Research On Relational Mechanical Properties Of PA6/SiO₂/PTT Composites

Modifying the present existing basic polymer is a very important way to obtain a new and finer performance polymer, and is one of the most popular fields in the polymer research. Both blending and modifying via inorganic nano-material are all prevalent in the polyamide research. With the development of nano-technology, the nano-composites will used widely as a new and finer performance material.Nowadays, researchers generally place their interests on the preparation, physical and chemical characterization and application of polymer alloys. There are fewer studies relative to mechanical aspects of the materials except for some measurements and comparisons of strength and toughness, and using simple blending principle to estimate the mechanical properties.Combining mechanical theories with polymer material science and physical science, our workgroup has invented a technically innovative method to prepare polymeric nano-composites in-situ, and PA6/SiO₂ nano-composites were synthesized by the method which is ordinary and to obtain nano-SiO₂ and PA6 simultaneity. Base on the interior multi-scale structures that polymeric nano-composites are constructed by, a theoretical model which can describe the interior multi-scale structures of polymeric nano-composites is provided to study the mechanical behaviour of the polymeric nano-composites. Using the structural model, macroscopic effective mechanical properties of typical semi-crystalline polymer such as PA6 has been studied.Enlightened by the above ideas and theories, I started my research. Typical polymeric nano-composites, PA6/SiO₂/PTT, is prepared in the present research. On the base of microcosmic structure of the PA6/SiO₂/PTT composites are observed by SEM , a theoretical model which can describe the multi-scale structural model is constructed, which macroscopic effective elastic modulus of the composites is calculated by. Comparisons of the results with the experimental data indicate that multi-scale structural model is relatively satisfactory for calculating macroscopic effective elastic modulus of the polymer-composites when volume fraction of the...