Solution Properties of 1,3-Cyclohexadiene Polymers by Laser Light Scattering and Small-Angle Neutron Scattering

Yun, Seok Il; Terao, Ken; Hong, Kunlun; Melnichenko, Yuri B.; Wignall, G. D.; Britt, Phillip F.; Mays, Jimmy W.

doi:10.1021/ma052022h

Cited by 17 publications

(14 citation statements)

References 19 publications

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“…Taking into account that the Kuhn segment length of PCHD (90/10) block is higher than that of the PCHD (50/50) block, it was concluded that these differences between the two interaction parameters χ PS‐PCHD(50/50) and χ PS‐PCHD(90/10) originate only from enthalpic factors such as the z ‐effect (where z represents the number of segment–segment contacts per lattice area) . The same group reported also that for PS‐ b ‐PCHD (90/10) diblock copolymers with ϕ PS ∼ 0.45 there is a relatively small area, where the cylindrical morphology becomes more stable than the lamellar, when the conformational asymmetry parameter ε is increased and that the rigid semiflexible PCHD block (majority block) will form the core.…”

Section: Resultsmentioning

confidence: 98%

Diblock copolymers of polystyrene‐b‐poly(1,3‐cyclohexadiene) exhibiting unique three‐phase microdomain morphologies

Misichronis

Chen

Kahk

et al. 2016

J Polym Sci B Polym Phys

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ABSTRACT:The synthesis and molecular characterization of a series of conformationally asymmetric polystyrene-blockpoly(1,3-cyclohexadiene) (PS-b-PCHD) diblock copolymers (PCHD: 90% 1,4 and 10% 1,2), by sequential anionic copolymerization high vacuum techniques, is reported. A wide range of volume fractions (0.27 / PS 0.91) was studied by transmission electron microscopy and small-angle X-ray scattering in order to explore in detail the microphase separation behavior of these flexible/semiflexible diblock copolymers. Unusual morphologies, consisting of PCHD core(PCHD-1,4)-shell(PCHD-1,2) cylinders in PS matrix and three-phase (PS, PCHD-1,4, PCHD-1,2) four-layer lamellae, were observed suggesting that the chain stiffness of the PCHD block and the strong dependence of the interaction parameter v on the PCHD microstructures are important factors for the formation of this unusual microphase separation behavior in PS-b-PCHD diblock copolymers. V C 2016

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Section: Resultsmentioning

confidence: 98%

Diblock copolymers of polystyrene‐b‐poly(1,3‐cyclohexadiene) exhibiting unique three‐phase microdomain morphologies

Misichronis

Chen

Kahk

et al. 2016

J Polym Sci B Polym Phys

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“…The [ η ] of a wormlike chain may be calculated from the touched‐bead wormlike chain model based on the following

true[η true] = \frac{f true(λ L, λ d_{B} true)}{(λ^{2} M_{normalL})}

where L , λ −1 , and d B are the contour length, the Kuhn segment length, and the diameter of a bead, respectively. L is related to M w by

L = M_{w} / M_{L}

, for which M L is the molar mass per unit contour length of the polymer chain.…”

Section: Resultsmentioning

confidence: 99%

Solution properties, unperturbed dimensions, and chain flexibility of poly(1‐adamantyl acrylate)

Yin

Osa

et al. 2017

J Polym Sci B Polym Phys

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Poly(1‐adamantyl acrylate) (PAdA) exhibits much higher glass transition and degradation temperatures than other polyacrylates. However, the quantitative evaluation of the stiffness of this polymer chain has not been reported previously. In this study, the dilute solution properties and conformational characteristics of PAdA were evaluated using viscometry and scattering techniques. The unperturbed dimensions of this polymer were evaluated using the Burchard–Stockmayer–Fixman extrapolation and the touched‐bead wormlike chain model. The PAdA chain has a comparable persistence length, diameter per bead and characteristic ratio to poly(methyl methacrylate) and polystyrene. All these results indicate that PAdA is less flexible than common polyacrylates. In addition, the second virial coefficients (A2) of PAdA in different solvents obtained by static light scattering were compared. Among the solvents investigated, tetrahydrofuran is a moderate solvent. Radius of gyration of a polymer sample in the various solvents ranged from 16.8 to 30.3 nm. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1526–1531

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“…At 120 C, the conductivity decreases by more than two orders of magnitude for XPCHD_SPCHD_H2 but less than two orders of magnitude for Nafion ® NRE-212, as RH decreases from 100 to 20%. As compared with Nafion ® , the stronger conductivity dependence on RH of XPCHD_SPCHD_H2 is suggested to result from its semi-rigid polymer backbone [17,18], which makes organization of sulfonic acid groups into contiguous structures to form continuous, hydrophilic, hydrogen-bonded proton conducting pathways more difficult. Due to its stronger conductivity dependence on hydration, XPCHD_SPCHD_H2 exhibits higher proton conductivity at 30 C than Nafion NRE-212 in the range of RH of 100 to 70%, the crossover point of the curves.…”

Section: Membrane Proton Conductivitymentioning

confidence: 99%

Hydrocarbon-based fuel cell membranes: Sulfonated crosslinked poly(1,3-cyclohexadiene) membranes for high temperature polymer electrolyte fuel cells

Deng

Hassan

Mauritz

et al. 2015

Polymer

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a b s t r a c tHigh temperature fuel cell membranes based on poly(1,3-cyclohexadiene) were prepared by a Polymerization-Crosslinking-Sulfonation (PCS) approach, and a broad range of membrane compositions were achieved using various sulfonating reagents and reaction conditions. Membranes were characterized for their proton conductivity and thermal degradation behavior. Some of the membranes showed up to a 68% increase in proton conductivity as compared to Nafion under the same conditions (100% relative humidity and 120 C). Thermogravimetric analysis revealed that these membranes are thermally stable up to 200 C. High proton conductivity and thermal stability, combined with much lower cost as compared to Nafion ® , make these materials potentially interesting as fuel cell membranes, although they are chemically vulnerable under fuel cell operation conditions.

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Solution Properties of 1,3-Cyclohexadiene Polymers by Laser Light Scattering and Small-Angle Neutron Scattering

Cited by 17 publications

References 19 publications

Diblock copolymers of polystyrene‐b‐poly(1,3‐cyclohexadiene) exhibiting unique three‐phase microdomain morphologies

Diblock copolymers of polystyrene‐b‐poly(1,3‐cyclohexadiene) exhibiting unique three‐phase microdomain morphologies

Solution properties, unperturbed dimensions, and chain flexibility of poly(1‐adamantyl acrylate)

Hydrocarbon-based fuel cell membranes: Sulfonated crosslinked poly(1,3-cyclohexadiene) membranes for high temperature polymer electrolyte fuel cells

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