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Official thesis title: Studies and preparations of composite materials containing piezoelectric nanoparticles and investigation the change of thermal-mechanical properties of composite materials in the tropical environments.
1. Full name: PHAN THI TUYET MAI
2. Sex: Female
3. Date of birth: 19/4/1982
4. Place of birth: NINH BINH
5. Admission decision number: 671/QĐ-SĐH, date 15/5/2009, Vietnam National University Hanoi.
6. Changes in academic process: None
7. Official thesis title: Studies and preparations of composite materials containing piezoelectric nanoparticles and investigation the change of thermal-mechanical properties of composite materials in the tropical environments.
8. Major: Theoretical and Physical Chemistry
9. Code: 62 44 31 01
10. Supervisors: PGS.TSKH. Luu Van Boi; TS. Nguyen Xuan Hoan
11. Summary of the new findings of the thesis
1. The optimal condition to preparation the epoxy matrix obtained conversion >99% are the ratio of DDM/DGEBA r = 1.1; cycle curing following as three steps: 500C/30min, 1100C/30min, 1800C/3h;
2. Polyme composites based on epoxy resin containing γ-APS grafted and ungrafted BaTiO3 nanoparticles have been prepared and characterized. The results show that, the first, thermal-mechanical properties and dielectric of obtained polyme composite is maximum at 5% weight of BaTiO3; the second, the diffusion and and linkage forming ability of γ-APS treated BaTiO3 in epoxy matrix are better than those untreated, lead to increase the dielectric constant and strength of materials.
3. Polymer composites based on epoxy resin reinforced by γ-APS–modified and unmodified glass fiber have been developed and characterized. The results show that the mechanical property of the γ-APS modified glass fiber composites are better than those unmodified; the optimal volume content of γ-APS grafted glass fiber is 45% of the total sample;
5. Polymer composites based on epoxy resin reinforced by BaTiO3 deposited glass fiber have been prepared and characterized. The results show that the mechanical properties, thermal-mechanical properties and dielectric constant of the γ-APS modified BaTiO3 deposited glass fiber composites are better than those undeposited; the optimal volume content of BaTiO3 deposited glass fiber is 47 % of total sample;
6. Combining dielectric constant measurement and FT-IR spectroscopy have been developed the new method for monitoring the microstructure of polymer composites; the structural parameters of composite material appeared during the degradation process in different exposure environments are more successfully detected.
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