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Optically Transparent and Thermal‐Stable Polyimide Films Derived from a Semi‐Aliphatic Diamine: Synthesis and Properties
Author(s) -
Wu Xiuming,
Shu Chen,
He Xiaoqian,
Wang Shoubai,
Fan Xiang,
Yu Zhenhai,
Yan Deyue,
Huang Wei
Publication year - 2020
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201900506
Subject(s) - diamine , polyimide , glass transition , materials science , differential scanning calorimetry , polymer chemistry , solubility , ultimate tensile strength , polymer , thermal stability , polymerization , aniline , chemical engineering , composite material , chemistry , organic chemistry , layer (electronics) , physics , engineering , thermodynamics
A novel semi‐aliphatic diamine with bulky cyclohexyl and ortho ‐substituted tertiary butyl groups (4,4'‐(cyclohexylmethylene)bis(2‐( tert ‐butyl)aniline), CHMBTBA) is synthesized via Mannich and rearrangement reactions of cyclohexanecarboxaldehyde and 2‐ tert ‐butylaniline. Afterward, several semi‐aliphatic polyimides are prepared by the high‐temperature one‐pot polymerization of CHMBTBA with various aromatic dianhydrides respectively. The resulting PIs exhibit outstanding solubility in common organic solvents (i.e., trichloromethane, etc.) and are easily processed into light color or colorless transparent films (thickness: 25 ± 1 µm) by the blade coating of polymer solution. The transmittance of all resulting films is above 86% in the visible light region (400–760 nm). Their glass transition temperatures exceed 310 °C and reach even to 374 °C (by differential scanning calorimetry). They also display low water absorption (0.29–0.87%) and good mechanical properties (tensile strength: 50.9–87.7 MPa, Young's modulus: 2.0‐2.5 GPa, elongation at break: 3.8–7.6%). Thus, they are promising potential candidates for flexible display substrates.