Journal ArticleDOI
Synthesis and characterization of negative‐type photosensitive hyperbranched polyimides with excellent organosolubility from an A2 + B3 monomer system
Huan Chen,Huan Chen,Jie Yin +2 more
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In this paper, a series of photosensitive hyperbranched polyimides (HB-PIs) were prepared through facile end-group modifications of the fully imidized polymer.Abstract:
A series of photosensitive hyperbranched polyimides (HB-PIs) were prepared through facile end-group modifications of the fully imidized polymer. A triamine, 1,3,5-tris(4-aminophenoxy)benzene, and a dianhydride, 4,4′-(hexafluoroisopropylidene)diphthalic anhydride, were condensed with a dropwise addition method in a molar ratio of 1/2 to afford an anhydride-terminated poly(amic acid) precursor, which was then end-capped by 4-aminophenol and chemically imidized to yield a phenol-terminated HB-PI. The modifications of the terminal phenol groups of the polyimide by acyl chloride compounds (acryloyl chloride, methylacryloyl chloride, and cinnamoyl chloride) gave the target polymers. The photosensitive HB-PIs showed good thermal properties and excellent solubility even in low-boiling-point solvents at room temperature, such as acetone, 1,1,2-trichloroethane, tetrahydrofuran, and chloroform. Photosensitive property studies revealed good photolithographic properties with a resolution greater than 3 μm and a sensitivity of 650–680 mJ/cm2. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 1735–1744, 2004read more
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Hyperbranched polymers from A2 + B3 strategy: recent advances in description and control of fine topology
Heng Chen,Jie Kong +1 more
TL;DR: In this paper, a review of recent advances in the description and control of fine topological structures of hyperbranched polymers is presented. But the focus of the review is on the control strategies for the topological structure with a focus on avoiding gelation and tailoring the degree of branching.
Journal ArticleDOI
Synthesis and gas permeation properties of hyperbranched polyimides membranes from a novel (A2+B2B′+B2)-type method
TL;DR: In this paper, a series of hyperbranched polyimides were successfully synthesized by A 2 +B 2 B′+B 2 copolymerization from 2,2-bis(3,4-dicarboxylphenyl) hexafluoropropane dianhydride (6FDA), 2,4,6-triaminopyrimidine (TAP) and 4,4′-oxydianiline (ODA).
Journal ArticleDOI
Polycondensation of ‘a − bn’ or ‘a2 + + bn’ Monomers - A Comparison
TL;DR: In this paper, the properties of polycondensation and condensative chain polymerization are discussed along with a differentiation between kinetically controlled and thermodynamically controlled polycondensations.
Journal ArticleDOI
Poly(ether imide)s derived from phthalazinone‐containing dianhydrides
TL;DR: An unsymmetrical and noncoplanar heterocyclic dianhydride was synthesized from a bisphenol-like phthalazinone, 4-(4-hydroxylphenyl)-2,3-phthalazin-1-one, and a series of novel poly(ether imide)s based on it, with intrinsic viscosities of 0.67-1.42 dL/g, were obtained by one-step solution polymerization in m-cresol at 200 °C for 20 h.
Journal ArticleDOI
Hyperbranched aromatic polyesters: From synthesis to applications
TL;DR: A review of the development in synthesis, modifications, and applications of aromatic hyperbranched polyesters can be found in this article, where the authors present a number of applications of polyesters.
References
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Book
Fundamentals and applications
John Weiner,Ping-Tong Ho +1 more
TL;DR: The Optical Bloch Equations of a Two-Level Atom as mentioned in this paper are derived from a two-level atom and are used for light-matter interaction in light-matters interaction.
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One-step synthesis of hyperbranched dendritic polyesters
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Hyperbranched polymers: a promising new class of materials
TL;DR: Hyperbranched polymers are highly branched macromolecules that are prepared through a one-step polymerization process as discussed by the authors, which are generally composed of dendritic, linear and terminal units and a degree of branching helps to describe their structures.
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Functional dendrimers, hyperbranched and star polymers
TL;DR: In this article, the synthesis, properties, and functionality of dendrimers, hyperbranched polymers, and star polymers with emphasis on functional aspects are reviewed.
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Discovery of dendrimers and dendritic polymers: A brief historical perspective*
TL;DR: A brief historical perspective relating the discovery of dendrimers and other dendritic polymers is presented in this paper, with anecdotal events leading to implications for dendrilers in the emerging science of nanotechnology.