Geopolymers
Inorganic polymeric new materials
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Ting Hu
Ting Hu
Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Huanling Kong
Huanling Kong
Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Lie Chen
Lie Chen
Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Yiwang Chen
Yiwang Chen
Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Fan Li
Fan Li
Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Daijun Zha
Daijun Zha
Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Abstract
Novel ferroelectric liquid crystalline (FLC) polyacetylenes, namely, “side-end-fixed” type of PAM6OTPhOR∗ and “side-on-fixed” type of PAM3OCO(TPh)OR∗ were designed and synthesized in high yields (89.3 and 62.0%), respectively, where the terphenyl was linked at the different positions. The thermal stability of PAM3OCO(TPh)OR∗ is better than PAM6OTPhOR∗ owing to the “jacket effect” from terphenyl pendant linked at the waist position well protecting the main chain from the perturbations. The PAM3OCO(TPh)OR∗ shows enantiotropic chiral smectic A phase (SmA∗), but it is noteworthy that the PAM6OTPhOR∗ exhibits enantiotropic chiral smectic C phase (SmC∗) responsible for ferroelectric liquid crystallinity. Compared to “side-end-fixed” type of polymer, the “side-on-fixed” type shows better light emitting property, ascribed to the mesogen linked at the waist position has stronger tendency to enhance the main-chain coplanarity. Furthermore, the circular dichroism (CD) spectra demonstrate that the asymmetric force field generated by the chiral center affects the secondary structure of PAM3OCO(TPh)OR∗.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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