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High Glass Transition of Fluorinated Polyimides Derived from 4‐(3,4‐Difluorophenyl)‐2,6‐bis(4‐aminophenyl)pyridine
Author(s) -
Xu Xu,
Chen Beicai,
Li Hua,
Huang Xiaohua,
Wei Chun
Publication year - 2017
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201600615
Subject(s) - glass transition , chemistry , pyridine , polymer , amorphous solid , polymer chemistry , thermal decomposition , ultimate tensile strength , monomer , thermogravimetric analysis , contact angle , atmospheric temperature range , composite material , crystallography , organic chemistry , materials science , physics , meteorology
A series of novel fluorinated polyimides ( PIs ) were prepared from 4‐(3,4‐difluorophenyl)‐2,6‐bis(4‐aminophenyl)pyridine ( FPAP ) and commercial aromatic dianhydrides via conventional two‐step thermal imidization technique. The structure of the monomer was confirmed by FT‐IR , NMR , and mass spectrometry. All of the obtained PIs were studied with FT‐IR , TGA , DSC , WAXD and contact angles analysis. These results showed that polymer materials presented excellent thermal properties with the glass transition temperature ( T g ) in the range of 336—434 °C, as well as T 5% , and T 10% decomposition temperature ranges of 543—600 °C and 562—622 °C in a nitrogen atmosphere, respectively. Moreover, they presented excellent mechanical properties with tensile strengths of 68—91 MPa , elongation at break of 5.6%—10.2%, and young's modulus of 1.8—2.4 GPa . Furthermore, they showed outstanding hydrophobicity with the contact angle in the range of 90.5°—96.6°, and the results of WAXD indicated all of the polymers presented amorphous structure.