聚合物光纤老化性能的研究/Study on Aging of Polymer Optical Fiber

2018-05-07 09:12:43

heat aging 老化 POF PMMA



摘 要
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。
首先,在对老化概念分析的基础上,重点讨论了热老化、热氧老化和紫外老化产生的机理和条件,同时对这几种老化的主要影响因素进行了分析,为老化实验参数的选取提供了理论依据。
通过对POF老化机理的分析和材料本身性能的研究,并结合实验室条件,建立了POF老化的实验方法,确定了合理的实验条件。同时结合IEC标准,提出了表征POF老化前后主要性能变化的参数及表征方法,为POF老化特性的实验研究奠定了基础。
实验研究了热老化、热氧老化、紫外老化和冷热循环对POF损耗性能和耐热性能的影响。并从影响损耗和耐热性能的宏观参数如直径的波动、老化失重率、DSC和对PMMA颗粒料样品进行微观结构的GPC分析等方面分析了POF性能产生变化的原因。结果表明:经过老化后,POF损耗变大,耐热性能变差。在热氧老化条件下损耗变化率呈现波浪型变化,而紫外老化随光强增加损耗变大,臭氧含量的大小能明显改变老化效果;经过老化处理后样品的玻璃化转变温度Τg都有不同程度的降低。宏观和微观参数的变化表明:老化并没有破坏POF的宏观几何结构,而除了冷热循环实验外,其它老化条件下材料都有不同程度的失重;热氧老化和热老化没有使PMMA分子主链断链,而紫外老化后部分PMMA分子主链断裂降解。
从POF老化产生的机理和实验研究结果表明:引起老化后POF损耗变大、耐热性能变差的主要原因是材料发生了氧化和光降解作用。

关键词:聚合物光纤,老化,损耗,PMMA
论文类型:应用基础


Abstract
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