Two-Step Curing Reaction of Epoxy Resin Studied by Thermal Analysis and Infrared Spectroscopy

Yamasaki, Hideo; Morita, Shigeaki

doi:10.1366/11-06437

Cited by 17 publications

(3 citation statements)

References 45 publications

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“…And the position of broken chemical bonds induced by 1 MeV proton irradiation was studied by FTIR, as shown in figure 8. It was found that two infrared peaks at 912 cm −2 attributed to stretching vibration of oxirane C-O groups [25] and 1032 cm −2 attributed to stretching vibration of aliphatic ether C-O groups [26,27] almost disappeared after high energy proton irradiation. The disappearing of IR peak at 1032 cm −2 can easily be attributed to chain scissions at aliphatic ether C-O groups while the disappearing of IR peak at 912 cm −2 may be due to the crosslinking reactions.…”

Section: Effect Of High Energy Proton Irradiation At High Temperature...mentioning

confidence: 99%

High energy proton irradiation stability and damage mechanism of shape-memory epoxy resin

Hou¹,

Shan³

et al. 2019

Smart Mater. Struct.

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The effects of 1 MeV proton beam irradiation at 70 °C on shape-memory epoxy resin (SMEP) were investigated from the perspective of shape memory properties, dynamic thermomechanical properties and chemical structures in this paper. Results illustrated that the degradation of SMEP's shape recovery rate was staged in contrast to the negligible degradation of shape fixity rate. The shape recovery rate reduced relatively slowly from 98.59% to 91.16% in the initial stage before the fluence reached 5×10 14 cm −2 and then came down sharply to 38.82% after the fluence reached 1×10 15 cm −2 and eventually reduced slowly to 36.29%. Moreover, the degradation of SMEP's dynamic mechanical properties was also staged with the increasing of irradiation fluence. When the fluence was 2×10 14 cm −2 , there was still one peak in the tan δ spectrum shifting to higher temperature, indicating that the network of SMEP was still homogeneous and crosslinking instead of chain scissions took place mainly and homogeneously. When the fluence reached 5×10 14 cm −2 , the network of SMEP turned to be heterogeneous since there were 3 peaks split from one peak, implying that crosslinking and chain scissions coexisted simultaneously and to a similar extent. After the irradiation fluence reached 1×10 15 cm −2 , the two peaks in higher temperature merged into one peak and the intensity of this peak decreased quickly, revealing that chain scissions turned to be prominent. Structural analysis demonstrated that the chain scissions induced by 1 MeV proton irradiation mainly took place at the sites of aliphatic ether C-O groups on the surface layer, which was responsible for the significantly reduced shape recovery rate after the irradiation fluence reached 1×10 15 cm −2 .

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Section: Effect Of High Energy Proton Irradiation At High Temperature...mentioning

confidence: 99%

High energy proton irradiation stability and damage mechanism of shape-memory epoxy resin

Hou¹,

Shan³

et al. 2019

Smart Mater. Struct.

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“…Monitoring methods of adhesive curing mainly include thermogravimetric methods, infrared spectroscopy, dielectric property measurements and X-ray methods; however most of them are ex situ investigations, with certain limitations for evaluating the curing process. [12][13][14][15] Ultrasonic waves have merits of being non-destructive, high penetration, high sensitivity and fast propagation for in situ investigations. 16 The propagation of ultrasonic waves is sensitive to the macroscopic polymer structure as well as the mechanical properties of the material.…”

Section: Introductionmentioning

confidence: 99%

Dynamic monitoring of epoxy reactions and modulus evaluation by a multispectral approach

Liu,

Huang,

Sun

et al. 2023

Mol. Syst. Des. Eng.

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“…15,–17 Yamasaki and Morita revealed complicated chemical reactions during the epoxy curing process using PCMW2D NIR/mid-IR correlation analysis. 18 However, direct hetero-spectral correlation based on the PCMW2D correlation analysis was not reported.…”

Section: Introductionmentioning

confidence: 99%

Moving-Window Two-Dimensional Heterospectral (MW2DHetero) Correlation Analysis and Its Application for the Process Monitoring of Alcoholic Fermentation

et al. 2015

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The technique of moving-window two-dimensional heterospectral (MW2DHetero) correlation spectroscopy is proposed. This computational method is based on the ideas of perturbation-correlation moving-window two-dimensional (PCMW2D) correlation spectroscopy and two-dimensional heterospectral correlation analysis. Not only small spectral variations, but also detailed bands assignments were captured using the analysis. This method was applied to near-infrared (NIR) spectra in the 10 000-4000 cm(-1) region and mid-infrared (mid-IR) spectra in the 5000-1200 cm(-1) region, which were simultaneously detected using a dual-region spectrometer. Near-infrared and mid-IR spectra collected during an alcoholic fermentation process using a solution containing glucose and fructose were reported. Slight time differences for the consumption of sugars compared with the production of ethanol were found between 50 and 150 min. It was concluded that these slight time differences are evidence for different consumption times between glucose and fructose during the fermentation process. The result proved a possibility of the selective monitoring of the simultaneous reaction processes between productive and consumptive components.

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Two-Step Curing Reaction of Epoxy Resin Studied by Thermal Analysis and Infrared Spectroscopy

Cited by 17 publications

References 45 publications

High energy proton irradiation stability and damage mechanism of shape-memory epoxy resin

High energy proton irradiation stability and damage mechanism of shape-memory epoxy resin

Dynamic monitoring of epoxy reactions and modulus evaluation by a multispectral approach

Moving-Window Two-Dimensional Heterospectral (MW2DHetero) Correlation Analysis and Its Application for the Process Monitoring of Alcoholic Fermentation

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