Effects of Side-Chain on Conformational Characteristics of Poly(3,5-Dimethyl-Phenyl Acrylate) in Toluene at 40℃

Hamidi, Nasrollah; Ihekweazu, Stanley; Wiredu, Christopher A.; Isa, Onize H.; Watley, Kevin; Rowe, Christopher C.; Nimmons, Briante’; Prezzy, Alexis; Govan, Traniqua; Scoville, Shane; Hills, Quentin; Salley, Judith D.

doi:10.4236/aces.2012.24053

Cited by 2 publications

(2 citation statements)

References 26 publications

(42 reference statements)

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“…Viscosity analysis is superior in that it can be applied to a wide molecular weight range. A Mark–Houwink (MH) plot is commonly used to evaluate molecular conformation from viscosity data. ,, It is a log–log plot of intrinsic viscosity [η] versus molecular weight, where the slope of the graph (referred to as “MH-a”) reflects the molecular conformation.…”

Section: Resultsmentioning

confidence: 99%

Molecular Weight Induced Conformational Change and Its Impact on β-Phase Formation of Polydiarylfluorene in Dilute Solution

et al. 2020

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Polyfluorene derivatives have a characteristic conformation called the "β-phase," with localized strong chain extension. Despite abundant research, the formation mechanism has not been fully clarified, particularly in the solution state. Using a gel permeation chromatography-static light scattering-viscometer integrated system, we investigated the β-phase formation mechanism of polydiarylfluorene (PODPF) in dilute solution. The formation was found to be sensitive to the molecular weight; it was significantly enhanced with lower molecular weight in a poor solvent. Molecular association was evident among the polymers that evinced prominent β-phase formation. Molecular weight induced conformational change (from rod-like to coil) was observed in the PODPF with increasing molecular weight. The conformational transition point lay at a rather high molecular weight, around 30 000, indicating that rod-like conformation in the lower molecular weight region enhances molecular association, resulting in the β-phase formation.

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Section: Resultsmentioning

confidence: 99%

Molecular Weight Induced Conformational Change and Its Impact on β-Phase Formation of Polydiarylfluorene in Dilute Solution

et al. 2020

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“…The conformation of a polymer chain was estimated using the Mark−Houwink (MH) equation:

true[η true] = K_{v} M^{a},

where M is the molecular weight, and Κ ν is a constant depending on the polymer species, solvent, and temperature. Exponent “ a ” is related to the molecular conformation:

0.5 < a < 0.8 flexible coil in good solvent

0.8 < a < 1.0 semiflexible coil

1.0 < a < 1.7 rod - like chain .

…”

Section: Resultsmentioning

confidence: 99%

Effect of molecular weight on conformational characteristics of poly(3-hexyl thiophene)

Nagai

Huang

Zhou

et al. 2017

J. Polym. Sci. Part B: Polym. Phys.

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This research focused on the effect of molecular weight and investigated the conformational characteristics of poly(3-hexyl thiophene) (P3HT). An integrated system consisting of a gel permeation chromatograph, a static light scattering unit, and a viscometer was used for the study. It also estimated the radius of gyration (R g ) values of unsubstituted poly(thiophene) (PT) chains computationally using rotational-isomericstates modeling and compared them with the experimental data for P3HT. In the low molecular weight region (20,000 to 30,000), both chains had nearly the same R g values, meaning that the effect of side-chains is limited. At higher molecular weights, the P3HT chains expanded more than the PT chains. In the molecular weight region from 20,000 to 60,000, both characteristic ratio and persistence length showed considerable molecular weight dependence. Beyond a molecular weight of 60,000, the molecular weight dependence decreased, and these parameters approached constant values, 16 and 3 nm, respectively.

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Effects of Side-Chain on Conformational Characteristics of Poly(3,5-Dimethyl-Phenyl Acrylate) in Toluene at 40℃

Cited by 2 publications

References 26 publications

Molecular Weight Induced Conformational Change and Its Impact on β-Phase Formation of Polydiarylfluorene in Dilute Solution

Molecular Weight Induced Conformational Change and Its Impact on β-Phase Formation of Polydiarylfluorene in Dilute Solution

Effect of molecular weight on conformational characteristics of poly(3-hexyl thiophene)

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