Title: EFFECTS OF MOULDING CONDITION AND CURING ATMOSPHERE ON THE FLEXURAL PROPERTIES OF VINYL ESTER
Page Range: p.61-64
Author(s): Nouranian S; Lee J; Torres G W; Lacy T E; Toghiani H; Pittman Jr C U
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 21
Issue No: No.2
Abstract
The effects of moulding condition and curing atmosphere on the flexural properties of a neat 33 wt.%-styrene epoxy vinyl ester (VE) were investigated. Specimens were prepared using either open or closed moulds, and thermally cured under either air or nitrogen atmosphere. Four-point bending tests were performed with both the top (‘air-side’) and the bottom (‘mould-side’) surfaces of the cured specimens in tension. The mean flexural moduli for nitrogen-cured and closed-mould specimens were 3% and 9% higher than for air-cured specimens, respectively. However, the mean flexural strength for open-mould air-cured specimens with their air-sides loaded in tension were 65% lower than the mean flexural strengths of open-mould nitrogen-cured or closed-mould specimens. This likely resulted from partial VE resin curing inhibition due to oxygen diffusion into the free surface region of the open-mould air-cured specimens. This creates gradients in the local stiffness and strength in the near-surface region due to lower crosslink density. This effect may be particularly important for thin specimens. These results underscore the significance of exposure to air during open-mould curing on the cured VE flexural properties. Such assessments are crucial for composite part manufacturing utilizing VEs. 26 Refs.
Related reading
More journal reading and science coverage connected to this topic.
Design and simulation analysis of lightweight HDPE milk bottle
Title: Design and simulation analysis of lightweight HDPE milk bottle Page Range: p.91-98 Author(s): Hsing-Hui Huang; Li-Wen Chen; Wei-Hua Lu; Wei-Cheng Lin; Yung-Chuan Chen…
Mechanical property of multiwall carbon nanotube reinforced polymer composites
Title: Mechanical property of multiwall carbon nanotube reinforced polymer composites Page Range: p.99-104 Author(s): Chao-Kai Yang; Yu-Roung Lee; Tsung-Han Hsieh; Tao-Hsing Chen; Tsung-Chieh Cheng…
Design of radar absorbing structures utilizing carbon-based polymer composites
Title: Design of radar absorbing structures utilizing carbon-based polymer composites Page Range: p.105-110 Author(s): Sang-Young Kim; Sung-Soo Kim File size: Download the pdf (subscribers…