论文中文题名: | 二茂铁-PVC 接枝物的制备及其性能研究 |
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学号: | 201205168 |
保密级别: | 秘密 |
学生类型: | 硕士 |
学位年度: | 2015 |
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第一导师姓名: | |
论文外文题名: | Research on the Preparation and Performance of Ferrocene- Grafting- PVC Material |
论文中文关键词: | |
论文外文关键词: | Ferrocene ; Polyvinyl Chloride (PVC) ; Modify ; Grafted Blend |
论文中文摘要: |
本论文首次利用 Friedel-Crafts(傅-克)反应实现了二茂铁(Fc)对聚氯乙烯(PVC)的接枝改性,分别通过溶液反应和熔融共混的方法得到了二茂铁接枝 PVC(PVC-Fc)共混物。系统研究了各种因素对溶液反应的影响和共混物材料的影响,明显的改善了PVC 的热稳定性和共混物的力学性能。本论文主要开展了以下工作:
在四氢呋喃和环己酮等溶液体系中成功制备了 PVC-Fc 接枝共聚物,考察了加热方式、溶剂、反应温度、催化剂种类、催化剂用量、反应时间、反应物配比等对反应接枝率的影响,并对接枝共聚物结构与性能进行了表征。结果表明,油浴加热和微波辐照均能实现 Fc 和 PVC 的傅-克反应,但微波辐照效率更高,反应的优化条件是:溶剂环己酮,温度 100 ℃,时间为 20 min,AlCl3、FeCl3、ZnCl2 皆对 Fc、PVC 之间的傅-克反应有催化活性,其中 AlCl3 效果最好,用量为质量分数 3 %,PVC/Fc 配比为 10/8,最大接枝率为 4.52 %。循环伏安参数峰电位之差为 ΔEp=173 mV,峰电流密度之比为ipa/ipc=0.57,证明 PVC-Fc 具有氧化还原性;热重分析表明 PVC-Fc 相对纯 PVC 起始失重温度提高了4.4 ℃,最大失重速率温度提高了15.19 ℃,刚果红试验热稳定时间比PVC 的300 s 提高了849 s。
通过熔融共混方法制备了 PVC/Fc 接枝共混物。研究了二茂铁含量、有无 AlCl3、AlCl3 含量对材料力学性能的影响,结果表明,随着二茂铁、AlCl3 含量的增加,PVC/Fc 接枝共混物的力学性能均呈现先增加后降低的趋势,均比对照样有明显提高,且具有良好的热稳定性,在二茂铁、AlCl3 用量分别为质量分数 20 %、5 % 时,材料的综合性能达到最佳,拉伸强度达到 51.03 MPa,比不含 AlCl3 的共混体系提高了0.3倍,断裂伸长率达到 28.01 %,比不含 AlCl3 的共混体系提高了 1.2 倍。
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论文外文摘要: |
In this paper, we used the Friedel-Crafts (F-C) reaction as the main principle, firstly introduced ferrocene (Fc) to grafting modification of polyvinyl chloride (PVC), produced PVC- Fc by the method of solution and melt blending respectively. We studied the effects of various factors on solution reaction and blends systematically, explored the thermal stability and mechanical properties of PVC/Fc blends are significantly improved. This thesis mainly proceeded to do the following work:
PVC-Fc was prepared in tetrahydrofuran and cyclohexanone solvent. Effects of heating, solution, reaction temperature, type and dosage of catalyst, reaction time, reactant ratio on the grafting rate were investigated, the structure and performance of the grafting products were characterized. The results showed that, compared with the conventional heating method, oil-bath heating and microwave heating both can achieve Friedel-Crafts reaction of PVC/Fc, but the latter was much more efficiency. The optimization of reaction conditions were: the best solvent was cyclohexanone, the optimum temperature was 100 ℃, the optimum time was 20 min. AlCl3, FeCl3, ZnCl2 all had catalytic activity on the Friedel-Crafts reaction of PVC/Fc, and AlCl3 was the best, which optimum mass fraction was 3%. The optimum ratio of PVC and Ferrocene was 10: 8. The highest rate of grafting reaction was 4.52%. The peak potential difference of cyclic voltammograms parameters was ΔEp=173 mV, the ratio of peak current density was ipa/ipc=0.57, which had proved PVC-Fc had obvious redox properties. The initial weightlessness temperature increased 4.4℃ and the temperature of maximum weight loss rate increased 15.19 ℃ than pure PVC by thermogravimetric Analysis(TGA). The time of Congo Red test of PVC-Fc was 849 s higher than PVC`s 300 s.
PVC-Fc grafting blends were prepared by melt blending. We studied the effect of ferrocene content, with or without AlCl3, AlCl3 content on the mechanical properties of the blends. Results indicate that, with the increase of ferrocene content and AlCl3 content, the mechanical properties of the blends increased before the first reduce trends, which were better compare with blank sample. The thermal stability of the blends were better after grafting modification. When the ferrocene content was 20%, the AlCl3 content was 5%, the comprehensive performance of the blends achieved the best, the maximum tensile strength was 51.03 MPa, increased 0.3 times than 39.9 MPa without AlCl3; the elongation at break was 28.01%, increased 1.2 times compare with 12.45% excluding AlCl3.
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中图分类号: | TQ325.3 |
开放日期: | 2015-06-17 |