Methyl Groups Pendant on Triphenylmethane Toward Modulating Thermal Stability and Dielectric Properties of the Crosslinkable Fluorinated Polyimide Films with High Transparency

Wen Yang; Liang Yuan; Kai Gong; Ruo-Han Zhang; Lan Lei; Hui Li

doi:10.1007/s10118-024-3243-0

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Methyl Groups Pendant on Triphenylmethane Toward Modulating Thermal Stability and Dielectric Properties of the Crosslinkable Fluorinated Polyimide Films with High Transparency

RESEARCH ARTICLE | Updated：2025-01-23

- Methyl Groups Pendant on Triphenylmethane Toward Modulating Thermal Stability and Dielectric Properties of the Crosslinkable Fluorinated Polyimide Films with High Transparency
- Chinese Journal of Polymer Science Vol. 43, Issue 2, Pages: 316-327(2025)
- Affiliations：
  
  a.School of Chemistry and Chemical Engineering, Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering Materials, University of Jinan, Jinan 250022, China
  b.School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China
- Author bio：
  
  chm_leil@ujn.edu.cn (L.L.)
  chm_lih1@ujn.edu.cn (H.L.)
- Funds：
- DOI：10.1007/s10118-024-3243-0
  CLC：
- Published：01 February 2025，
  
  Published Online：25 November 2024，
  
  Received：04 September 2024，
  
  Revised：22 September 2024，
  
  Accepted：2024-09-30
- Accepted：
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WEN YANG, LIANG YUAN, KAI GONG, et al. Methyl Groups Pendant on Triphenylmethane Toward Modulating Thermal Stability and Dielectric Properties of the Crosslinkable Fluorinated Polyimide Films with High Transparency. [J]. Chinese journal of polymer science, 2025, 43(2): 316-327.
DOI：

WEN YANG, LIANG YUAN, KAI GONG, et al. Methyl Groups Pendant on Triphenylmethane Toward Modulating Thermal Stability and Dielectric Properties of the Crosslinkable Fluorinated Polyimide Films with High Transparency. [J]. Chinese journal of polymer science, 2025, 43(2): 316-327. DOI： 10.1007/s10118-024-3243-0.

摘要

A series of crosslinkable fluorinated polyimide films containing different numbers of methyl groups were synthesized. By regulating the methyl and crosslinking structures

the films exhibited high transparency

excellent thermal stability

and dielectric properties. Molecular dynamics simulations and density functional theory were used to investigate the influence mechanism of methyl groups on the properties of the films.

Abstract

It is urgent to develop high-performance polyimide (PI) films that simultaneously exhibit high transparency

exceptional thermal stability

mechanical robustness

and low dielectric to fulfil the requirements of flexible display technologies. Herein

a series of fluorinated polyimide films (FPIs) were fabricated by the condensation of 5

5′-(perfluoropropane-2

2-diyl) bis(isobenzofuran-1

3-dione) (6FDA) and the fluorinated triphenylmethane diamine monomer (EDA

MEDA and DMEDA) with heat-crosslinkable tetrafluorostyrene side groups

which was incorporated by different numbers of methyl groups pendant in the ortho position of amino groups. Subsequently

the FPI films underwent heating to produce crosslinking FPIs (C-FPIs) through the self-crosslinking of double bonds in the tetrafluorostyrene. The transparency

solvent resistance

thermal stability

mechanical robustness and dielectric properties of FPI and C-FPI films can be tuned by the number of methyl groups and crosslinking

which were deeply investigated by virtue of molecular dynamics (MD) simulations and density functional theory (DFT). As a result

all the films exhibited exceptional optically colorless and transparent

with transmittance in the visible region of 450−700 nm exceeding 79.9%

and the cut-off wavelengths (

off

) were nearly 350 nm. The thermal decomposition temperatures at 5% weight loss (

d5%

) for all samples exceeded 504 °C. These films exhibited a wide range of tunable tensile strength (46.5–75.1 MPa). Significantly

they showed exceptional dielectric properties with the dielectric constant of 2.3–2.5 at full frequency (10

–20 Hz). This study not only highlights

the relationship between the polymer molecular structure and properties

but offer insights for balancing optical transparency

heat resistance and low dielectric constant in PI films.

关键词

Keywords

Crosslinkable fluorinated polyimideMethyl groupTriphenylmethaneTransparencyThermal stabilityLow dielectric constant

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