Reactivity-controlled synthesis of A2 + B3 type soluble hyperbranched polymers from aromatic diamines and cyanuryl chloride via a coupled monomer method. (September 2020)

• Record Type: Journal Article
• Authors: Shibasaki, Yuji; Sasahara, Rina; Hoshino, Yui; Tsukamoto, Tadashi; Suzuki, Eiichi; Oishi, Yoshiyuki
• Is Part Of: Materials today communications. Volume 24(2020)
• Publication Date: 2020-09
• Subjects: Triazine -- Hyperbranched polymer -- Polymer blend; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2020.101043
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Highlights: A soluble hb -polymer DM synthesis using CyC with aromatic diamines is demonstrated. A two-step process with careful addition of CyC affords the corresponding hb -polymer. A high T g (325 °C) film is successfully formulated from the hb -polymer. Abstract: High molecular weight hyperbranched poly(guanamine)s ( hb -PGs) based on cyanuric chloride (CyC) with various aromatic diamine monomers were successfully prepared via a coupled monomer (CM) method. The reaction of a diamine (A2 type monomer) with CyC (B3 type monomer) solution at −20 °C resulted in the corresponding (AB2 ) x type soluble intermediate, whose reaction then proceeded with an additional diamine monomer resulting in two- or three-component hb -PG polymers. A thick film was successfully prepared from a hb -Poly(BisAAF-CyC- m PDA) polymer solution that exhibits the exceptionally high T g of 325 °C (as determined by thermomechanical analysis (TMA)) compared with that of the linear-type PG ( l -PG) polymer such as poly(anilinodichloro- s -triazine-BisAAF) ( T g =191 °C). This hb -PG is miscible with the l -PG to a desired extent. Thus, blended polymer films were prepared, and their T g values were measured by TMA. The blended films with hb -PG weight fractions of 85 %, 90 %, and 95 % exhibit the T g s of 201, 212, and 228 °C, respectively. Contrary to the homo l -PGs, the blended films still exhibit stiffness above T g at temperatures up to 400 °C. This may suggest that the prepared hb -PG could play an effective roll in binding linear PG polymers to afford supramolecular networks with amino functions at the periphery.