Morphology of rubber-modified vinyl ester resins cured at different temperatures

2003 ◽  
Vol 89 (1) ◽  
pp. 274-283 ◽  
Author(s):  
Mar�a L. Auad ◽  
Julio Borrajo ◽  
Mirta I. Aranguren
Keyword(s):  
Vinyl Ester ◽  
Different Temperatures ◽  
Vinyl Ester Resins

Effects of additives on the cure kinetics of vinyl ester pultrusion resins

2021 ◽  
pp. 002199832110015
Author(s):  
Alexander Vedernikov ◽  
Yaroslav Nasonov ◽  
Roman Korotkov ◽  
Sergey Gusev ◽  
Iskander Akhatov ◽  
...  
Keyword(s):  
Vinyl Ester ◽  
Mean Squared Error ◽  
Cure Kinetics ◽  
Zinc Stearate ◽  
Heating Rates ◽  
Scanning Calorimetry ◽  
Different Temperatures ◽  
Predicted Values ◽  
Kinetics Of ◽  
Final Degree

Pultrusion is a highly efficient composite manufacturing process. To accurately describe pultrusion, an appropriate model of resin cure kinetics is required. In this study, we investigated cure kinetics modeling of a vinyl ester pultrusion resin (Atlac 430) in the presence of aluminum hydroxide (Al(OH)3) and zinc stearate (Zn(C18H35O2)2) as processing additives. Herein, four different resin compositions were studied: neat resin composition, composition with Al(OH)3, composition comprising Zn(C18H35O2)2, and composition containing both Al(OH)3 and Zn(C18H35O2)2. To analyze each composition, we performed differential scanning calorimetry at the heating rates of 5, 7.5, and 10 K/min. To characterize the cure kinetics of Atlac 430, 16 kinetic models were tested, and their performances were compared. The model based on the [Formula: see text]th-order autocatalytic reaction demonstrated the best results, with a 4.5% mean squared error (MSE) between the experimental and predicted data. This study proposes a method to reduce the MSE resulting from the simultaneous melting of Zn(C18H35O2)2. We were able to reduce the MSE by approximately 34%. Numerical simulations conducted at different temperatures and pulling speeds demonstrated a significant influence of resin composition on the pultrusion of a flat laminate profile. Simulation results obtained for the 600 mm long die block at different die temperatures (115, 120, 125, and 130 °C) showed that for a resin with a final degree of cure exceeding 95% at the die exit, the maximum difference between the predicted values of pulling speed for a specified set of compositions may exceed 1.7 times.

scholarly journals Microstructural Dependency of Diffusion in Glass Flake-Reinforced Vinyl Ester Resins

2012 ◽  
Vol 12 (1) ◽  
pp. 11 ◽  
Author(s):  
Bryan B. Pajarito ◽  
Masatoshi Kubouchi ◽  
Hiroyuki Tomita ◽  
Saiko Aoki
Keyword(s):  
Random Walk ◽  
Aspect Ratio ◽  
Vinyl Ester ◽  
Volume Fraction ◽  
Chemical Diffusion ◽  
High Volume ◽  
Diffusion Models ◽  
Simple Diffusion ◽  
Glass Flake ◽  
Vinyl Ester Resins

Vinyl ester resins are utilized for long-term corrosion protection of metal, alloy, and concrete substrates against concentrated acids, alkalis, and solvents at high temperature. Glass flakes are usually added as fillers to reduce chemical diffusion within the vinyl ester matrix. A common industry practice is to use glass flakes with large aspect ratio, high volume fraction, and in parallel alignment to surface in chemical contact for barrier applications. During processing and curing of glass flake-filled vinyl ester resins, irregular microstructures such as reduced flake aspect ratio and random orientation of flakes are commonly observed. Such microstructures can affect the overall chemical diffusion, resulting to barrier properties less predictable by simple diffusion models. Therefore, in this study, a simple 2D random walk simulation procedure is used in attempt to estimate the microstructural dependency of diffusion in glass flake-reinforced vinyl ester resins. While the random walk simulations are in good agreement with the tortuosity-based diffusion models in terms of microstructural effects, in most cases the simulation results are inconsistent with the experimental measurements of acid diffusion in glass flake-filled vinyl ester resins. A possible cause for this is the poor adherence of vinyl ester resin to glass flakes. Osmotic cracks are also formed during immersion which also influences overall diffusion through the material.

Emission modeling of styrene from vinyl ester resins with low hazardous air pollutant contents

2008 ◽  
Vol 11 (3) ◽  
pp. 283-292 ◽  
Author(s):  
John J. La Scala ◽  
Joshua A. Orlicki ◽  
Rahul Jain ◽  
Chad A. Ulven ◽  
Giuseppe R. Palmese ◽  
...  
Keyword(s):  
Vinyl Ester ◽  
Air Pollutant ◽  
Emission Modeling ◽  
Hazardous Air Pollutant ◽  
Vinyl Ester Resins

K-0902 Effect of Post-cure on Mechanical Properties of Vinyl-ester Resins

2001 ◽  
Vol I.01.1 (0) ◽  
pp. 485-486
Author(s):  
Takao OTA ◽  
Takashi MATSUOKA ◽  
Kazuhiko SAKAGUCHI
Keyword(s):  
Mechanical Properties ◽  
Vinyl Ester ◽  
Vinyl Ester Resins
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