【作者】 高波；

【导师】 仝毅；

【作者基本信息】 北京理工大学 ， 兵器科学与技术， 2015， 硕士

【摘要】 聚碳酸酯复合树脂是一种分子结构特殊，综合性能优良的热塑性工程树脂，在防护材料领域有着重要的应用。聚合物的高性能与多功能化是近年来高分子材料理论与应用领域研究热点，纳米粒子在聚合物中的填充改性对于开发新型复合材料具有十分重要的意义。本文为研究金刚石微粉（DP）用作填料对聚合物材料力学性能的影响，先对金刚石微粉进行了表面改性，采用熔融共混法成功制备了金刚石微粉－聚碳酸酯（PC）的复合材料，初步探索了该材料与PC树脂共混后的力学性能。（1）以硅烷偶联剂3-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)对金刚石微粉的表面进行有机改性，通过对改性金刚石微粉的红外光谱（FTIR）及粒度测试分析表明，改性剂接枝到了填料表面；由扫描电镜（SEM）所得的图片观察发现，金刚石微粉的软团聚在一定程度上被打开。（2）通过熔融共混法，将KH-570接枝改性的金刚石微粉与PC复合，制得了PC/金刚石微粉纳米复合材料，并考查了其准静态力学、动态力学等性能。在对准静态力学性能考察时发现，粉体加入能不同程度的提高树脂的冲击强度，弯曲强度和模量，以及拉伸强度和模量。（3）霍普金森杆实验发现，金刚石微粉增强复合材料在动态载荷下具有明显的非线性特征和应变率强化效应，聚碳酸酯试样在准静态加载时，应力应变曲线表现出线黏弹性性质，动态载荷下的压缩强度比准静态载荷有较大幅度的提高。由弯曲样条断裂面的SEM可看出,改性后纳米粉体均匀地分散在PC基体中,具有较好的界面相容性,能够起到增强增韧的作用。更多还原

【Abstract】 Polycarbonate composite resin is a kind of thermoplastic engineering plastics withspecial molecular structure and excellent comprehensive performance, which has importantapplication in the field of protective material.In recent years, the multi-functionalization and high performance of polymer has beenthe hot field of polymer materials research and application.The filling nanoparticles inpolymer of great significance in terms of developing the new type of composite materials.To investigate the effect of diamond power(DP) as a filler on polymer materialmechanical properties, composites were synthesized with melt blending method bypolycarbonate and diamond powder, the PC/DP composite mechanical properties and otherproperties were primarily explored.(1)The surface organic modification of diamond power was studied on the followingmethod: silane coupling agent3-(trimethoxydilyl) propylmethacrylate (KH-570)graftingmodification. The modified diamond powder was tested by FT-IR and particle size testerwhich indicated that modifier was grafted to the filler surface while photos from SEM testsmanifested the soft aggregate was opened to a certain degree.(2)The PC/DP nanocomposites were prepared via melting blending.At the same time,their properties of quasi-static mechanics, dynamic mechanics were examined. Resultsshowed that the fill of nanoparticles was able to increase the bending strength and modulus,as well as stretching strength and modulus. Hopkinson bar experiment found that thediamond powder reinforced composites under the dynamic load has obvious nonlinearcharacteristics and strengthening effect of strain rate. Under quasi static loading, the stressstrain curve showed qualification viscoelasticity properties. Compression strength underdynamic loads was greatly improved than the quasi static load. SEM tests showed thatmodified diamond powder was evenly dispersed in the PC substrate, and gained a goodinterface compatibility, as well as the effect of enhanced toughening.更多还原