| The confined morphology and structure of PA6/SEBS was studied, In situ FTIR was used to analysis the wavenumber variation of amide group by changing the concentration of CaC12 and temperature. As the normal test methods have shortage on determmg the mechanism, the process of PA6/CaC12 complex was simulated by means of molecular simulation, the FTIR of computer simulation and experiment was studied, and the results show that they have the same regularity. SEBS was used to tough PA6/CaC12 complex, the influence of phase structure, mechanical property, thermal behavior and rheological property by interface interaction was studied. From the above research we made the conclusion that:1. Mechanics properties of PA6/CaC12 complex show that the stress module increases, the stress intensity can above lOMpa than the pure PA6, but the impact strength decrease. The viscosity of PA6/CaC12 complex increase as the concentration of CaCl2 increase. The heat decomposition temperature decrease less than 10癈 when the concentration of CaC12 not more than 3%.2. FTIR and WAXR results show that adding CaC12 can dramatic increase the glass transition temperature of PA6, decrease the crystal temperature and melt temperature, the crystallinity of PA6 can be controlled continually, the complex can be changed from non-transparent to transparent.3. In situ FTIR results show that N-H and C=O IR absorption peak gradually change to low wavenumber and C-N IR absorption peak gradually change to high wavenumber by increasing the concentration of CaC12. N-H and C=O IR absorptionpeak have some alteration by increasing the temperature, but C=O IR absorption peak has little alteration in the whole temperature range, these indicate that N and O have different reaction to CaC12.4. Computer simulation was adopted, the reaction mechanism was calculated by molecular mechanics method and molecular dynamics method, we made the result that the total energy of Ca-N complex is minimum, it indicate that the complex reaction between Ca and N is the most stable, the alteration trend of N-H, C=O and C-N is the same to experiment, and we can affirm the reaction mechanism.5. FTIR analysis of PA6/SEBS blends shows that the more interface between PA6 and SEBS, the more MAH was consumed, it proof that N-H of PA6 can react to MAH, so the interface interaction is increase.6. Rheological property analysis of PA6/SEBS blends and PA6/SEBS-g-MAH blends show that PA6 and SEBS are the inconsistent material, and the high viscosity material controls the viscosity, low concentration of SEBS can decrease the viscosity of blends. The viscosity of PA6/SEBS-g-MAH blends monotone increase as the concentration of SEBS-g-MAH increase, this also indicate that PA6 and SEBS-g-MAH has stronger interface interaction. The viscosity of PA6/SEBS/SEBS-g-MAH blends represent both influence of SEBS and SEBS-g-MAH, but SEBS-g-MAH has more contribution to the blends.7. DSC results show that in PA6/SEBS blends PA6 has two or three crystal peakat the phase transition range, this indicate that PA6 and SEBS didn't blend perfect, and PA6 has different particle size. PA6 and SEBS-g-MAH has stronger interface interaction, they can blend uniformly, the phase transition can be generated at small range.8. Using SEBS to tough PA6 can get perfect result, when the total amount of SEBS is about 20%, and the rate of SEBS and SEBS-g-MAH is about 4, the super toughed PA6 can be gained, the impact strength can be more than 900kJ/m2.9. PA6/SEBS/CaC12 blends was made, the results show that when the amount of CaC12 is about 3%, the break elongation of blends increase to more than 300%, much-5-higher than pure PA6 and PA6/SEBS blends in the same mixture rate. Further study shows that CaC12 has main effect to increase break elongation, and SEBS acts as preventing PA6 break prematurely.10. The stress intensification of PA6/CaCl2 is means of complexation between N and CaCl2, the toughness of PA6/SEBS-g-MAH blends is by means of reaction between N-H and MAH, they... |
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