聚合物光纤老化性能的研究/Study on Aging of Polymer Optical Fiber
近年来，随着高速率、大容量数据通信系统及汽车控制系统等的迅速发展，聚合物光纤（Polymer Optical Fiber，简称POF）以其大尺寸、连接方便等优点已经在国际上引起极大的关注。POF在实际制造和使用时经常会受到环境条件如热、氧、紫外光等因素的作用而发生老化，使其性能下降，研究POF的老化过程和变化规律能够有效地预防和控制老化现象的发生，使其在实际中取得更广泛的应用。本文在西安交通大学行动计划“海量信息技术”子课题“低损耗宽频带高聚物光纤的研制”和四川汇源光通信公司的支持下，研究了POF老化产生的机理，老化方案的选取、特性参数的测量和表征以及老化变化规律等问题。
Recently, with the high speed, high volume data transmission network and automobile control system, polymer optical fiber (POF), due to its merits as large size, easy disposal, has gainned an increasing attention all over the world. POF would aging under environment conditions such as heat, oxygen and ultraviolet, etc, when it is being used and produced, which will cause its performance decrease. The study of aging procedure and loss changing rules of POF can effectively protect and control existence of aging. Moreover, it will get more expansive application in practice.Based on item of Xi’an Jiaotong University action project “Magnanimity information technology” (Manufacture of low loss POF) and the support of Sichuan Huiyuan Optical Communication Co.Ltd, this paper primary discuss the key technique issues as follows: the aging mechanisms of POF, the scheme of aging experiment, the measure and token of characteristic parameters and the changes of characteristic parameters during the aging process.
Firstly, the mechanisms and condition of thermal oxidizion aging, heat aging and ultraviolet aging were discussed on the basis of the aging conception. Meanwhile, the main factors affected on these aging types were also analyzed. All of which could provide theoretic foundation on choosing the experimentation parameters of aging.
The experimental scheme of POF’s aging was established according to the analysis of aging mechanism on POF and the material performance itself, as well as laboratory condition. At the same time, based on the criteria of IEC, the main characteristic parameters and token means on aging was brought forward. It would available to the experimental study of POF’s aging.
The influence of thermal oxidizion aging, heat aging, ultraviolet aging and thermal circle aging upon attenuation and heat-resistant performance of POF were studied. Moreover, the resons that the attenuation and heat-resistant performance of POF changed were analysed by the macroscopical factors such as diameter undulation, weight loss and the change of molecule weight of PMMA granule.The results showed that the attenuation increases and the heat-resistant decreases after aging.With aging time increasing, POF’s attenuation changing rate trend to waves under the condition of thermal oxidizion aging, the more ultraviolet intensity the more attenuation increases, the attenuation changes with different content of ozone; the glass transition temperature Τg of the sample decresed in some extent after aging process. The results showed that the structure of the POF was not destroyed by the aging experiment; the materials have weight loss in a certain extent under other conditions except the thermal circle experiment; the main chains of PMMA molecule were not broken by thermo oxidizing aging and heat aging，however，the main chains of PMMA molecule might be broken partially by irradiation of ultraviolet.
The results obtained from the mechanism of aging and experimental study of POF indicated that the main reason that the attenuation increases and heat-resistant decreases after POF’s aging was that the material of POF was oxidated and decomposed.
Key words: polymer optical fiber, aging, loss, PMMA
Type of Thesis: Application foundation