Structural aspects in polymers: interconnections between conformational parameters of the polymers with their physical properties

Abstract

This article focuses on the influence of the geometric structure of the polymer chain on the physical properties of polymers. It is shown that for polyheteroarylenes the Kuhn segment calculated based on the geometric structure of the polymer chain has a good correlation with the physical properties of those polymers. For aliphatic polymers, a volume factor is suggested that equals the ratio of the Van der Waals volume of pendant substitute to the volume of the whole polymer chain. It is shown that the properties of aliphatic polymers that depend on free volume are well described by this value.

Influence of conformational rigidity on membrane properties of polyimides

“…Another parameter which was used in this study to correlate the geometry of the repeating unit with transport parameters was the statistical Kuhn segment A fr [12] which was calculated using Eq. 2…”

Influence of chemical structure on glass transition temperature of polyimides

“…The first group contains polymers 1-5 based on hexafluoroisopropylidene-bis(aniline) (polymers 1, 2, 4, 5) or isopropylidene-bis(aniline) (polymer 3); the second group contains polyimides 6-10 based on the diamine having cyano-substituted meta-phenylene ring, namely 2,5-bis(aminophenoxy)-benzonitril; the third group contains polyimides 11-16 based on bis(aminophenoxyphenyl)-isopropane (polymers 11, 13) or bis(aminophenoxyphenyl)-hexafluoroisopropane (polymers 12,14,15,16); the fourth group contains polymers 17-20 based on bis(4-aminophenyl)-oxadiazole, and the fifth group contains polymers 21-26 based on bis(aminophenoxy-phenyl)-oxadiazole. Now, we examine how the glass transition temperature is influenced by the connecting bridge between two imide rings in polyimides based on one diamine monomer (or two very similar diamines).…”

“…The first group of polymers (1)(2)(3)(4)(5): polyimides based on isopropylidene-bis(aniline) or hexafluoroisopropylidene-bis(aniline) [20] The third group of polymers (11)(12)(13)(14)(15)(16): polyimides based on bis(aminophenoxy-phenyl)-isopropane or bis(aminophenoxy-phenyl)-hexafluoroisopropane [20] Struct Chem (2010) 21:1013-1020 1015 not find any data regarding its synthesis and glass transition temperature. The dependence of glass transition temperature on conformational rigidity for the other three polymers in this group is linear with a high correlation coefficient (R = 95.57%).…”

“…An exception is made by the point belonging to polymer 1: this is out of that dependence. The rigid connection between two imide rings, and (11)(12)(13)(14)(15)(16) the structure of the diamine component determine a high conformational rigidity (A fr = 37 Å ) of this polymer and, consequently, a high glass transition temperature. In the last three groups of polymers containing various bridges between imide rings, such as carbonyl, hexafluoroisopropylidene or tetramethylsiloxane, which increase the flexibility of polymers, the change of diamine component has a significant influence (Table 3; Figs.…”

Interplay of thermochemistry and Structural Chemistry, the journal (volume 21, 2010) and the discipline

“…In the paper by Ronova [146], a volume factor that serves as a good proxy for the geometric structure of a unit of aliphatic polymers has been suggested. This factor correlates with those physical properties that depend on the free volume.…”