Optimization of microstructured polymer optical fibersdrawing
Başlık çevirisi mevcut değil.
- Tez No: 716641
- Danışmanlar: PROF. DR. BARBARA GAWDZİK, DR. PAWEł MERGO
- Tez Türü: Doktora
- Konular: Bilim ve Teknoloji, Biyoteknoloji, Science and Technology, Biotechnology
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2017
- Dil: İngilizce
- Üniversite: Maria Curie Sklodowska University in Lublin
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 97
Özet
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Özet (Çeviri)
The thesis was aimed investigating the parameters in the process of polymer optical fiber fabrication from monomer to fiber. The influence of CTA on molecular weight, optical transmission, refractive index and scattering, effect of the drawing conditions on mechanical and optical properties of polymer fiber were studied. Compared to the commercial PMMA for drawing optical fiber, IPA is not a suitable CTA due to higher molecular weight of polymer samples. n-BMC and PMDS can be used as a CTA in order to prepare polymer in the proper molecular weight range. According to scattering results the polymer samples synthesized by n-BMC exhibit higher scattering than that of IPA and PMDS, due to the S-C bonds which cause significant scattering increase. The transmission results indicate that there is no evident effect of CTA concentration on transmission. The refractive index of PMMA samples was increased by increasing the molecular weight of CTA. After optimization of the polymerization process of PMMA with PMDS, the transmission was increased according to the reference PMMA bulk sample which was synthesized by thioglycolic acid. The fluctuation of PMMA mPOF was decreased below 3% which was the main purpose of this study by drawing process optimization in our laboratory. Different parameters which play a key role in the drawing process were individually optimized in order to decrease the fiber fluctuation. Different diameters of the fiber were used with different drawing speeds and for each drawing speeds, different drawing tension was applied. According to Equation (6), the diameter of the fiber is connected with the feeding speed, the diameter of preform and the drawing speed. The optimal feeding speed of preform was found to be 6 mm/min (300± 25.49 µm) for the 10 mm diameter of PMMA preform. The 10 mm diameter of preform has lower fluctuation than that of 20 mm. Nevertheless, for typical drawing of mPOF 20 mm of diameter of preform is needed due to cladding of the 79 structured preform. Therefore in PMMA mPOF fabrication 20 mm of structured PMMA preform was employed. The fluctuation of homogeneous PMMA fiber was decreased considerably using argon flow. The deviation of fiber diameter was reduced to 2.93% (300±8.78 µm) using 50 L/h argon flow. However, when argon flow decreased to 0L/h or increased to 100L/h or more, the fluctuations increased. After all optimizations, PMMA mPOF was produce under the optimal conditions and different drawing tensions. The deviation of fiber diameter was decreased from 8.5% (300± 25.49 µm) to 2.2% (250±5.56 µm). The homogeneity of the fiber diameter was also confirmed with the Young's modulus. The minimum drawing tension (0.2N) showed the lower deviation (3.435 ± 0.052 GPa). It was shown that the drawing conditions have effect on the mechanical properties of the fiber. The drawing tension is in direct proportion to strain susceptibility and Young's modulus. As the Young's modulus is decreased, the elasticity of the fiber increases due to alignment of the polymer chains in the preform structure. Conversely, when the drawing tension is decreased, the stress susceptibility increases. The result of long-term study shows that the homogeneous PMMA rod fiber loses the elasticity in time under room conditions. Decreases of stress with time due to molecular relaxation processes cause decrease of elasticity. According to the results, it can be considered that it was achieved the project's purpose by decreasing the diameter fluctuation to 2.2% and increasing the mechanical properties of the optical fiber. The results of this study show that the fabrication process of optical fibers affects their mechanical and optical properties. Therefore optimization of the drawing process is aimed at fabricating fiber with better mechanical and photosusceptibility qualities.
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