Hyperbranched Thermosetting Poly(imide−ester):  Synthesis and Properties

Abstract

A new family of polymer, namely hyperbranched thermosetting poly(imide−ester) (HBPIE), was successfully prepared by the esterification reaction between a hyperbranched oligoimide terminated with carboxylic end groups (−COOH) and a hyperbranched oligoester terminated with acetoxy end groups (−OAc). The hyperbranched oligoimide has a degree of branching of one, M w = 14 180, and polydispersity Pd = 1.953. The −OAc-terminated oligoester has M w = 7000 and polydispersity Pd = 1.17. The NMP solution of the oligoimide and oligoester had excellent film-forming properties. HBPIE films cured from these two oligomers are thermally stable and display surface area of 83 m2/g due to their intrinsic microporosity (pore size 12.7 Å). The submicrometer thin film of HBPIE also displays an intermediate dielectric constant and high dielectric breakdown strength.

Secondary and primary relaxations in hyperbranched polyglycerol: A comparative study in the frequency and time domains

“…The model, which assumes that dendritic macromolecules are very rigid with not backfolding of the molecular arms, is supported by the molecular modeling experiments of Naylor et al 7 However, if inward folding is allowed, the kinetic model of Lescanec and Muthukumar 8 predicts that the chain ends are buried at all regions of dendritic macromolecules. Other studies dealing with the dielectric properties of hyperbranched thermosetting poly͑imide-ester͒ 20 and hyperbaranched aromatic polyamide and polyamide-6,6 blends 21 have also been reported. Monte Carlo simulations based on equilibrium structures carried out by Mansfield and Klushin 9 support the structures predicted by the Lescanes and Muthukumar model.…”

Broadband Dielectric Spectroscopy Studies of Hyperbranched Polyglycerols

“…However, compression significantly reduces the broad distribution of relaxation times which is an indication that pressure induces dynamic homogeneity in this dendritic material. Xu and Economy [12] reported the synthesis and dielectric properties of thin films of hyperbranched thermosetting poly(imide-ester). Hakme et al [13] recently reported dielectric spectroscopy of hyperbranched aromatic polyamide and polyamide-6,6 blends, where the authors found three relaxations: two secondary relaxations, and one primary a relaxation in the hyperbranched polymers as well as in the blends.…”

Synthesis and characterization of a novel nonlinear optical hyperbranched polymer containing a highly performing chromophore

“…Compounds 1 , CPO1 , DMTMM , and Xu‐COOH were prepared according to the methods described in the literature. Chemicals were purchased from Acros France supplier or Aldrich France supplier and used as received.…”

“…Toward this goal, we selected the CPO1 chromophore because it displays a very high quadratic hyperpolarizability coefficient ( μβ = 31,000 ⋅ 10 −48 esu at 1990 nm) and can be readily synthesized in multigram scale (Fig. ) . This push–pull type chromophore (D‐π‐A) is composed of an indoline donor group (D) coupled to a TCF (2‐dicyanomethylidene‐3‐cyano‐4,5,5‐trimethyl‐2,5‐dihydrofuran) (A) through a ring‐locking polyene (π).…”