摘 要

　　塑膠光纖預型體的製程有共擠壓法、光聚合法、離心聚合法、膨潤凝膠法…等，這些方法均可成功地製造預型體，但所得的預型體不論在長度或是口徑都有相當的限制，無法作為實際的應用，本實驗針對膨潤凝膠聚合法（swollen-gel polymerization）加以改良，成為單體補充膨潤法用以製作大口徑塑膠光纖預型體。實驗利用高折射率非反應型單體 diphenyl sulfide（DS）以及低折射率反應型單體methyl methacrylate（MMA），使用 azobisisobutyronitrile（AIBN）為起始劑，針對膨潤凝膠製程，探討高折射率單體比例、起始劑比例、膨潤時間（t）、膨潤溫度（T）等因素對於預型體光學特性的影響，並找出最佳預型體製造條件為T = 45℃、t = 108 hr、MMA/DS= 4/1、AIBN=0.1wt％。實驗結果顯示單體補充膨潤法可用來製作大口徑GI型塑膠光纖預型體，且得到預型體的光學特性優於使用其他方法所製造的預型體，可使用在影像傳送如：影印機、掃描器等方面，亦可將預型體抽絲成為資料傳遞用光纖，應用在區域網路方面。

Abstract
　　Gradient refractive index (GI) plastic perform could be fabricated using the centrifugal polymerization, photopolymerization, co-extrusion, and swollen gel polymerization process. However, the methods were limited in producing only short and small caliber ones. To fabricate large caliber GI plastic optical perform, a "feeding swollen gel polymerization" process was developed. Diphenyl sulfide (DS) and methyl methacrylate (MMA) were used as the higher and the lower refractive index monomers in the process, respectively. Effects of initiator concentration, feed composition, swelling temperature, and swelling time on the optical properties of the plastic perform were all investigated. The optimal conditions of swelling temperature T= 45oC, swelling time t= 108hr, feed monomer composition MMA/DS= 4/1, and initiator concentration [AIBN] = 0.1wt% were estimated. The novel process of "feeding swollen gel polymerization" was found effective for the fabrication of the large caliber GI plastic rods. Real image transmission through the prepared GI plastic rod was also evaluated. Due to the excellent optical behaviors, the GI plastic rods are expected to have great potential on the fields of scanner, copy machine, and internet systems.

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