Intermolecular reaction kinetics for the PGE/NMA/BDMA anhydride-cured epoxy

Nielsen, Justin; Chen, S. J.; Timm, D. C.

doi:10.1021/ma00058a027

Cited by 21 publications

(33 citation statements)

References 6 publications

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“…Previous studies using phenyl glycidyl ether and different cyclic anhydrides using tertiary amines as catalyst reported high molecular weight polymers with a distribution consistent with a living polymerization with slow initiation, but in other cases considerably lower molecular weights were reported . It has been found that side reactions may occur preventing the formation of high molecular weight polymers, depending also on the choice of tertiary amine and impurities present in the reagents .…”

Section: Resultsmentioning

confidence: 98%

From curing kinetics to network structure: A novel approach to the modeling of the network buildup of epoxy–anhydride thermosets

Fernández‐Francos

Ramis

Serra

2013

J. Polym. Sci. Part A: Polym. Chem.

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The curing kinetics and network buildup during curing\ud of epoxy–anhydride formulations using tertiary amines as\ud initiators are reviewed in this work. A mechanism-based kinetic\ud and structural model has been defined, showing better prediction\ud capabilities than previous living polymerization and simple\ud regeneration models. The curing kinetics have been analyzed\ud using differential scanning calorimetry (DSC), and the gelation\ud during curing has been determined by combined thermomechanical\ud analysis and DSC. The effect of initiator content and\ud epoxy equivalent weight are taken into account. The network\ud buildup has been modeled using a stochastic network buildup\ud model based on the random combination of primary chains\ud generated by the kinetic model.Postprint (published version

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Section: Resultsmentioning

confidence: 98%

From curing kinetics to network structure: A novel approach to the modeling of the network buildup of epoxy–anhydride thermosets

Fernández‐Francos

Ramis

Serra

2013

J. Polym. Sci. Part A: Polym. Chem.

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“…It is known that regeneration of the tertiary amine can increase the gel point conversion because of the increase in the number of chain ends. The presence of known or unknown impurities in the reagents has also been claimed to be the reason for deviations from the expected behavior . Steinmann claimed that both the reagents purity and the choice of initiator, leading to side reactions, had a strong influence on the polymerization process of epoxy‐anhydride formulations .…”

Section: Resultsmentioning

confidence: 99%

Cure kinetics modeling and thermomechanical properties of cycloaliphatic epoxy-anhydride thermosets modified with hyperstar polymers

Belmonte

Däbritz

Ramis

et al. 2014

J. Polym. Sci. Part B: Polym. Phys.

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Hyperstar polymers (HSPs) with hyperbranched aromatic polyester core and arms consisting of block copolymers of poly(methyl methacrylate) and poly(hydroxyethyl methacrylate) have been used as polymeric modifiers in cycloaliphatic epoxy-anhydride formulations catalyzed with tertiary amines, with the purpose of enhancing the impact strength of the resulting materials without compromising other thermal and mechanical properties.> In this work, the effect of these polymeric modifiers on the curing kinetics, processing, thermal-mechanical properties and thermal stability has been studied using thermal analysis techniques such as DSC, TMA, DMA, and TGA. The morphology of the cured materials has been analyzed with SEM. The curing kinetics has been analyzed by isoconversional procedures and phenomenological kinetic models taking into account the vitrification during curing, and the degradation kinetics has been analyzed by means of isoconversional procedures, summarizing the results in a time-temperature-transformation (TTT) diagram. The results show that HSPs participate in the crosslinking process due to the presence of reactive groups, without compromising significantly their thermal-mechanical properties. The modified materials show a potential toughness enhancement produced by the formation of a nano-grained morphology. The TTT diagram is shown to be a useful tool for the optimization of the curing schedule in terms of curing completion and safe processing window, as well as for defining storage stability conditions. (C) 2014 Wiley Periodicals, Inc.Postprint (published version

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“…Samples (Ӎ0.1 g) were analyzed through end-group analysis and gel permeation chromatography (GPC). 15,16 The reactor apparatus consisted of a 100-cc round, Pyrex glass flask. A glass tube about 10 cm long was used to admit a stream of nitrogen to bubble through the molten resin.…”

Section: Thermoplastic Resinmentioning

confidence: 99%

Z‐protected glutamic acid‐based biodegradable thermoplastic and thermosetting polyesters: Synthesis and characterization

Tadros

Noureddini

Timm

1999

J. Appl. Polym. Sci.

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Biodegradable polymers were formed from N-benzyloxycarbonyl-L-glutamic acid with the comonomers ethylene glycol, diglycidyl ether of 1,4-butanediol, and diglycidyl ether of bisphenol A. The three polymers were a linear and a crosslinked heterochain polyester and a crosslinked polyester that contained aromatic units within its network chains. The thermoplastic resin and the soluble fractions for the thermosetting resins were characterized by gel permeation chromatography. Conversions for carboxylic acid were determined by titrations. A quality, 22,000 molecular weight thermoplastic resin was formed. The two thermosets were cured past their gel points. Gelation analysis revealed that the relative rate constants for the sequential oxirane/ acid and alcohol/acid reactions were distinct. With diglycidyl ether of 1,4-butanediol, the ratio of the respective rate constants was 3; with diglycidyl ether of bisphenol A, the ratio approached 200. The resins hydrolyzed to monomers in the presence of lipase, but in the presence of a mixed microbial culture, only the first two resins decayed to biomass, respiratory gases, and water. The third resin was inert during the period of observation.

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Intermolecular reaction kinetics for the PGE/NMA/BDMA anhydride-cured epoxy

Cited by 21 publications

References 6 publications

From curing kinetics to network structure: A novel approach to the modeling of the network buildup of epoxy–anhydride thermosets

From curing kinetics to network structure: A novel approach to the modeling of the network buildup of epoxy–anhydride thermosets

Cure kinetics modeling and thermomechanical properties of cycloaliphatic epoxy-anhydride thermosets modified with hyperstar polymers

Z‐protected glutamic acid‐based biodegradable thermoplastic and thermosetting polyesters: Synthesis and characterization

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