Thermotropic Mesophases in Element-Organic Polymers

Godovsky, Yu. K.; Папков, В. С.; Dušek, Karel

doi:10.1007/bfb0017966

Cited by 95 publications

(48 citation statements)

References 70 publications

(67 reference statements)

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“…These mesophases, named as condis-crystal or hexagonal columnar mesophase, are partly disordered crystalline modifications in thermodynanic equilibrium. They are formed by parallel packed macromolecules in extended macroconformation, main and side chains being conformationally disordered [3,4]. Similar types of mesophases were observed in some linear and cyclolinear polyorganosiloxanes [3,4].…”

Section: Introductionmentioning

confidence: 65%

“…The phase behavior in bulk of poly[bis-(2,2,3,3-tetrafluoropropoxy)phosphazene] (PFP-C3), poly[bis-(2,2,3,3,4,4,5,5-octafluoropentoxy)phosphazene] (PFP-C5) and poly[bis- (2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptoxy)phosphazene] (PFP-C7) was studied in Refs. 5 and 6, which was shown to be determined by an interplay between the packing of macromolecules on the whole and the registering of side groups.…”

Section: Introductionmentioning

confidence: 99%

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Structural Characterization of Self-Organized Mono- and Multilayers of Partly Fluorinated Polydialkoxyphosphazenes at the Air/Water Interface

et al. 2017

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Abstract.We report studies of the collapse of monolayers of mesomorphic poly [bis-(2,2,3,3,4,4,5,5-octafluoropentoxy)phosphazene] and poly [bis-(2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptoxy)phosphazene]. The structure of the films has been examined at different stages of the collapse process by synchrotron grazing incidence X-ray diffraction. Surface pressure-surface area isotherms show that these films undergo a stepwise collapse with formation of multilayers. Grazing incidence X-ray diffraction reveals only one diffraction peak for the monolayer as well as for multilayers of the two polymers studied, which corresponds to an in-plane interchain spacing d = 15.2±0.1˚Å and 17.6±0.5˚Å, respectively. The in-plane correlation length ξxy reaches ca. 500 Å for PFP-C5 (33 macromolecules) and ca. 400 Å for PFP-C7 (23 macromolecules), implying a certain mesoscale order similar to a quasi-long-range one.

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Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Structural Characterization of Self-Organized Mono- and Multilayers of Partly Fluorinated Polydialkoxyphosphazenes at the Air/Water Interface

et al. 2017

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“…As a result, mesogenic properties are closely coupled with the polymeric properties. Considering the fact that the polymer chain conformation is dominated by the conformation of the flexible spacer, an alteration of the flexible group may influence the molecular packing into a mesophase and thereby resulting in a structure and properties that will depart from those of the low molecular weight mesogens (Godovsky et al 1989). A number of liquid crystalline main chain polymers, such as: polyesters ( Fig.…”

Section: Main Chain Liquid Crystalline Polymersmentioning

confidence: 99%

Side Chain Liquid Crystalline Polymers: Advances and Applications

Reddy

Jayaramudu

Ray

et al. 2015

Liquid Crystalline Polymers

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Matters comprise of molecules that exist in three different phases-solids, liquids and gases depending on their arrangement. The arrangement of molecules in a crystalline solid leads to long-range positional and orientational orders. In isotropic liquid, on the other hand, the molecules are arranged randomly and possess no order and flow freely. However, it was observed that a certain class of molecules organise in a different manner in order to exhibit a new phase, popularly known as liquid crystalline phase. Molecules in liquid crystalline phase self-organize, leading to positional/orientation order. Macroscopically, the liquid crystalline phase exhibits flow and appears like an opaque fluid.

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“…[1][2][3][4] Furthermore, these polymers disAn investigation of random copoly(di-n-alkylsiplay both a low-temperature as well as a highloxane/di-n-hexylsiloxane)s has shown that structemperature crystalline modification. In the lowtural irregularities have a profound influence on temperature crystal the siloxane chains are rigidly the stability of the mesophase.…”

Section: Introductionmentioning

confidence: 98%

Poly[(S)-(+)-2-methylbutyl]pentylsiloxane

Molenberg

Michalke

Möller

et al. 1998

J. Polym. Sci. A Polym. Chem.

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Poly[(S)‐(+)‐2‐methylbutyl]pentylsiloxane has been synthesized by anionic ring opening polymerization of the corresponding strained cyclic trisiloxane \documentclass{article}\pagestyle{empty}\begin{document}$ (D^{\rm{MeBu, Pe}}_{3}) $\end{document} with cryptated lithium (Li+/[211]) as counterion. The polymer did not show the low and high temperature crystalline phases, that are generally found for poly(di‐n‐alkylsiloxane)s. Instead, the material formed a hexagonal columnar mesophase until it melted around 400°C. MAS and solution 13C‐ and 29Si‐NMR, polarizing microscopy and WAXS indicated an unexpectedly regular chain structure. It was tentatively concluded that the steric interaction of the (S)‐(+)‐2‐methylbutyl side chains introduces sufficient regularity of the tacticity and that the chains tend to adopt a defect helix conformation. On the other hand, DSC showed the presence of a glass transition at −113°C, indicating a high flexibility of the backbone. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 169–177, 1998

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Thermotropic Mesophases in Element-Organic Polymers

Cited by 95 publications

References 70 publications

Structural Characterization of Self-Organized Mono- and Multilayers of Partly Fluorinated Polydialkoxyphosphazenes at the Air/Water Interface

Structural Characterization of Self-Organized Mono- and Multilayers of Partly Fluorinated Polydialkoxyphosphazenes at the Air/Water Interface

Side Chain Liquid Crystalline Polymers: Advances and Applications

Poly[(S)-(+)-2-methylbutyl]pentylsiloxane

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