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

Hui-jing Han; Sha Zhang; Ru-yi Sun; Jian-hua Wu; Mei-ran Xie; Xiao-juan Liao

doi:10.1007/s10118-016-1753-0

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

Updated：2021-06-21

- Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties
- Chinese Journal of Polymer Science Vol. 34, Issue 3, Pages: 378-389(2016)
- Affiliations：
  
  School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
- Author bio：
  
  **Mei-ran Xie (谢美然), E-mail: mrxie@chem.ecnu.edu.cn
  Xiao-juan Liao (廖小娟), E-mail: xjliao@chem.ecnu.edu.cn
- Funds：
- DOI：10.1007/s10118-016-1753-0
  CLC：
- Received：27 September 2015，
  
  Revised：2015-11-08，
  
  Accepted：11 November 2015，
  
  Published：2016-03
- Accepted：
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Hui-jing Han, Sha Zhang, Ru-yi Sun, et al. Photocrosslinkable Polynorbornene-based Block Copolymers with Enhanced Dielectric and Thermal Properties[J]. Chinese Journal of Polymer Science, 2016, 34(3): 378-389.
DOI：

Hui-jing Han, Sha Zhang, Ru-yi Sun, et al. 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.

摘要

Abstract

Block copolymers poly(

endo

-3

5-bis(trifluoromethyl)biphenyl-norbornene-pyrrolidine)-block-poly(

exo

-(cinnamoyloxyethyl)-7-oxanorborn-5-ene-2

3-dicarboximide) (

endo

PTNP

exo

PCONBI

) and poly(

exo

-3

5-bis(trifluoromethyl)biphenyl-norbornene-pyrrolidine)-block-poly(

exo

-(cinnamoyloxyethyl)-7-oxanorborn-5-ene-2

3-dicarboximide) (

exo

PTNP

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

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

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 °C

and an enhanced decomposition temperature of 405 °C

compared to those of polymer films without irradiation.

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