characteristics of the resultant polyisoprene. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 767–775

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“…37 Stereoregular polyisoprenes containing ∼ 96% of 1,4-cis units were synthesized by various neodymium chloride hydroxyquinolines (24, Figure 7) in good yields. 38 Polymerizations were activated by i-Bu 3 Al and MAO, while MAO offered only negligible activity in standard polymerization conditions (50 °C, hexane, Al/Nd = 40). 38 It was shown that the catalytic system based on lanthanum catalyst (C 5 Me 5 )La(BH 4 ) 2 (THF) 2 (25, Figure 7) combined with n-BuEtMg and/or i-Bu 3 Al provided access to statistical copolymers of β-myrcene (7-methyl-3-methylene-octa- diene) with styrene and isoprene, and terpolymers consisting of these three monomers (Scheme 6).…”

Section: Coordinative Chain Transfer Polymerizationmentioning

confidence: 99%

Coordinative Chain Transfer and Chain Shuttling Polymerization

Mundil,

Bravo,

Merle

et al. 2023

Chem. Rev.

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Coordinative chain transfer polymerization, CCTP, is a degenerative chain transfer polymerization process that has a wide range of applications. It allows a highly controlled synthesis of polyolefins, stereoregular polydienes, and stereoregular polystyrene, including (stereo)block as well as statistical copolymers thereof. It also shows a green character by allowing catalyst economy during the synthesis of such polymers. CCTP notably allows the end functionalization of both the commodity and stereoregular specialty polymers aforementionned, control of the composition of statistical copolymers without adjusting the feed, and quantitative formation of 1-alkenes from ethene. A one-pot one-step synthesis of the original multiblock microstructures and architectures by chain shuttling polymerization (CSP) is also an asset of CCTP. This methodology takes advantage of the simultaneous presence of two catalysts of different selectivity toward comonomers that produce blocks of different composition/microstructure, while still allowing the chain transfer. This affords the production of highly performant functional polymers, such as thermoplastic elastomers and adhesives, among others. This approach has been extended to cyclic esters' and ethers' ring-opening polymerization, providing new types of multiblock microstructure. The present Review provides the state of the art in the field with a focus on the last 10 years.

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Highly cis‐1,4‐selective polymerization of isoprene achieved using neodymium chloride 8‐hydroxyquinolines

Cited by 14 publications

References 21 publications

“Grafting from” Enabled Stretchable and Highly Fluorescent Carbon Quantum Dot–Polyisoprene Elastomers

“Grafting from” Enabled Stretchable and Highly Fluorescent Carbon Quantum Dot–Polyisoprene Elastomers

Iminoimidazole‐based Co(II) and Fe(II) complexes: Syntheses, characterization, and catalytic behaviors for isoprene polymerization

Coordinative Chain Transfer and Chain Shuttling Polymerization

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