Synthesis and crosslinking study of isomeric poly(thioether ether imide)s containing pendant nitrile and terminal phthalonitrile groups

Abstract

Upon crosslinking, phthalonitrile-terminated polyimide PN-PI (a–d) films exhibited better solvent resistance, and greater thermal and mechanical properties than PI (a–d) films.

Polymerization mechanism of 4-APN and a new catalyst for phthalonitrile resin polymerization

“…Phthalonitrile (PN) resin, as a representative high-performance resin, has many excellent properties, such as excellent mechanical properties, heat resistance, moisture resistance, corrosion resistance, ablation resistance, and so on. [1][2][3][4][5] However, the early application of phthalonitrile was hindered by its extremely difficult polymerization and reaction inertness. [6][7][8] Subsequently, researchers found that different catalysts, including amines, phenols, carboxylic acids, and inorganic salts, could drastically reduce the curing temperature and reduce the curing time.…”

Synthesis and properties of fluorinated polyimides with multi-bulky pendant groups

“…Aromatic polyimides (PIs) are considered to be one of the most successful high performance polymers and have shown important application value in the elds of aerospace and microelectronics due to their excellent thermal, mechanical, and electrical properties. [1][2][3][4][5][6][7] However, most polyimides like other aromatic polymers are insoluble and infusible in the fully imidized form because of their high molecular rigidity and strong intermolecular interaction, thus leading to processing difficulties. Moreover, the commercial polyimide lms generally possess relatively high dielectric constant (3.5 at 1 MHz) and have strong absorption in the ultraviolet-visible region.…”

Synthesis of cardo containing asymmetric poly(ether-naphthalimide-phthalimide)s

“…However, the wide applications for PIs are often limited due to poor organosolubility and high melt viscosity, derived from the rigid backbones. Some structural modifications, such as the incorporation of asymmetric monomers and flexible ether linkages into the polyimide, resulted in better solubility and processability of the polyimides . Generally, it has been noticed that ether linkages lead to low glass transition temperature ( T g ) of polyetherimides (PEIs) due to reduced chain stiffness .…”

“…In general, bishalo(phthalimide) monomers containing terminal chloro and fluoro groups are common for aromatic nucleophilic substitution polymerization . However, bishalo(naphthalimide) monomers are scarcely known and are limited to bischloro(naphthalimide) due to the commercial availability of only the chloro derivative of naphthalic anhydride .…”