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Design and synthesis of graded index plastic optical fibers by copolymeric system

机译：共聚体系设计合成渐变折射率塑料光纤

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Graded index plastic optical fibers (GI POF) based on the copolymer of 2,3,5,6-tetrafluorophenyl methacrylate (TFPMA) and methyl methacrylate (MMA) were prepared. The copolymers of 10 wt% and 20 wt% of TFPMA with MMA were prepared in bulk using di-tert-butyl peroxide as the radical initiator at 90-120℃ for 48 hr. The glass transition temperatures (T{sub}g) of the copolymers were 115 and 118℃, and the refractive indexes were 1.4912 and 1.4901 at 589 nm, respectively. The transmittances of the copolymers were a slightly higher than that of pure PMMA. Copolymer tubes (diameter 18 mm, length 600 mm) were prepared by the copolymerization of TFPMA (10 and 20 wt%) with MMA (90 and 80 wt%) as the cladding of the optical fiber. In order to prepare GI POF based on these copolymers, a high refractive index compound, diphenyl sulfide (DPS) ((n{sub}D){sup}20 = 1:6330), was added to the mixture of the monomers in the tube (as a core material) and then copolymerized by an interfacial gel polymerization technique. The material dispersion and optimum index exponent g were calculated and found to be very close to that of GI POF prepared from pure PMMA. The obtained copolymer preforms were drawn by heating at 220-250℃ with controlling of drawing velocity. The resulting fiber diameter was 0.75 mm and the length was 50-150 m. The attenuation spectra of the fibers were measured and found to be similar to GI POF prepared using pure PMMA. The results indicate that the core material of GI POF can be prepared by a copolymer system in which the refractive indexes of homopolymers are very close to each other and the monomers yield a random copolymer.
机译：制备了基于甲基丙烯酸2,3,5,6-四氟苯基酯（TFPMA）和甲基丙烯酸甲酯（MMA）的共聚物的渐变折射率塑料光纤（GI POF）。使用过氧化二叔丁基作为自由基引发剂，在90-120℃下反应48小时，制备了10％（重量）和20％（重量）的TFPMA与MMA的共聚物。共聚物的玻璃化转变温度（T {sub} g）为115和118℃，在589nm处的折射率分别为1.4912和1.4901。共聚物的透射率略高于纯PMMA。通过使TFPMA（10和20wt％）与作为光纤包层的MMA（90和80wt％）共聚制备共聚物管（直径18mm，长度600mm）。为了基于这些共聚物制备GI POF，将高折射率化合物二苯硫醚（DPS）（（n {sub} D）{sup} 20 = 1：6330）添加到管（作为芯材料），然后通过界面凝胶聚合技术进行共聚。计算了材料分散度和最佳指数g，发现它们与由纯PMMA制备的GI POF非常接近。在控制拉伸速度的情况下，通过在220-250℃下加热，将所得的共聚物预成型坯拉伸。所得纤维直径为0.75mm，长度为50-150m。测量纤维的衰减光谱，发现其与使用纯PMMA制备的GI POF相似。结果表明，可以通过共聚物体系制备GI POF的芯材，其中均聚物的折射率彼此非常接近，并且单体产生无规共聚物。

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