Book chapter
Chapter 7 Recent advances in thermal analysis of thermotropic mainchain liquid crystalline polymers
Handbook of Thermal Analysis and Calorimetry
2002
Abstract
This chapter discusses thermotropic liquid crystalline polymers phase structures, followed by three different research aspects related to their thermodynamic properties that can be measured by thermal characterization methods. The first aspect is an understanding of thermodynamic transition behaviors. Liquid crystalline transition parameters show little cooling and heating rate dependence that indicate that these transitions are close to equilibrium and is one of the major characteristics used in the identification of liquid crystalline phases. The chapter focuses on the enantiotropic and monotropic liquid crystalline behaviors. The enantiotropic phase possesses a stable liquid crystalline state in a temperature region between crystal melting and isotropization, while the monotropic phase is always metastable over the entire temperature region. Monotropic liquid crystalline transitions provide an opportunity to study kinetics of crystallization from the isotropic melt and the liquid crystalline state. The liquid crystalline transition and crystallization rates are close to each other, it is predicted that a possible competition between the formations of these two phases may exist. The chapter also discusses a quantitative method in investigating the contributions to the liquid crystalline orders from both mesogenic groups and aliphatic spacers that leads to a further understanding of the molecular origins of the liquid crystalline phase stability.
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Details
- Title
- Chapter 7 Recent advances in thermal analysis of thermotropic mainchain liquid crystalline polymers
- Creators
- Christopher Y. Li - Drexel University
- Publication Details
- Handbook of Thermal Analysis and Calorimetry
- Publisher
- Elsevier
- Resource Type
- Book chapter
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Scopus ID
- 2-s2.0-67649370947
- Other Identifier
- 991019196706704721