Studies on the cure kinetics of chitosan-glutamic acid using glutaraldehyde as crosslinker through differential scanning calorimeter

2008 ◽  
Vol 108 (1) ◽  
pp. 681-688 ◽  
Author(s):  
Kamlesh Kumari ◽  
K. K. Raina ◽  
P. P. Kundu
Keyword(s):  
Glutamic Acid ◽  
Differential Scanning Calorimeter ◽  
Cure Kinetics ◽  
Kinetics Of

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.

Nonisothermal cure kinetics of epoxy/Zn Fe3-O4 nanocomposites

2019 ◽  
Vol 136 ◽  
pp. 105290 ◽  
Author(s):  
Maryam Jouyandeh ◽  
Zohre Karami ◽  
Samir M. Hamad ◽  
Mohammad Reza Ganjali ◽  
Vahideh Akbari ◽  
...  
Keyword(s):  
Cure Kinetics ◽  
Kinetics Of ◽  
Nonisothermal Cure

Kinetics of Se75S25−xCdx glassy system using differential scanning calorimeter

2009 ◽  
Vol 484 (1-2) ◽  
pp. 649-653 ◽  
Author(s):  
Shamshad A. Khan ◽  
F.S. Al-Hazmi ◽  
A.S. Faidah ◽  
S.J. Yaghmour ◽  
Ali M. Al-Sanosi ◽  
...  
Keyword(s):  
Differential Scanning Calorimeter ◽  
Glassy System ◽  
Kinetics Of

Study on optimal conditions and adsorption kinetics of copper from water by collodion membrane cross-linked poly-γ-glutamic acid

2013 ◽  
Vol 30 (6) ◽  
pp. 1295-1300
Author(s):  
Xiangting Wu ◽  
Aiyin Wang ◽  
Xiaojie Zheng ◽  
Guoxing Li ◽  
Xinjiao Dong ◽  
...  
Keyword(s):  
Glutamic Acid ◽  
Adsorption Kinetics ◽  
Optimal Conditions ◽  
Kinetics Of

Investigating the relationship between tack and degree of conversion in DGEBA-based epoxy resin cured with dicyandiamide and diuron

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali Kuliaei ◽  
Iraj Amiri Amraei ◽  
Seyed Rasoul Mousavi
Keyword(s):  
Epoxy Resin ◽  
Reaction Order ◽  
Theoretical Data ◽  
Cure Kinetics ◽  
Diglycidyl Ether ◽  
Degree Of Conversion ◽  
Ozawa Method ◽  
Heating Rates ◽  
Scanning Calorimetry ◽  
Kinetics Of

Abstract The purpose behind this research was to determine the optimum formulation and investigate the cure kinetics of a diglycidyl ether of bisphenol-A (DGEBA)-based epoxy resin cured by dicyandiamide and diuron for use in prepregs. First, all formulations were examined by the tensile test, and then, the specimens with higher mechanical properties were further investigated by viscometry and tack tests. The cure kinetics of the best formulation (based on tack test) in nonisothermal mode was investigated using differential scanning calorimetry at different heating rates. Kissinger and Ozawa method was used for determining the kinetic parameters of the curing process. The activation energy obtained by this method was 71.43 kJ/mol. The heating rate had no significant effect on the reaction order and the total reaction order was approximately constant ( m + n ≅ 2.1 $m+n\cong 2.1$ ). By comparing the experimental data and the theoretical data obtained by Kissinger and Ozawa method, a good agreement was seen between them. By increasing the degree of conversion, the viscosity decreased; as the degree of conversion increased, so did the slope of viscosity. The results of the tack test also indicated that the highest tack could be obtained with 25% progress of curing.

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