Polycyclotrimerization as a general route to polymers with rings in the chains

Korshak, V.V.

doi:10.1351/pac197439010065

Cited by 18 publications

(7 citation statements)

References 11 publications

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“…Considering the A 2 + B y , many resins actually fit the term “hyperbranched” in the form of a soluble precursor polymer ready for curing. Thus, an early example for hyperbranched structures was introduced by Korshak, who described the synthesis of branched polyphenylenes through cyclotrimerization of various diethynylbenzenes with phenylacetylenes . These acetylene-terminated phenylene oligomers called H-resins were commercialized by Hercules, Inc., in 1974 (see review by P. M. Hergenrother).…”

Section: Synthesis Of Hyperbranched Polymersmentioning

confidence: 99%

Hyperbranched and Highly Branched Polymer Architectures—Synthetic Strategies and Major Characterization Aspects

2009

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Section: Synthesis Of Hyperbranched Polymersmentioning

confidence: 99%

Hyperbranched and Highly Branched Polymer Architectures—Synthetic Strategies and Major Characterization Aspects

2009

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“…By applying this reaction to diyne molecules, a large number of HBPs can be synthesized. First example of the synthesis of branched polyphenylenes via cyclotrimerization of diethynylbenzenes with phenylacetylenes was reported by Korshak in 1970s . Following studies involved the synthesis of hyperbranched polyphenylenes and –arylenes by diyne polycyclotrimerization initiated by transition‐metal catalysts …”

Section: Synthesis Of Hbps By Traditional Techniquesmentioning

confidence: 99%

Hyperbranched Polymers by Light‐Induced Self‐Condensing Vinyl Polymerization

Aydoğan

Çiftçi

Yaǧcı

2018

Macromol. Rapid Commun.

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Hyperbranched polymers (HBPs), a unique class of dendritic macromolecules, have received continuous interest from macromolecular scientists due to their inherent properties such as high level of functional terminal units, high solubility, and low viscosity. Despite enormous efforts devoted to the synthesis of HBPs by traditional methods such as single and double monomer strategies involving step-growth polymerization and self-condensing vinyl polymerization (SCVP) processes, there have been limited attempts to employ light-induced processes. Photochemical methods, however, exhibit distinct advantages not characteristically disclosed by traditional ones, such as spatial and temporal control, low energy, and site-specific activation. This review, after a brief summary of the conventional methods, presents the unique features and the key functionalities of the inimers for photoinduced SCVP and strategies for preparing HBPs.

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“…The morphological characteristics of PAA prepolymer and MVC discs surfaces and fractured surfaces were analyzed by scanning electron microscopy using a Jeol JSM 7000F and a Zeiss EVO LS-15 equipment, respectively. [13][14][15] .…”

Section: Characterizationmentioning

confidence: 99%

“…The cyclotrimerization is usually a nickel-catalyzed reaction in which three ethynyl groups are mostly linked together to form a benzene ring, as presented in Figure 1 [13][14][15] . The cyclotrimerization produces aromatic rings stabilized by resonance that improve the thermal stability of the system and increase the carbon yield during pyrolysis [14,16,17] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of polyarylacetylene for use in the monolithic vitreous carbon processing

et al. 2014

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Abstract:In this work, polyarylacetylene (PAA) prepolymer obtained from 1,4-diethynylbenzene was evaluated as polymeric precursor of monolithic vitreous carbon (MVC). The monomer 1,4-diethynylbenzene was synthesized and the PAA prepolymer was prepared with 13, 16 and 19 wt % of nickel catalyst. The best percentage of nickel catalyst considered was 13 wt %, due to the lower molecular weight and polydispersity index and higher carbon yield. The traditional production of MVC is obtained from phenolic and poly(furfuryl alcohol) resins, which require many hours to pyrolyze due to the large quantity of gases generated. Furthermore, the porosity is hard to control using these conventional resins. Polyarylacetylene releases little volatiles due to the polyaddition reaction and the aromatic rings in PAA chain also provide a high thermal stability, therefore the heat treatment could be faster without cracking the carbon material. This would also lower the cost of fabrication of MVC, in addition to the low porosity observed, making this polymer a good matrix for MVC.

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Polycyclotrimerization as a general route to polymers with rings in the chains

Abstract: Abstract

Cited by 18 publications

References 11 publications

Hyperbranched and Highly Branched Polymer Architectures—Synthetic Strategies and Major Characterization Aspects

Hyperbranched and Highly Branched Polymer Architectures—Synthetic Strategies and Major Characterization Aspects

Hyperbranched Polymers by Light‐Induced Self‐Condensing Vinyl Polymerization

Synthesis and characterization of polyarylacetylene for use in the monolithic vitreous carbon processing

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