Synthesis and characterization of precisely-defined ethylene-co-aryl ether polymers via ADMET polymerization

Song, Shaofei; Miao, Weijun; Wang, Zongbao; Gong, Dirong; Chen, Zhong‐Ren

doi:10.1016/j.polymer.2015.03.039

Cited by 19 publications

(15 citation statements)

References 47 publications

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“…Neutral polymers bearing spacers identical to those between phosphonium units in P1‐P8 all have excellent thermal stability ( T d > 400 °C) and so their presence was not expected to diminish the inherent thermal stability of their composite TPELs. As anticipated, the T d values for P1 ‐ P8 are all relatively high, ranging from 355 to 441 °C.…”

Section: Resultsmentioning

confidence: 99%

Convenient synthetic route to tetraarylphosphonium polyelectrolytes via palladium‐catalyzed P–C coupling of aryl triflates and diphenylphosphine

Wan

Yang

Smith

2017

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

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A series of eight tetraarylphosphonium polyelectrolytes (TPELs) has been successfully synthesized by polymerization of diphenylphosphine and bis(aryl triflate)s. The bis(aryl triflate)s are readily prepared from bisphenols, some of which are commodity feedstocks such as bisphenol A. The polymerization via palladium catalyzed P-C bond formation produces degrees of polymerization up to 65. All polymeric triflates have reasonable thermal stability in the range of 350-450 8C. The stability of the TPELs to alkaline solution is strongly depending on the spacer between adjacent phosphonium sites. Polymers with electron-releasing and bulky substituent para-to the phosphonium site have improved stability while those with electron-withdrawing substituent para-to phosphonium site have decreased alkaline stability due to decomposition via a nucleophilic aromatic substitution pathway. These findings have important ramifications for the design of ionomers for alkaline exchange membrane fuel cells and related electrochemical energy conversion devices.

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Section: Resultsmentioning

confidence: 99%

Convenient synthetic route to tetraarylphosphonium polyelectrolytes via palladium‐catalyzed P–C coupling of aryl triflates and diphenylphosphine

Wan

Yang

Smith

2017

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

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“…22,23 Interestingly, cyclic defects like phenylene and cyclohexylene in the backbone of PE showed good crystallinity and high melting points. 24,25 Furthermore, other sterically demanding cyclic defects as phenylene- and cyclohexylene ethers 26−28 in the main chain of PE have been analyzed with wide- and small-angle X-ray scattering (WAXS and SAXS, respectively). These defects were proven to be included in the PE lattice.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Precision Poly(1,3-adamantylene alkylene)s via Acyclic Diene Metathesis Polycondensation

et al. 2019

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Fully saturated, aliphatic polymers containing adamantane moieties evenly distributed along the polymer backbone are of great interest due to their exceptional thermal stability, yet more synthetic strategies toward these polymers would be desirable. Herein, we report for the first time the synthesis of poly(1,3-adamantylene alkylene)s based on α,ω-dienes containing bulky 1,3-adamantylene defects precisely located on every 11th, 17th, 19th, and 21st chain carbon via acyclic diene metathesis polycondensation. All saturated polymers revealed excellent thermal stabilities (452–456 °C) that were significantly higher compared to those of structurally similar polyolefins with aliphatic or aromatic ring systems in the backbone of polyethylene (PE). Their crystallinity increases successively from shorter to longer CH2 chains between the adamantane defects. The adamantanes were located in the PE crystals distorting the PE unit cell by the incorporation of the adamantane defect at the kinks of a terrace arrangement. Precise positioning of structural defects within the polymeric backbone provides various opportunities to customize material properties by “defect engineering” in soft polymeric materials.

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“…Melting at 122.8 C and 142.9 C indicate a melting-recrystallization, which can be due to formation of metastable crystals during the cooling process. 55 Such crystals are melting rst and reorganizing again into more stable areas resulting in an exothermal signal in the DSC curve. These areas are melting later, similar to the behavior found for precision polyolenes with different functional groups acting as defects.…”

Section: Dsc Analysismentioning

confidence: 99%

Precision polymers containing main-chain-amino acids: ADMET polymerization and crystallization

2017

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Synthesis and characterization of precisely-defined ethylene-co-aryl ether polymers via ADMET polymerization

Cited by 19 publications

References 47 publications

Convenient synthetic route to tetraarylphosphonium polyelectrolytes via palladium‐catalyzed P–C coupling of aryl triflates and diphenylphosphine

Convenient synthetic route to tetraarylphosphonium polyelectrolytes via palladium‐catalyzed P–C coupling of aryl triflates and diphenylphosphine

Synthesis of Precision Poly(1,3-adamantylene alkylene)s via Acyclic Diene Metathesis Polycondensation

Precision polymers containing main-chain-amino acids: ADMET polymerization and crystallization

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