Simultaneous measurement of depth-resolved refractive index field and deformation field inside polymers during the curing process

Huang, Pinbo; Lin, Yuankun; Bai, Yulei; Zhang, Ni; Xie, Shengli; Dong, Bo

doi:10.1016/j.measurement.2022.112184

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…The final product differs from the initial one in such physical properties as density, hardness, refractive index (RI), and others. It is known from optical measurements that the curing process is accompanied by a continuous increase in refractive index [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Curing Process of Epoxy Resin by Long-Period Fiber Gratings

Ivanov,

Bhavsar,

Morgan-Clague

et al. 2024

Sensors

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The curing of epoxy resin is a complex thermo-chemical process that is difficult to monitor using existing sensing systems. We monitored the curing process of an epoxy resin by using long-period fiber gratings. The refractive index of the epoxy resin increases during the curing process and can be measured to determine the degree of curing. We employed long-period fiber gratings that are sensitive to the refractive index of an external medium for the measurement of refractive index changes in the resin. We observed that the resonances of long-period fiber gratings increased their depth with the increased refractive index of the resin, which was well described by our simulation taking the coupling to radiation modes into account. We demonstrated that the degree of cure can be estimated from the depth of the grating resonances using a phenomenological model. At the same time, long-period fiber gratings are sensitive to temperature variations and internal strains that are induced during curing. These factors may affect the measurements of curing degree and should also be addressed.

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Section: Introductionmentioning

confidence: 99%

Monitoring of Curing Process of Epoxy Resin by Long-Period Fiber Gratings

Ivanov,

Bhavsar,

Morgan-Clague

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

“…Many experimental techniques are used to monitor resin cure kinetics including changes in refractive index, [8][9][10] rheology, 11,12 and dielectric analysis [13][14][15] although differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy are perhaps the most widely implemented. DSC exposes a sample to a thermal profile and measures the heat flow during the curing process.…”

Section: Introductionmentioning

confidence: 99%