摘要本课题原料采用聚丙烯腈原丝，考察其在不同氧化条件下的纤维的组成与结构，并通过其介电常数、磁导率以及反射损耗等电磁参数表征，来对比和分析不同预氧化程度的聚丙烯腈预氧化丝的吸波性能，得到以下结论：78843

(一)由XRD测试得到，随着AI增大，预氧化丝的d002、Lc、La先增后减；由红外分析得到，随着AI增大，氢基吸收峰减弱并向低波数移动，逐渐出现芳环C≡C-H、C=O等吸收峰。

(二)当厚度一定时，随着AI增大，预氧化丝吸波能力先减后增，当厚度为2。0mm时，第3组预氧化丝的反射损耗绝对值最大；三组预氧化丝的磁导率μ′相差较小，μ″＞0，随着AI增大，预氧化丝的μ′逐渐提高，ε′先增后减，ε″逐渐提高，因此，由于第3组的磁导率和介电常数更加接近，AI越小时，预氧化丝的磁导率和介电常数匹配度越高。

毕业论文关键词：聚丙烯腈纤维；氧化条件；预氧化；吸波性能；电磁参数

Abstract The raw materials of polyacrylonitrile were used to study the composition and structure of the fibers under different oxidation conditions。 The parameters such as dielectric constant, magnetic permeability and reflection loss were used to characterize and analyze different microwave absorbing properties of polyacrylonitrile pre-oxidation filament。 The conclusions are as follows: 

(1) By XRD test, with the increase of AI, pre-oxidation of the d002, Lc and La increase first and then decrease; by infrared analysis, with AI increases, hydrogen absorption peak weaken, gradually aromatic ring C≡CH, C = O and other absorption peaks appear。

(2) When the thickness is constant, with the increase of AI, microwave absorbing ability of the pre-oxidation wire reduce first and increase, and when the thickness is 2。0mm, the absolute value of the reflection loss of the 3rd group of pre-oxidation silk is the largest; 

The permeability of the three groups of pre-oxidized wire is small, and μ "> 0。 As the AI increases, the μ 'of the pre-oxidized yarn increases gradually as well as ε' increases first and then decreases, and ε is gradually increased。 Thus, the permeability and dielectric constant of the third group are closer。 When AI is smaller, the higher the μ and ε are matching of the pre-oxidation yarn。

KeyWords：polyacrylonitrile fiber；oxidation conditions；pre-oxidation；absorbing properties； electromagnetic parameters

目  录

摘    要 1

Abstract 2

目  录 3

1 绪论 5

1。1 课题研究背景及意义 5

1。2 碳纤维在吸波材料中的应用 5

1。3 聚丙烯腈基碳纤维的简介 6

1。4 聚丙烯腈基氧化纤维的影响因素 7

1。5 聚丙烯腈基氧化纤维的吸波性能 8

1。6 电磁参数对材料吸波性能的影响 10

1。7 国内外聚丙烯腈基碳纤维的研究现状与发展趋势 11

1。8 本课题的研究内容和研究目的 12

2 实验材料、实验方法和实验原理 13

2。1 实验原料 13

2。2 实验设备 13

2。3 热重分析 13