Influence of end groups in hyperbranched polyesters used as modifiers in the characteristics of epoxy thermosets cured by adipic dihydrazide

Tomuta, Adrian M.; Ramis, Xavier; Flor, Silvia De la; Serra, Àngels

doi:10.3144/expresspolymlett.2013.57

Cited by 10 publications

(5 citation statements)

References 31 publications

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“…On the one hand, aromatic anhydride fragments in the modifiers P and N have larger electron affinity and, therefore, larger reactivity relative to nucleophiles than aliphatic anhydride fragments in IMTHPA. On the other hand, viscosity of the reaction mixture increases with an increase of modifier content, especially, in the EP series, which can delay the curing process (see, for example, [31]). As a result, all formulations under consideration have similar temperatures and heats of the reaction.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of epoxy-anhydride polymers modified by polyfluoroaromatic oligoimides

et al. 2014

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Technique of the preparation of the anhydrideterminated polyfluoroaromatic oligoimides from tetrafluorophenylene or hexafluoronaphthylene diamines and oxydiphthalic anhydride was elaborated. These compounds were used as modifiers and cohardeners for an epoxyanhydride formulation composed of resin DGEBA and isomethyltetrahydrophthalic anhydride. Curing parameters of the modified epoxy-imide formulations were investigated using DSC, DMA, and FTIR spectroscopy. The modified epoxy polymers containing the polyfluoroaromatic imide fragments have improved thermomechanical and thermooxidative characteristics and hydrophobicity. The modifiers exert a positive effect on the elastic modulus, flexural strength, and dielectric permittivity of the epoxy-anhydride polymers when their amount reaches 20-30 pbw. The anhydride-terminated polyfluoroaromatic oligoimides appears to be promising for the preparation of epoxy polymers with improved performance.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of epoxy-anhydride polymers modified by polyfluoroaromatic oligoimides

et al. 2014

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“…26 respectively. They have been very scarcely described in the scientific literature but reports demonstrate they provide formulations with strong latent character in the thermal curing of DGEBA [135][136][137]. Interestingly, they are easily synthesized from the corresponding diacids and are available with very different chemical structures [40].…”

Section: Page 16 Of 163mentioning

confidence: 97%

Control of reactions and network structures of epoxy thermosets

Vidil¹,

Tournilhac²,

Musso

et al. 2016

Progress in Polymer Science

312

252

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Recent advances in macromolecular chemistry have revolutionized the way we perceive the synthesis of polymers. Polymerization, to be modern, must be "controlled", which usually means capable of producing macromolecules of well-defined structure. The purpose of this review is to examine how the chemistry of epoxy resins, an almost century-old chemistry, is also involved in this movement. Epoxy resins are characterized by both the flexibility of implementation and the qualities of the polymers obtained. Key materials in health-, mobility-and energy related technologies, these resins are heavily present in high-performance composites, electronic boards, adhesives and coatings. Currently, a large number of resins and hardeners are available on the market or described in the literature and an interesting point is that almost any combination of the two is possible. Common to all these recipes and processes is that a liquid (or soluble) resin at some point becomes insoluble and solid. It is very important to know how to manage this transition, physically known as the gel point, as it is the point after which the shape of the object is irreversibly set. Taking into account the variety of epoxy polymerization processespolyaddition, anionic or cationic polymerization-we detail a number of methods to program the occurrence of the gel point and how this type of control affects the structure of the growing network.

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“…In addition, the HBPs led to a considerable decrease in the T g . To solve these issues, the same authors used allyl and 10-undecenoyl modified hyperbranched poly(glycidol) as modifiers of DGEBA thermosets cured by adipic dihydrazide [ 85 ]. Dihydrazides possess a high crystalline character and they are difficult to disperse or dissolve because melting the curing process is extremely fast.…”

Section: Effect Of the Addition Of Hbps Or Masps On The Curing Processmentioning

confidence: 99%

Enhancement of Epoxy Thermosets with Hyperbranched and Multiarm Star Polymers: A Review

Santiago

Serra

2022

Polymers

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Hyperbranched polymers and multiarm star polymers are a type of dendritic polymers which have attracted substantial interest during the last 30 years because of their unique properties. They can be used to modify epoxy thermosets to increase their toughness and flexibility but without adversely affecting other properties such as reactivity or thermal properties. In addition, the final properties of materials can be tailored by modifying the structure, molecular weight, or type of functional end-groups of the hyperbranched and multiarm star polymers. In this review, we focus on the modification of epoxy-based thermosets with hyperbranched and multiarm star polymers in terms of the effect on the curing process of epoxy formulations, thermal, mechanical, and rheological properties, and their advantages in fire retardancy on the final thermosets.

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Influence of end groups in hyperbranched polyesters used as modifiers in the characteristics of epoxy thermosets cured by adipic dihydrazide

Cited by 10 publications

References 31 publications

Synthesis and characterization of epoxy-anhydride polymers modified by polyfluoroaromatic oligoimides

Synthesis and characterization of epoxy-anhydride polymers modified by polyfluoroaromatic oligoimides

Control of reactions and network structures of epoxy thermosets

Enhancement of Epoxy Thermosets with Hyperbranched and Multiarm Star Polymers: A Review

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