Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties

Citation: Hui-jing Han, Sha Zhang, Ru-yi Sun, Jian-hua Wu, Mei-ran Xie, Xiao-juan Liao. Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties[J]. Chinese Journal of Polymer Science, 2016, 34(3): 378-389. doi: 10.1007/s10118-016-1753-0 shu

Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties

1.
School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
基金项目:
This work was financially supported by the National Natural Science Foundation of China (Nos. 21574041 and 21374030), and Large Instruments Open Foundation of East China Normal University (No. 20151006).

摘要: Block copolymers poly(endo-N-3,5-bis(trifluoromethyl)biphenyl-norbornene-pyrrolidine)-block-poly(exo-N-(cinnamoyloxyethyl)-7-oxanorborn-5-ene-2,3-dicarboximide) (endo-PTNP-b-exo-PCONBI) and poly(exo-N-3,5-bis(trifluoromethyl)biphenyl-norbornene-pyrrolidine)-block-poly(exo-N-(cinnamoyloxyethyl)-7-oxanorborn-5-ene-2,3-dicarboximide) (exo-PTNP-b-exo-PCONBI) were synthesized by ring-opening metathesis polymerization. The endo- or exo-PTNP served as the high dielectric functional chain, and exo-PCONBI acted as the crosslinking segment. The endo-PTNP-b-exo-PCONBI, in which endo-PTNP has a high content of trans double bond and adopts isotactic configuration, shows a dielectric constant () of 15.5, whereas exo-PTNP-b-exo-PCONBI, in which exo-PTNP has 67% trans double bonds and atactic microstructure, displays relatively low of 7.1. The cinnamate groups in exo-PCONBI were crosslinked to form three-dimensional network by cycloaddition reaction under UV irradiation. Exposed to UV-light for 10 min, the cinnamate group in polymer films has a crosslinking conversion of 36%, as determined by UV-Vis absorption measurements. By photo-crosslinking, the polymer film has an increased of 16.6, a dielectric loss of 0.03, an elevated glass-transition temperature of 137 ℃, and an enhanced decomposition temperature of 405 ℃, compared to those of polymer films without irradiation.

关键词:

English

Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties

1.
School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
Received Date: 27 September 2015
Revised Date: 08 November 2015
Available Online: 05 March 2016
Fund Project:
This work was financially supported by the National Natural Science Foundation of China (Nos. 21574041 and 21374030), and Large Instruments Open Foundation of East China Normal University (No. 20151006).

Abstract: Block copolymers poly(endo-N-3,5-bis(trifluoromethyl)biphenyl-norbornene-pyrrolidine)-block-poly(exo-N-(cinnamoyloxyethyl)-7-oxanorborn-5-ene-2,3-dicarboximide) (endo-PTNP-b-exo-PCONBI) and poly(exo-N-3,5-bis(trifluoromethyl)biphenyl-norbornene-pyrrolidine)-block-poly(exo-N-(cinnamoyloxyethyl)-7-oxanorborn-5-ene-2,3-dicarboximide) (exo-PTNP-b-exo-PCONBI) were synthesized by ring-opening metathesis polymerization. The endo- or exo-PTNP served as the high dielectric functional chain, and exo-PCONBI acted as the crosslinking segment. The endo-PTNP-b-exo-PCONBI, in which endo-PTNP has a high content of trans double bond and adopts isotactic configuration, shows a dielectric constant () of 15.5, whereas exo-PTNP-b-exo-PCONBI, in which exo-PTNP has 67% trans double bonds and atactic microstructure, displays relatively low of 7.1. The cinnamate groups in exo-PCONBI were crosslinked to form three-dimensional network by cycloaddition reaction under UV irradiation. Exposed to UV-light for 10 min, the cinnamate group in polymer films has a crosslinking conversion of 36%, as determined by UV-Vis absorption measurements. By photo-crosslinking, the polymer film has an increased of 16.6, a dielectric loss of 0.03, an elevated glass-transition temperature of 137 ℃, and an enhanced decomposition temperature of 405 ℃, compared to those of polymer films without irradiation.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties

English

Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties

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Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties

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Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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