Soluble polyimides containing 1, 4:3, 6‐dianhydro‐d‐glucidol and fluorinated units: Preparation, characterization, optical, and dielectric properties. Issue 19 (29th June 2017)

• Record Type: Journal Article
• Authors: Mi, Zhiming; Liu, Zhixiao; Tian, Chengshuo; Zhao, Xiaogang; Zhou, Hongwei; Wang, Daming; Chen, Chunhai
• Is Part Of: Journal of polymer science. Volume 55:Issue 19(2017)
• Page Start: 3253
• Page End: 3265
• Publication Date: 2017-06-29
• Subjects: 1, 4:3, 6‐dianhydro‐d‐glucidol -- polyimides -- solvent‐free melt heating method -- structure–property relationships -- trifluoromethyl; 547
• DOI: 10.1002/pola.28700
• Languages: English
• ISSNs: 0887-624X

Abstract

ABSTRACT: Aiming to develop soluble and colorless polyimides, two novel diamines, 2, 5‐bis(2‐trifluoromethyl‐4‐amino‐phenoxy)‐1, 4:3, 6‐dianhydrosorbitol (2a) and 2, 5‐bis(2‐methyl‐4‐amino‐phenoxy)‐1, 4:3, 6‐dianhydrosorbitol (2b), were designed and synthesized by the reduction of corresponding dinitro monomer which was obtained via solvent‐free melt heating method. Polyimides (PI–(1–5)) containing 1, 4:3, 6‐dianhydro‐d ‐glucidol fragments were prepared from 2a and five kinds of common dianhydrides and PI–6 was synthesized from 2b and 4, 4′‐(hexafluoroisopropylidene)‐diphthalic anhydride (6FDA) via a two‐step thermal imidization. All the polyimides were readily soluble in common polar solvents and could afford flexible, tough, and transparent films with transparency as high as 87% at 450 nm. Meanwhile, PI–(1–6) exhibited unexpectedly low dielectric constants of 2.02–2.52 at 1 MHz. In addition, analogs PI–7 derived from 2, 5‐bis(4‐amino‐phenoxy)‐1, 4:3, 6‐dianhydrosorbitol (2c) and 6FDA and PI–8 derived from 4, 4′‐bis(4‐amino‐2‐trifluoromethylphenoxy)biphenyl (2d) and 6FDA were also obtained via a two‐step thermal imidization for comparision with PI–(1–6) on aspects of thermal, mechnical, optical, electrical, and morphological properties. The structure–property relationships of PI–(1–8) were discussed in detail. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem.2017, 55, 3253–3265 Abstract : Isosorbide‐derived diamine is facilely synthesized by the reduction of corresponding dinitro monomer which is obtained via solvent‐free melt heating method. Rarely reported fluorinated polyimides containing isosorbide units is obtained by the polycondensation of diamine and commercial dianhydrides. These polyimides not only possess good thermal stability and mechanical properties, but also exhibit characteristics such as high transparency, organic soluble, and low dielectric constant, which are ideal candidates for optoelectronic devices.