呵呵:成功了哦
一定要看啊,大家
没有事情的也学习学习,有事情的抽出时间也学习学习!
摘要
聚合物基复合材料以其优异的性能越来越受到人们的青睐。由于聚合物基复合材料一般是由模量较高的填料和模量较低的基体复合而成，基体与填料相容性一般不好，二者形成的界面性能往往较差，这严重影响了聚合物基复合材料的力学性质。因此，聚合物基复合材料界面性质的研究一直受到各国科学家的重视。人们在研究界面改性时往往加入一些改性剂(如偶联剂、相容剂等)，但是目前可用的界面助剂种类有限，而且人们在选择助剂进行界面改性时往往是纯经验性的，还没有系统的理论和方法作指导。
本文针对上述情况，通过对填料与基体表面性能的研究，提出界面优化的途径，并针对所研究的体系设计合成有效的界面助剂。
首先，研究了粉体填充聚氨醋弹性体复合材料的界面性能。通过表面分析的方法，测出参比液在基体与填料表面的接触角e，计算出其表面张力Ys、表面张力的极性分量丫气、非极性分量Y as.、极性分数P:并由此估算出了基体与填料所形成的界面的界面张力Y sL、粘附功We、裂纹能Yo。用这些参数对界面粘结性能进行了预估;通过力学实验对预估进行了验证。通过对单个填料粒子进行受力分析，认为在受拉力时易发生破坏的是填料的两极点附近，好的界面应能在填料表面形成可变形层，在受力时能吸收变形功，从而提高复合材料的力学性能。对拉伸断面进行了扫描电镜研究。提出了聚合物复合材料界面优化设计的原则，并针对所研究的体系设计合成出了界面助剂，研究了界面助剂的性能，结果表明它们能很好地改善填料表面性能使与基体匹配，经界面助剂处理的复合材料的力学性能得到了提高。证明所合成的界面助剂是有效的界面助剂。
其次，研究了粉体填充环氧树脂复合材料。通过对填料与基体表面性能的研究预估了二者界面粘结性能。对单个填料粒子进行了受力分析。得出对环氧树脂这类脆性材料，不仅要有良好的界面粘结，而且要有可变形的柔性层，这样才有利于应力在界面层的均匀传递，引发银纹，屈服并终止银纹的扩展，才能起到增韧的效果。进行了界面优化设计，估算了所合成的界面助剂的溶度参数，通过与基体树脂溶度参数相比较评价了界面助剂与基体树脂的相容性。冲击实验结果证实，界面助剂能明显增加复合材料的冲击强度。对复合材料冲击断面进行扫描电镜研究，发现经界面助剂处理的界面性能良好。
关键词:界面改性 界面助剂 表面张力 粘附功
STUDY ON THE INTERFACIAL ADHESIVE PROPERTIES
OF PARTICULATE-FILLED POLYMER COMPOSITES
ABSTRACT
Nowadays, more and more attentions have been paid to the polymer composites because of their excellent properties. Polymer composites are formulated of high modulus filler and low modulus polymer matrix. The compatibility and interfacial property between filler and polymer matrix are not well, which affect the mechanical properties of the polymer composites- Therefore, many scientists of the world have paid great attentions to study the interfacial properties of polymer composites. We always add some modifiers, such as coupling agent, solubilizing agent, to the composites when we modify the interfacial properties. But there are limited interfacial additives that we can use nowadays. There are some experienced ways to select the additives when modifying the interface. We have no systematic theories and efficient ways to direct the modification of interfacial properties.
To solve these problem, this article has given a way to modify the interfacial layer by testing the surface properties of filler and polymer matrix. Some workable
interfacial additives have been synthesized.
Firstly, to the particulate filled Polyurethane composites, we have detected the
contact angle between test solvent and filler or polymer matrix by the surface analysis.
The surface tension, polar force parameter of the surface tension, apolar force
parameter of the surface tension and polar fraction had been calculated. From the
parameters, the interfacial tension, work of adhesion, fracture energy between filler and polymer matrix had been estimated. The interfacial adhesion properties had been estimated by means of these parameters and tested by mechanical test. We believed that it is the bipolar area of the filler that are easier fracture points from the force analysis of a single particle .The ideal interfacial layer must have a changeable layer which can absorb the energy by the fracture, the mechanical properties will be improved by the modified layer. We have studied the SEM micrographs of the mechanical fracture surface of polymer composites. Modifying principles to the interfacial layer of polymer composites have been given, some novel interfacial additives have been designed and synthesized .The properties of the additives have been studied. We find that these additives can modify the surface properties of filler and improve the mechanical properties of polymer composites. It is proved that the interfacial additives that we have synthesized are some suffcient additives to the particulate filled Polyurethane elastic system.
Secondly, to the particulate filled Epoxy composites, the interfacial adhesive
properties between them had been estimated. We have found that the brittle material,such as Epoxy, must have excellent interfacial adhesive strength and changeable layer which can transmit stress, induce craze and yield to contract the spread of the craze from force analysis of a single particle. The interfacial modification of the system have been given, the solubility parameters of the additives have been calculated .The compatibility between the matrix and the additives have been estimated. The mechanical test had proved that the additives can improve the mechanical properties of the particulate filled Epoxy composites. The SEM micrographs had been studied and found that the interfacial properties are excellent.
Key words: Polymer Composites Interfacial Modification Interfacial Additive
Surface Tension Work of Adhesion
一定要看啊,大家
没有事情的也学习学习,有事情的抽出时间也学习学习!
摘要
聚合物基复合材料以其优异的性能越来越受到人们的青睐。由于聚合物基复合材料一般是由模量较高的填料和模量较低的基体复合而成，基体与填料相容性一般不好，二者形成的界面性能往往较差，这严重影响了聚合物基复合材料的力学性质。因此，聚合物基复合材料界面性质的研究一直受到各国科学家的重视。人们在研究界面改性时往往加入一些改性剂(如偶联剂、相容剂等)，但是目前可用的界面助剂种类有限，而且人们在选择助剂进行界面改性时往往是纯经验性的，还没有系统的理论和方法作指导。
本文针对上述情况，通过对填料与基体表面性能的研究，提出界面优化的途径，并针对所研究的体系设计合成有效的界面助剂。
首先，研究了粉体填充聚氨醋弹性体复合材料的界面性能。通过表面分析的方法，测出参比液在基体与填料表面的接触角e，计算出其表面张力Ys、表面张力的极性分量丫气、非极性分量Y as.、极性分数P:并由此估算出了基体与填料所形成的界面的界面张力Y sL、粘附功We、裂纹能Yo。用这些参数对界面粘结性能进行了预估;通过力学实验对预估进行了验证。通过对单个填料粒子进行受力分析，认为在受拉力时易发生破坏的是填料的两极点附近，好的界面应能在填料表面形成可变形层，在受力时能吸收变形功，从而提高复合材料的力学性能。对拉伸断面进行了扫描电镜研究。提出了聚合物复合材料界面优化设计的原则，并针对所研究的体系设计合成出了界面助剂，研究了界面助剂的性能，结果表明它们能很好地改善填料表面性能使与基体匹配，经界面助剂处理的复合材料的力学性能得到了提高。证明所合成的界面助剂是有效的界面助剂。
其次，研究了粉体填充环氧树脂复合材料。通过对填料与基体表面性能的研究预估了二者界面粘结性能。对单个填料粒子进行了受力分析。得出对环氧树脂这类脆性材料，不仅要有良好的界面粘结，而且要有可变形的柔性层，这样才有利于应力在界面层的均匀传递，引发银纹，屈服并终止银纹的扩展，才能起到增韧的效果。进行了界面优化设计，估算了所合成的界面助剂的溶度参数，通过与基体树脂溶度参数相比较评价了界面助剂与基体树脂的相容性。冲击实验结果证实，界面助剂能明显增加复合材料的冲击强度。对复合材料冲击断面进行扫描电镜研究，发现经界面助剂处理的界面性能良好。
关键词:界面改性 界面助剂 表面张力 粘附功
STUDY ON THE INTERFACIAL ADHESIVE PROPERTIES
OF PARTICULATE-FILLED POLYMER COMPOSITES
ABSTRACT
Nowadays, more and more attentions have been paid to the polymer composites because of their excellent properties. Polymer composites are formulated of high modulus filler and low modulus polymer matrix. The compatibility and interfacial property between filler and polymer matrix are not well, which affect the mechanical properties of the polymer composites- Therefore, many scientists of the world have paid great attentions to study the interfacial properties of polymer composites. We always add some modifiers, such as coupling agent, solubilizing agent, to the composites when we modify the interfacial properties. But there are limited interfacial additives that we can use nowadays. There are some experienced ways to select the additives when modifying the interface. We have no systematic theories and efficient ways to direct the modification of interfacial properties.
To solve these problem, this article has given a way to modify the interfacial layer by testing the surface properties of filler and polymer matrix. Some workable
interfacial additives have been synthesized.
Firstly, to the particulate filled Polyurethane composites, we have detected the
contact angle between test solvent and filler or polymer matrix by the surface analysis.
The surface tension, polar force parameter of the surface tension, apolar force
parameter of the surface tension and polar fraction had been calculated. From the
parameters, the interfacial tension, work of adhesion, fracture energy between filler and polymer matrix had been estimated. The interfacial adhesion properties had been estimated by means of these parameters and tested by mechanical test. We believed that it is the bipolar area of the filler that are easier fracture points from the force analysis of a single particle .The ideal interfacial layer must have a changeable layer which can absorb the energy by the fracture, the mechanical properties will be improved by the modified layer. We have studied the SEM micrographs of the mechanical fracture surface of polymer composites. Modifying principles to the interfacial layer of polymer composites have been given, some novel interfacial additives have been designed and synthesized .The properties of the additives have been studied. We find that these additives can modify the surface properties of filler and improve the mechanical properties of polymer composites. It is proved that the interfacial additives that we have synthesized are some suffcient additives to the particulate filled Polyurethane elastic system.
Secondly, to the particulate filled Epoxy composites, the interfacial adhesive
properties between them had been estimated. We have found that the brittle material,such as Epoxy, must have excellent interfacial adhesive strength and changeable layer which can transmit stress, induce craze and yield to contract the spread of the craze from force analysis of a single particle. The interfacial modification of the system have been given, the solubility parameters of the additives have been calculated .The compatibility between the matrix and the additives have been estimated. The mechanical test had proved that the additives can improve the mechanical properties of the particulate filled Epoxy composites. The SEM micrographs had been studied and found that the interfacial properties are excellent.
Key words: Polymer Composites Interfacial Modification Interfacial Additive
Surface Tension Work of Adhesion
