Chemorheological analysis of an epoxy‐novolac molding compound

Hsieh, Tar‐Hwa; Wang, T. L.; Ho, Ko‐Shan; Wang, Y. Z.

doi:10.1002/pen.11175

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…At the same time, the mathematical modeling of resin curing kinetics and viscosity fitting for the mould‐filling stage has attracted considerable attention of engineers and scientists, and the curing kinetics and the resulting viscosity changes of various epoxy resin systems have been studied, always by means of differential scanning calorimetry (DSC) [12–14]. Lawrence et al [15] developed a new viscosity model of a two‐part epoxy/amine during the resin flow process, without the need for determining the resin curing kinetics.…”

Section: Introductionmentioning

confidence: 99%

Correlation analysis of epoxy/amine resin cure, structure and chemorheological behavior in RTM processes

et al. 2011

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At the reactive mould‐filling stage in resin transfer moulding (RTM) processes, the correlation analysis of epoxy/amine resin cure, structure and chemorheological behavior plays a key role in the optimum control of RTM processes. A new methodology used to simulate the reactive resin flow in RTM processes with edge effect is presented in this article. The recursive approach and the branching theory are used to describe the evolution of molecular structure and resin viscosity, respectively. And then the resin flow process is simulated by means of a semi‐implicit iterative calculation method and the finite volume method. The results reveal the proposed resin cure‐structure‐viscosity model provides excellent agreement with the experimental viscosity data during the RTM filling process. It is also observed that the curing reaction causes the inhomogeneous distribution of resin conversion and resin molecular weight in the mould cavity, which will result in the spatially structural and performance inhomogeneities in the finished products. With the injection temperature or the edge width increasing, the discrepancy of resin conversion and resin molecular weight in the mould cavity is more evident. This study is helpful for understanding the complicated relationship among the processing variables, resin structures, and properties. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Correlation analysis of epoxy/amine resin cure, structure and chemorheological behavior in RTM processes

et al. 2011

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“…However, the broad application of ENR is limited by their poor liquidity properties at room temperature and as well as need to be heat cured [33]. For that matter, only low molecular weight and linear macromolecular chain resins are applied [34]. This study was directed at expanding the applications limits of ENR using a branched epoxy novolac polymer, a cationic photoinitiator additive, and applying a UV-light photocuring technology with future possible applications as coating formulations in the maritime and the energy industry sectors.…”

mentioning

confidence: 99%

UV-light-induced curing of branched epoxy novolac resin for coatings

Gaidukovs¹,

Medvids²,

Onufrijevs³

et al. 2018

Express Polym. Lett.

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Usually, the processing technology of the thermoset polymers is characterized by the use of the two component formulations, which generally consist of a polymer resin and a hardener. These two component polymer formulations need to be hardened for almost 12 hours at room temperature [1, 2]. Generally, extra heating at 60-160°C is necessary to facilitate the hardening process [3]. The conventional curing process has several relevant disadvantages. Firstly, as the prerequisite condition for acceptable final properties of the produced material, the following thermal treatment is always desirable as a post-curing process [4]. Secondly, there are difficulties with producing large monolith constructions and coating large surfaces that can be sensitive to heating and/or when heating is even impossible [5]. For example, the repair service protective coatings applications for ships in the maritime industry, and for power generators in the energy generation sector [6]. The market of ultraviolet (UV) curable polymers is growing very rapidly, especially in the last decades [7]. This market is anticipated to grow by 7.0% from 2013 to 2019 and is expected to reach USD 7.930

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“…A range of rheology models have been presented for the viscosity of epoxy resin during the liquid composite moulding process, including empirical models [4][5][6][7][8] , probability based models [9] , gelation models [10] , and models based on free volume analysis [11] . For isothermal cure, the predominant models are the empirical models.…”

Section: Introductionmentioning

confidence: 99%

“…For isothermal cure, the predominant models are the empirical models. The most used empirical models for the epoxy resin are the dual-Arrhenius rheological model [4,5] and the engineering viscosity model [12] , as they can be established to predict the viscosity without the need for determining the resin cure kinetics [7,13] . The equations of them are simple and the model parameters can be obtained from isothermal viscosity-time measurements further more.…”

Section: Introductionmentioning

confidence: 99%

Rheological behaviors and processing windows of low viscosity epoxy resin for VIMP

Liu

Zeng

Xiao

et al. 2011

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The chemorheological behaviors of a low viscosity epoxy resin system (Huntsman 1564/3486) for vacuum infusion moulding process (VIMP) were studied with viscosity experiments. The dual-Arrhenius rheological model and the engineering viscosity model were established and compared with the experimental data. The result showed that the viscosity in the earlier stage calculated by dual-Arrhenius model were smaller than the experimental data, while the data calculated by the engineering model were larger. Combining the two models together can predict the rheological behaviors of the resin system in a more credible manner. The processing windows of the resin system for VIMP were determined based on the two models. The optimum processing temperature is 30-45 ℃.

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Chemorheological analysis of an epoxy‐novolac molding compound

Cited by 9 publications

References 23 publications

Correlation analysis of epoxy/amine resin cure, structure and chemorheological behavior in RTM processes

Correlation analysis of epoxy/amine resin cure, structure and chemorheological behavior in RTM processes

UV-light-induced curing of branched epoxy novolac resin for coatings

Rheological behaviors and processing windows of low viscosity epoxy resin for VIMP

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