Curing behavior of epoxy resins in two-stage curing process by non-isothermal differential scanning calorimetry kinetics method

2014 ◽  
Vol 131 (17) ◽  
pp. n/a-n/a ◽  
Author(s):  
He Sun ◽  
Yuyan Liu ◽  
Youshan Wang ◽  
Huifeng Tan
Keyword(s):  
Differential Scanning Calorimetry ◽  
Epoxy Resins ◽  
Curing Process ◽  
Scanning Calorimetry ◽  
Two Stage ◽  
Curing Behavior

scholarly journals Kinetic Analysis of the Curing Process of Biobased Epoxy Resin from Epoxidized Linseed Oil by Dynamic Differential Scanning Calorimetry

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1279
Author(s):  
Diego Lascano ◽  
Alejandro Lerma-Canto ◽  
Vicent Fombuena ◽  
Rafael Balart ◽  
Nestor Montanes ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Linseed Oil ◽  
Single Step ◽  
Curing Process ◽  
Heating Rates ◽  
Scanning Calorimetry ◽  
Step Process ◽  
Epoxidized Linseed Oil

The curing process of epoxy resin based on epoxidized linseed oil (ELO) is studied using dynamic differential scanning calorimetry (DSC) in order to determine the kinetic triplet (Ea, f(α) and A) at different heating rates. The apparent activation energy, Ea, has been calculated by several differential and integral isoconversional methods, namely Kissinger, Friedman, Flynn–Wall–Ozawa (FWO), Kissinger–Akahira–Sunose (KAS) and Starink. All methods provide similar values of Ea (between 66 and 69 kJ/mol), and this shows independence versus the heating rate used. The epoxy resins crosslinking is characterized by a multi-step process. However, for the sake of the simplicity and to facilitate the understanding of the influence of the oxirane location on the curing kinetic, this can be assimilated to a single-step process. The reaction model has a high proportion of autocatalytic process, fulfilling that αM is between 0 and αp and αM < αp∞. Using as reference the model proposed by Šesták–Berggren, by obtaining two parameters (n and m) it is possible to obtain, on the one hand, the kinetic parameters and, on the other hand, a graphical comparison of the degree of conversion, α, versus temperature (T) at different heating rates with the average n and m values of this model. The good accuracy of the proposed model with regard to the actual values obtained by DSC gives consistency to the obtained parameters, thus suggesting the crosslinking of the ELO-based epoxy has apparent activation energies similar to other petroleum-derived epoxy resins.

scholarly journals Improved Processing and Properties for Polyphenylene Oxide Modified by Diallyl Orthophthalate Prepolymer

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2016
Author(s):  
Honghua Wang ◽  
Qilin Mei ◽  
Yujie Ding ◽  
Zhixiong Huang ◽  
Minxian Shi
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Phase Separation ◽  
Dilution Effect ◽  
Gradual Decrease ◽  
Gel Point ◽  
Dynamic Mode ◽  
Curing Process ◽  
Scanning Calorimetry ◽  
Polyphenylene Oxide

Diallyl orthophthalate (DAOP) prepolymer was investigated as a reactive plasticizer to improve the processability of thermoplastics. The rheology of blends of DAOP prepolymer initiated by 2,3-dimethyl-2,3-diphenylbutane (DMDPB) and polyphenylene oxide (PPO) was monitored during the curing process, and their thermal properties and morphology in separated phases were also studied. Differential scanning calorimetry (DSC) results showed that the cure degree of the reactively plasticized DAOP prepolymer was reduced with increasing PPO due to the dilution effect. The increasing amount of the DAOP prepolymer led to a gradual decrease in the viscosity of the blends and the rheology behavior was consistent with the chemical gelation of DAOP prepolymer in blends. This indicated that the addition of the DAOP prepolymer effectively improved processability. The phase separation occurring during curing of the blend and the transition from the static to dynamic mode significantly influences the development of the morphology of the blend corresponding to limited evolution of the conversion around the gel point.

scholarly journals Heat Curing Behavior of Light-cured Composite Resins Investigated by Dynamic Differential Scanning Calorimetry

1990 ◽  
Vol 9 (2) ◽  
pp. 153-162,228 ◽  
Author(s):  
Seiji BAN ◽  
Yosifumi TAKAHASHI ◽  
Hiroaki TANASE ◽  
Jiro HASEGAWA
Keyword(s):  
Differential Scanning Calorimetry ◽  
Composite Resins ◽  
Scanning Calorimetry ◽  
Curing Behavior ◽  
Heat Curing

Thermal Behavior of Epoxy Resins Cured with an Amine-Containing, Thermoplastic Poly(arylene Ether Sulphone)

1999 ◽  
Vol 19 (3) ◽  
pp. 161-174 ◽  
Author(s):  
Oriana Motta ◽  
Antonino Rocca ◽  
Valentina Siracusa ◽  
Domenico Acierno
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Behavior ◽  
Kinetic Parameters ◽  
Epoxy Resins ◽  
Curing Agent ◽  
Cure Process ◽  
Scanning Calorimetry ◽  
Arylene Ether ◽  
Diaminodiphenyl Methane ◽  
Residual Heat

Abstract In this paper we carried out the crosslinking of the tetraglycidyl-4,4′- diaminodiphenyl methane epoxy resin by using a reactive poly(arylene ether sulphone) as curing agent. Differential scanning calorimetry was used to derive the kinetic parameters of the reactions involved in the cure process and to evaluate the extent of the reaction as a function of time by measuring the total (ΔHr) and the residual heat(ΔHresid) of the resin at different curing times. A comparatively slower reaction was found to take place when the resin was cured with the poly(arylene ether sulphone) that when it was cured with the conventional curing agent 4,4′-diaminodiphenyl sulphone.

Curing behavior of a novolac-type phenolic resin analyzed by differential scanning calorimetry

2003 ◽  
Vol 90 (6) ◽  
pp. 1678-1682 ◽  
Author(s):  
Eliton S. De Medeiros ◽  
Jos� A. M. Agnelli ◽  
Kuruvilla Joseph ◽  
Laura H. De Carvalho ◽  
Luiz H. C. Mattoso
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phenolic Resin ◽  
Scanning Calorimetry ◽  
Curing Behavior
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