Frustrated Behavior of a Side-Chain Liquid Crystalline Polyacrylate

Boiko, N. I.; Shibaev, Valéry; Ostrovskiǐ, B. I.; Sulyanov, S. N.; Wolff, Dietmar; Springer, Jürgen

doi:10.1002/1521-3935(20010101)202:2<297::aid-macp297>3.0.co;2-q

Cited by 17 publications

(20 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 of I) were synthesized and fractionated into highly monodisperse samples as described in [7]. 1 of I) were synthesized and fractionated into highly monodisperse samples as described in [7].…”

Section: Methodsmentioning

confidence: 99%

Untitled

et al. 2001

View full text Add to dashboard Cite

We report on the thin-film behaviour of a polyacrylate with phenyl benzoate mesogenic side groups and a narrow polydispersity. Depending on the degree of polymerisation, these polymers show a nematic, a smectic-A d , a re-entrant nematic and aC phase with a two-dimensional monoclinic lattice. X-ray reflectivity and atomic-force microscopy have been used to characterize the structure and surface morphology. The system exhibits two stable side-chain packing configurations with incommensurate spacings that can be both stabilized at a free surface. Thin films in the nematic phase show a structural dewetting induced by the growth of surface domains of theC phase. Additionally, surface-induced ripples with a nanoscale lateral period form at the air-film interface. We attribute these patterns to a coupling between the local liquid crystalline ordering of the mesogenic side groups and the surface curvature energy. PACS. 64.70.Md Transitions in liquid crystals -78.70.Ck X-ray scattering -61.30.Eb Experimental determinations of smectic, nematic, cholesteric, and other structures

show abstract

Section: Methodsmentioning

confidence: 99%

Untitled

et al. 2001

View full text Add to dashboard Cite

show abstract

“…The film surface shows regular height modulations with a periodicity of 9 nm, which are attributed to a coupling between local LC order and surface curvature energy. [9] The phase diagram poly(4-(5-acryloyloxypent-1-yloxyphenyl)-4¢-butoyloxybenzoate) (PABB-5) homopolymer [10] is shown in Figure 1. We prepared two types of film characterized by a degree of polymerization N = 37 (film I) and N = 55 (film II), respectively.…”

mentioning

confidence: 99%

Microscopic Surface Patterns of a Liquid Crystalline Polyacrylate Film

2001

View full text Add to dashboard Cite

Lamellae‐like surface ripples, as shown in the Figure, can be induced on liquid crystalline polyacrylate films. The film surface shows regular height modulations, which are attributed to coupling between local liquid crystal ordering and surface curvature energy. The properties of these films, including their use for the patterning of otherwise homogeneous surfaces, are discussed in this communication.

show abstract

“…With DSC no heat effects are detected at the N-Sm-A d and Sm-A d -RN transitions [8]. However, conclusive evidence can be obtained from the XD data depicted in Figure 4 for P w = 55.…”

Section: Resultsmentioning

confidence: 68%

“…1) were synthesized and fractionated into highly monodisperse samples as described in [8]. 1) were synthesized and fractionated into highly monodisperse samples as described in [8].…”

Section: Methodsmentioning

confidence: 99%

Untitled

et al. 2001

View full text Add to dashboard Cite

The phase behaviour and structure are reported of a new type of frustrated side-chain liquid crystalline (LC) polymer, a polyacrylate with phenylbenzoate mesogenic side groups and a narrow polydispersity. At a high degree of polymerisation the LC polymers show a nematic, a smectic-A d , a re-entrant nematic and aC phase, for shorter chains only a nematic and aC phase. This constitutes a new example of nematic re-entrance for which the driving field is the length of the polymer chain. The smectic-A d layers consist of partially overlapped side groups while in theC phase the side chains are rearranged into chevron-like blocks of bilayers. We propose an explanation of the frustrated phase behaviour in terms of these two different competing length scales and their coupling to the backbone conformations. PACS. 64.70.Md Transitions in liquid crystals -78.70.Ck X-ray scattering -61.30.Eb Experimental determinations of smectic, nematic, cholesteric, and other structures

show abstract

Frustrated Behavior of a Side-Chain Liquid Crystalline Polyacrylate

Cited by 17 publications

References 17 publications

Untitled

Untitled

Microscopic Surface Patterns of a Liquid Crystalline Polyacrylate Film

Untitled

Contact Info

Product

Resources

About