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We synthesized the liquid crystal dimer and trimer members of a series offlexible linear oligomers and characterized their microscopic and nanoscopicproperties using resonant soft x-ray scattering and a number of otherexperimental techniques. On the microscopic scale, the twist-bend phases of thedimer and trimer appear essentially identical. However, while the liquidcrystal dimer exhibits a temperature-dependent variation of its twist-bendhelical pitch varying from 100 - 170 {\AA} on heating, the trimer exhibits anessentially temperature-independent pitch of 66 {\AA}, significantly shorterthan those reported for other twist-bend forming materials in the literature.We attribute this to a specific combination of intrinsic conformational bend ofthe trimer molecules and a sterically favorable intercalation of the trimersover a commensurate fraction (two-thirds) of the molecular length. We develop ageometric model of the twist-bend phase for these materials with the moleculesarranging into helical chain structures, and we fully determine theirrespective geometric parameters.

Distinct differences in the nanoscale behaviors of the twist-bend liquid crystal phase of a flexible linear trimer and homologous dimer