纤维素晶须/羧基丁腈橡胶的固体核磁研究
关键词 固体核磁 横向弛豫 分子运动 GFS模型 21577
毕业论文设计说明书（论文）外文摘要
Title Solid-state NMR investigation of cellulose whiskers/ carboxylated nitrile rubber
Abstract
In this paper, the microscopic molecular motion of BCW/XNBR nanocomposites was characterized by the high resolution solid state nuclear magnetic resonance techniques，while the relationship between it and macroscopic mechanical properties was discussed. The 1H spectrum and its relaxation spectrum of vulcanized rubber were measured and analyzed combining with the GFS model, the results were showed that: with the increasing of BCW content, the full line-width at half height of 1H spectrum signal peak increased and then decreased, the value of 1H transverse relaxation time T2 decreased and then increased， the molecular motion of XNBR chain was reinforced after the first weakened. The combination of macroscopic mechanical properties was found that with BCW content increasing, the filler-polymer interaction gradually increased, so that the mechanical properties of the vulcanized rubber also gradually increased.
Keywords solid state NMR transverse relaxation molecular motion GFS model
目 录
1 绪论 1
1.1 课题背景 1
1.2 细菌纤文素晶须 1
1.3 固体核磁共振 2
1.4 本论文的研究思路 7
2 实验部分 8
2.1 原料 8
2.2 实验配方 8
2.3 实验设备及测试仪器 8
2.4 BCW/XNBR硫化胶制备 9
2.5 表征方法 9
3 结果与讨论 11
3.1 BCW对硫化胶1H NMR谱图的影响 11
3.2 BCW对硫化胶不同链段分子运动的影响 13
3.3 链段分子运动与宏观力学性能的相关性 17
4 实验结论 18
结 论 19
致 谢 20
参考文献 21
附 录 24
1 绪论
1.1 课题背景
众所周知，天然高分子材料—纤文素具有生物可降解性，广泛存在于自然界中，在当今资源匮乏的情况下，大力开发纤文素的应用，具有重要的战略意义。经微生物合成的纤文素在纯度及其它性能方面均明显优于传统的植物纤文素，是一种对环境友好的新型材料。而将其应用于纳米复合材料的制备中，改善基体的各项性能，是当今国内外研究的热点之一。
随着理论的成熟和谱仪技术的不断发展，固体高分辨核磁共振技术已经成为当今高分子材料研究领域必不可少的研究手段。它不仅可表征高分子的微观结构，而且可研究其微观分子运动，对高分子材料学的发展起着重大的推动作用[1]。
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