Curing Mechanism Study for Dual Cure of Epoxy Adhesive by Differential Scanning Calorimetry

2016 ◽  
Vol 864 ◽  
pp. 3-7
Author(s):  
Waefatimah Waenawae ◽  
Santi Pumkrachang ◽  
Syahril bin Zainudin ◽  
Thammasit Vongsetskul ◽  
Tanakorn Osotchan
Keyword(s):  
Differential Scanning Calorimetry ◽  
Uv Light ◽  
Heating Time ◽  
Epoxy Adhesive ◽  
Curing Process ◽  
Mechanism Study ◽  
Scanning Calorimetry ◽  
Heat Curing ◽  
Heat Cure ◽  
Curing Mechanism

Epoxy adhesive used in electronic packaging could normally be cured by ultraviolet light, heat at high temperature or dual cured by both processes. Differential scanning calorimetry (DSC) has been used to identify and analyze the occurred reaction during the curing process. The structural modification of epoxy during curing could be examined by measuring its thermal properties, and the change in molecular structure of epoxy could be observed by a relative small area of DSC peak. This provided the heat amount required for complete cure. It is found that the DSC peak area after heat cure at 90 °C increased linearly as a function of heating time while that at 120 °C decreased exponentially. For UV cure, it indicated that the curing mechanism was strongly depend on the energy from UV light. For dual cure at 90 °C, the heat curing time could be reduced from single curing process of 50 minutes to 6 minutes, while the heating time for dual cure at 120 °C could be reduced from 4 minutes to 2 minutes.

THE DIFFERENTIAL SCANNING CALORIMETRY APPLICATION FOR KINETIC REGULARITIES INVESTIGATION OF THE EPOXY ADHESIVE VK-36R CURING PROCESS

2015 ◽  
Vol 0 (1) ◽  
pp. 12-12
Author(s):  
E.U. Chutskova ◽  
◽  
V.M. Aleksashin ◽  
D.Y. Barinov ◽  
L.A. Dementieva ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Epoxy Adhesive ◽  
Curing Process ◽  
Scanning Calorimetry

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

NS-100 Membranes for Reverse Osmosis Applications

1975 ◽  
Vol 97 (1) ◽  
pp. 220-223 ◽  
Author(s):  
L. T. Rozelle ◽  
C. V. Kopp ◽  
J. E. Cadotte ◽  
K. E. Cobian
Keyword(s):  
Experimental Data ◽  
Reverse Osmosis ◽  
Curing Process ◽  
Water Fluxes ◽  
Cross Link ◽  
Heat Curing ◽  
Heat Cure ◽  
Removal Of Impurities ◽  
Varying Environments

The structure of the new NS-100 nonpolysaccharide reverse osmosis membranes and additional separation properties relating to removal of impurities from water has been investigated. Infrared spectrophotometric evidence has indicated that the urea linkages are formed before the heat cure step. The heat curing process was found to cross-link the polymer further by elimination of ammonia and formation of additional secondary and tertiary amine linkages. Long-term tests under seawater conditions have indicated water fluxes of 18 gfd at 99.5 percent salt rejection. The NS-100 membranes have exhibited high rejections toward organic compounds; for example, phenol is rejected up to 90 percent. All experimental data indicate that the NS-100 membranes are more resistant to varying environments with higher reverse osmosis performance than any current commercial membrane.

Study on Curing Mechanism of Azo-Containing Twin Liquid Crystalline Epoxy Resins with Anhydride

2013 ◽  
Vol 702 ◽  
pp. 119-122
Author(s):  
Teng Fei Shen ◽  
Fa Chao Wu ◽  
Ying Juan Sun
Keyword(s):  
Differential Scanning Calorimetry ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Curing Kinetics ◽  
Scanning Calorimetry ◽  
Curing Reaction ◽  
Azo Group ◽  
Liquid Crystalline Epoxy ◽  
Curing Mechanism ◽  
Kinetics Of

A series of novel azo-containing twin liquid crystalline (LC) epoxy monomers were cured with anhydrides without extra catalyst and the curing kinetics was investigated by non-isothermal differential scanning calorimetry (DSC) technique. The effect of Azo group on the Curing Kinetics of Epoxy/anhydride System was investigated and the result showed that Azo group served as a catalyst to accelerate the curing reaction. The curing mechanism was confirmed by the UV-Vis spectrum.

Effect of sonication and clay content on the properties of unsaturated polyester/montmorillonite nanocomposites

2016 ◽  
Vol 51 (2) ◽  
pp. 187-197 ◽  
Author(s):  
Daiane Romanzini ◽  
Adriana A Silva ◽  
Bluma G Soares ◽  
Ademir J Zattera ◽  
Sandro C Amico
Keyword(s):  
Differential Scanning Calorimetry ◽  
Coefficient Of Thermal Expansion ◽  
Unsaturated Polyester ◽  
Clay Content ◽  
Curing Process ◽  
Scanning Calorimetry ◽  
Mechanical Stirring ◽  
Curing Characteristics ◽  
Cloisite 30B ◽  
Montmorillonite Nanocomposites

The aim of this work is to evaluate the effect of sonication and clay content on the crosslinking and curing characteristics and the final properties of unsaturated polyester/montmorillonite nanocomposites. The Cloisite 30B clay (1, 3 or 5 wt.%) was dispersed in the resin by mechanical stirring and sonication at different ultrasonic amplitudes (20% and 30%). Amplitude is one of the most important parameter when reproducing sonication results. An increase in viscosity with clay incorporation, at 20% amplitude, was related to the better dispersion, corroborating differential scanning calorimetry results. The sequential diffractograms confirmed the influence of the clay on resin crosslinking and the curing process. An intercalated structure was observed for samples up to 3 wt.% of clay and an amplitude of 20% during sonication, corroborating the increase in flexural strength and lower values of coefficient of thermal expansion. Modulus increased with the incorporation of clay, whereas impact strength and linear burning rate declined.

Sign in / Sign up

Export Citation Format

Share Document