Molecular dynamics in semifluorinated side-chain polyesters as studied by broadband dielectric spectroscopy

Tsuwi, Julius; Hartmann, Lutz; Kremer, Friedrich; Pospiech, Doris; Jehnichen, Dieter; Häußler, Liane

doi:10.1016/j.polymer.2006.04.072

Cited by 10 publications

(11 citation statements)

References 45 publications

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“…The copolymers where the side chains are organized follow the additive rule, however the values in these samples are lower than those expected taking into account the value observed for the 11 of dielectric strength due to cancellation of dipole moments. A relaxation with similar characteristics has already been observed in systems having fluoroalkanes as side chains and has been ascribed to motions of CF 3 -groups [19,20,22,29].…”

Section: γ Sf Relaxationsupporting

confidence: 65%

“…Results of molecular dynamics have been reported for sf alkanes [15][16], as well as for various polymers with attached sf chains as side chains either as homopolymers [17][18][19][20] or as copolymers [21][22][23]. The molecular mobility of the chain backbone, as well as that of the sf side chains, ranging from local to segmental motions was followed and related to 28/[282] S. Kripotou et al the structure of the systems.…”

Section: Introductionmentioning

confidence: 99%

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Semifluorinated Methacrylate Random Copolymers: Phase Transitions and Molecular Dynamics

Kripotou

Pandis

Kyritsis

et al. 2015

Molecular Crystals and Liquid Crystals

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Random copolymers of methyl methacrylate (MMA) and sermifluorinated methacrylate (sfMA), with constant side chain length (H 10 F 10 ), as comonomers and various sfMA molar contents were studied by Dielectric Relaxation Spectroscopy (DRS) technique with respect to their phase transitions and molecular dynamics. DRS technique was proven a suitable technique for the detection of the phase transitions that take place in the systems under investigation, as it follows from the comparison with Differential Scanning Calorimetry (DSC) technique, which is traditionally used. Regarding molecular mobility, molecular motions of both the main chain and the sf side chains were followed, while different dynamics was recorded depending on the structure of the copolymers.

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Section: γ Sf Relaxationsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Semifluorinated Methacrylate Random Copolymers: Phase Transitions and Molecular Dynamics

Kripotou

Pandis

Kyritsis

et al. 2015

Molecular Crystals and Liquid Crystals

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“…Similarly to the α relaxation, the temperature dependence of the relaxation times can be described by the VFT law, indicating that the δ SF process is also a glass‐transition relaxation. From X‐ray scattering characterization,10–12, 27, 40 the SF side chains are found to microphase‐separate, forming nanodomains separated from the main chain. The δ SF relaxation can therefore be considered an independent glass transition of the SF domain.…”

Section: Resultsmentioning

confidence: 99%

“…More recent work has been devoted to obtaining additional understanding of the underlying dynamics of the materials, especially the backbone. A few investigations have been conducted with dendrimers,24–26 polyesters,27 and poly(styrene‐ b ‐butadiene)28 as backbones with SF side chains. It is the intention of this work to extend the studies to other backbone systems.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics in semifluorinated‐side‐chain polysulfone studied by broadband dielectric spectroscopy

Tsuwi

Pospiech

Jehnichen

et al. 2007

J of Applied Polymer Sci

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The molecular dynamics of a set of polysulfone polymers have been studied with broadband dielectric spectroscopy. The materials comprise main-chain polysulfones attached to semifluorinated (SF) oxydecylperfluorodecyl side chains. Through the analysis of the dielectric data together with information from differential scanning calorimetry and small-angle X-ray scattering, it can be shown that the oxydecylperfluorodecyl side chains are microphase-separated and form nanodomains with an independent dynamic glass-transition (d SF ) relaxation. In addition to the a process (which is the glass transition of the main chain), other relaxation processes can be detected with Arrhenius-type activation energies of 38-90 6 2 kJ/mol. A g SF process, observed only in polysulfone with SF side chains, can be assigned to librational fluctuations of the perpendicular component of the fluoroalkyl group. A g B relaxation reflects fluctuations of the dipole moments (O¼ ¼S¼ ¼O and C¼ ¼O) of the polymer, whereas a b process, with high activation energies (>70 6 2 kJ/mol), is assigned to packaging defects in the material. A detailed description of the processes is provided together with a proposed relaxation scheme.

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“…Several studies have examined the dielectric behavior of either MCLCPs or side chain liquid crystalline polymers (SCLCPs) [5][6][7][8][9][10][11][12][13], but few studies have been conducted on smectic C A MCLCP [11,14,15]. These investigations have demonstrated that LCPs exhibit multiple relaxations in both the glassy and liquid crystalline state(s).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of main-chain liquid crystalline polysiloxanes containing p-phenyleneterephthalate mesogens

Masser

Patil

Hedden

et al. 2010

Journal of Non-Crystalline Solids

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Molecular dynamics in semifluorinated side-chain polyesters as studied by broadband dielectric spectroscopy

Cited by 10 publications

References 45 publications

Semifluorinated Methacrylate Random Copolymers: Phase Transitions and Molecular Dynamics

Semifluorinated Methacrylate Random Copolymers: Phase Transitions and Molecular Dynamics

Molecular dynamics in semifluorinated‐side‐chain polysulfone studied by broadband dielectric spectroscopy

Dynamics of main-chain liquid crystalline polysiloxanes containing p-phenyleneterephthalate mesogens

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