摘要：通过力学性能测试，熔融指数测定，示差量热扫描（DSC），偏光显微镜和 X¬ 射线衍射（XRD），研究在复合成核剂（PA-6，弹性体POE，EAA-Mg，滑石粉等）中，究竟哪一因素对POM增韧或成核起主导作用，并探索最佳添加量。在复合成核剂各组分中，分别研究PA6，聚乙烯蜡-Mg（EAA-Mg），POE对POM成核和增韧的影响。结果证明：少量EAA-Mg和POE都对POM改性影响不大。当POM/PA6=7/3作为母粒共混加入POM，改变PA6的添加量（0.15-0.9%），结果表明PA6能有效增韧改性POM。当其添加量为0.3%，改性效果最佳：比纯POM断裂伸长率增长21.56%，拉伸强度提高2.3MPa，缺口冲击强度提高1.70KJ/m2。综合得出结论：在复合成核剂中，PA6是起决定性因素的改性剂，POM/PA6=7/3作为母粒，PA6添加量为0.3%时，改性效果最佳。24184
毕业论文关键词： 聚甲醛；复合成核剂；离聚体；增韧改性；力学性能
The research on the modification of POM with Ethylene-octene copolymer/ethylene-acrylic copolymer-Mg composite
Abstract:Composite nucleating agent can comprehensively toughen and modify POM. mechanical tests, melt index, differential volume thermal scanning (DSC)and X ray diffraction (XRD) which factor plays a leading role in the nucleation and explore the best amount. Among the nucleating agent in the composite of the components, we investigated respectively PA6, polyethylene wax -Mg (EAA-Mg), POE nucleation. The results prove that: a small amount of EAA-Mg and POE both showed only little effect on the mechanical properties of POM, declined slightly. Eventually, the fixed POM/PA6 = 7/3 ratio of blending join the POM, changing the amount of PA6 (0.15-0.9 %), the experimental results showed that the PA6 toughening of POM effectively. And when it is added in an amount of 0.3%, POM has the best modification. POM has the better growth rate of net elongation of 21.56%, the tensile strength increased 2.3MPa, notched impact strength increased 1.70KJ/m2. Accordingly, the consolidated conclusion:Among the composite nucleating agents, PA6 is a decisive factor of modifying POM. With fixing the POM/PA6 ratio fixed as 7/ 3, when the addition amount of PA6 is 0.3%, the effect of modifying POM is best.
KeyWords: Polyoxymehylene；Ionomer；nucleator；Toughening；Mechanical properties
目 录
1 前言    1
1.1 聚甲醛POM的性能概述    1
1.1.1 聚甲醛的增韧机理    2
1.1.2 聚甲醛增韧改性方法的研究    3
1.1.3 改性聚甲醛POM成核剂国内外研究现状    4
1.2研究目的和意义    5
1.2.1 研究目的    5
1.2.2 研究意义    5
1.3 研究内容与研究方法    5
1.3.1 研究内容    5
1.3.2 研究方法    6
2 实验部分    6
2.1 成核剂/增韧剂的制备及加工条件    7
2.1.1 接枝前后POE对聚甲醛增韧改性    7
2.1.2聚乙烯蜡-Mg对聚甲醛增韧改性    8
2.1.3 PA6对聚甲醛的成核改性    9
2.1.4 复合成核剂对聚甲醛的成核改性    9
2.2 成核剂/增韧剂对聚甲醛力学性能与结晶行为的表征    9
2.2.1 力学性能    9
2.2.2 示差量热扫描（DSC）    10
2.2.3 偏光显微镜    10
2.2.4 X-射线衍射（XRD）    10
3 结果与讨论    10
3.1 接枝前后POE对聚甲醛增韧改性    10
3.1.1 接枝前POE增韧聚甲醛    10
3.1.2 接枝后POE增韧聚甲醛    12
3.2 聚乙烯蜡-MG对聚甲醛增韧改性    13
3.3 PA6对聚甲醛的成核改性    15 EAA-Mg/POE/PA6对聚甲醛增韧与成核改性的研究:http://www.751com.cn/huaxue/lunwen_17573.html