Characterisation of Curing of Vinyl Ester Resin in an Industrial Pultrusion Process: Influence of Die Temperature
Article
Chaparala, Sai Ajay Chandra, Alajarmeh, Omar, Shelley, Tristan, Zeng, Xuesen, Rendle-Short, Kendric, Voice, Dean and Schubel, Peter. 2023. "Characterisation of Curing of Vinyl Ester Resin in an Industrial Pultrusion Process: Influence of Die Temperature." Polymers. 15 (18). https://doi.org/10.3390/polym15183808
| Article Title | Characterisation of Curing of Vinyl Ester Resin in an Industrial Pultrusion Process: Influence of Die Temperature |
|---|---|
| ERA Journal ID | 201391 |
| Article Category | Article |
| Authors | Chaparala, Sai Ajay Chandra, Alajarmeh, Omar, Shelley, Tristan, Zeng, Xuesen, Rendle-Short, Kendric, Voice, Dean and Schubel, Peter |
| Journal Title | Polymers |
| Journal Citation | 15 (18) |
| Number of Pages | 16 |
| Year | 2023 |
| Publisher | MDPI AG |
| Place of Publication | Switzerland |
| ISSN | 2073-4360 |
| Digital Object Identifier (DOI) | https://doi.org/10.3390/polym15183808 |
| Web Address (URL) | https://www.mdpi.com/2073-4360/15/18/3808 |
| Abstract | Pultrusion is a high-volume manufacturing process for Fibre-Reinforced Polymer (FRP) composites. It requires careful tuning and optimisation of process parameters to obtain the maximum production rate. The present work focuses on the correlation between the set die temperatures of 80 °C, 100 °C, 120 °C, and 140 °C and the resin cure state at constant pull speeds. Lab-scale oven trials were conducted to understand the thermal behaviour of the resin system and to provide a temperature range for the pultrusion trials. Dielectric Analysis (DEA) was used during pultrusion trials to monitor the effect of die temperature on the cure progression. The DEA results showed that, by increasing die temperature, the exothermic peak shifts closer towards the die entry. Moreover, the degree of cure for samples processed at 140 °C was 97.7%, in comparison to 86.2% for those cured at 100 °C. The rate of conversion and the degree of cure correspond directly to the set die temperatures of the pultrusion trials, contributing to understanding the effect of die temperature on cure progression. Mechanical and thermal material properties were measured. Samples cured at 120 °C showed the highest mechanical performance, exceeding those cured at 140 °C, linked to the generation of higher internal stress due to the higher rate of conversion. This work can be used as a guide for pultruded composite sections, to understand the cure behaviour of resin systems under various applied temperatures and the impact of the die temperature conditions on thermal and mechanical properties. |
| Keywords | cure behaviour; pultrusion; mechanical and thermal properties; permittivity and ion viscosity; exothermic reaction; cure behaviour; DEA |
| ANZSRC Field of Research 2020 | 401602. Composite and hybrid materials |
| Byline Affiliations | Centre for Future Materials |
| Institute for Advanced Engineering and Space Sciences | |
| Centre for Future Materials (Research) | |
| Wagners Composite Fibre Technologies, Australia | |
| Allnex Composites, Australia |
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