SYNTHESIS OF CROSS-CONJUGATED（p-PHENYLENE）S-POLY（p-PHENYLENEVINYLENE）S HYBRIDS WITH LOW CONTENT OF STRUCTURAL DEFECTS

Shi-jun Zheng; Qun Xu and Shao-kui Cao College of the Material Science and Engineering; Zhengzhou University; Zhengzhou 450052; China

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SYNTHESIS OF CROSS-CONJUGATED（p-PHENYLENE）S-POLY（p-PHENYLENEVINYLENE）S HYBRIDS WITH LOW CONTENT OF STRUCTURAL DEFECTS

Note | Updated：2021-06-21

- SYNTHESIS OF CROSS-CONJUGATED（p-PHENYLENE）S-POLY（p-PHENYLENEVINYLENE）S HYBRIDS WITH LOW CONTENT OF STRUCTURAL DEFECTS
- SYNTHESIS OF CROSS-CONJUGATED（p-PHENYLENE）S-POLY（p-PHENYLENEVINYLENE）S HYBRIDS WITH LOW CONTENT OF STRUCTURAL DEFECTS
- 高分子科学（英文版） 2007年第2期页码：171-179
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  This work was supported by the National Natural Science Foundation of China （No. 20574064）.()
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Shi-jun Zheng, Qun Xu and Shao-kui Cao College of the Material Science and Engineering, Zhengzhou University, 等. SYNTHESIS OF CROSS-CONJUGATED（p-PHENYLENE）S-POLY（p-PHENYLENEVINYLENE）S HYBRIDS WITH LOW CONTENT OF STRUCTURAL DEFECTS[J]. 高分子科学（英文版）, 2007,(2):171-179.

Shi-jun Zheng, Qun Xu and Shao-kui Cao College of the Material Science and Engineering, Zhengzhou University, et al. SYNTHESIS OF CROSS-CONJUGATED（p-PHENYLENE）S-POLY（p-PHENYLENEVINYLENE）S HYBRIDS WITH LOW CONTENT OF STRUCTURAL DEFECTS[J]. 2007,(2):171-179.
Shi-jun Zheng, Qun Xu and Shao-kui Cao College of the Material Science and Engineering, Zhengzhou University, 等. SYNTHESIS OF CROSS-CONJUGATED（p-PHENYLENE）S-POLY（p-PHENYLENEVINYLENE）S HYBRIDS WITH LOW CONTENT OF STRUCTURAL DEFECTS[J]. 高分子科学（英文版）, 2007,(2):171-179. DOI：

Shi-jun Zheng, Qun Xu and Shao-kui Cao College of the Material Science and Engineering, Zhengzhou University, et al. SYNTHESIS OF CROSS-CONJUGATED（p-PHENYLENE）S-POLY（p-PHENYLENEVINYLENE）S HYBRIDS WITH LOW CONTENT OF STRUCTURAL DEFECTS[J]. 2007,(2):171-179. DOI：

摘要

<正>The novel shish-kebab-type liquid crystalline cross-conjugated （p-phenylene）s-poly（p-phenylenevinylene）s hybrid was synthesized through Gilch polymerization. Their structures and properties were characterized by NMR, GPC, DSC, X-ray diffraction and polarizing optical microscope （POM）. ’H-NMR investigation of the polymers indicates that the shish-kebab-structure has a strong ability to suppress the structural defects in the polymers. The polymers are enantiotropic liquid crystals. The melting point （Tm） of the polymers decreases when the length of the alkoxy tails of the mesogenic units increases. The mesophase was identified by X-ray diffraction method. They showed not only a smectic LC phase, but also a strong green fluorescence in chloroform. The maximum absorption band of the "kebabs" of the two, 5-bis（4’-alkoxyphenyl）benzene at 280 nm did not appear in absorption spectra of the polymers. The same phenomena were also observed in the fluorescence spectra. These results imply that the polymers have formed a cross-conjugated uniform structure and achieved an extendedπ-conjugation polymer.

Abstract

The novel shish-kebab-type liquid crystalline cross-conjugated （p-phenylene）s-poly（p-phenylenevinylene）s hybrid was synthesized through Gilch polymerization. Their structures and properties were characterized by NMR, GPC, DSC, X-ray diffraction and polarizing optical microscope （POM）. ’H-NMR investigation of the polymers indicates that the shish-kebab-structure has a strong ability to suppress the structural defects in the polymers. The polymers are enantiotropic liquid crystals. The melting point （Tm） of the polymers decreases when the length of the alkoxy tails of the mesogenic units increases. The mesophase was identified by X-ray diffraction method. They showed not only a smectic LC phase, but also a strong green fluorescence in chloroform. The maximum absorption band of the "kebabs" of the two, 5-bis（4’-alkoxyphenyl）benzene at 280 nm did not appear in absorption spectra of the polymers. The same phenomena were also observed in the fluorescence spectra. These results imply that the polymers have formed a cross-conjugated uniform structure and achieved an extendedπ-conjugation polymer.

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