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Preparation and Properties of Thermal Adhesive of Nano-BN as Addttive

Author: HeYanRu
Tutor: TangChengChun
School: Hebei University of Technology
Course: Materials Physics and Chemistry
Keywords: epoxy BN nanospheres thermal adhesive surface modification property
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 108
Quote: 0
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Abstract


In this paper nano-BN were surface modified by different surface modifying agents and different approachs.SEM, FT-IR and Laser particle size analysis were carried out to characterize the dispersion of modified nano-BN. Modified nano-BN were added into the epoxy matrix to form thermal adhesive, using thermal conductivity tester and thermogravimetry analysis methods to test the thermal performances of thermal adhesive. The result showed that modified BN nanospheres improved the thermal properties of thermal adhesive.1. According to the structure and surface properties of BN nanospheres, using several surface modifying agents, including polyvinylpyrrolidone(PVP), ethylenediaminetetraacetic acid disodium(EDTA-Na2), silane coupling agents KH570, sodium dodecyl benzene sulfonate (SDBS), hexadecyl trimethyl ammonium Bromide(CTAB),and different approachs to modify BN nanospheres. Testing results showed that PVP and EDTA-Na2 modified BN nanospheres were better. SEM, FT-IR and Laser particle size analysis test results showed that the dispersion of modified BN nanospheres were better than nonmodified BN nanospheres.2. In order to ensure that the viscosity of epoxy matrix was same in every experiment, testing showed, when the mass fraction of non-reactive diluents was 15%, the viscosity of epoxy resin was basic stabilizing, it did not have different effects for nano-particle added into epoxy. So 15wt% is the best dosage of non-reactive diluent.3. By FT-IR testing, we found the most suitable curing process for epoxy: curing 12h at 60℃.4. Under the conditions of determined viscosity and curing process, the thermal conductivity and thermal stability of thermal adhesive were tested. It showed that the BN nanospheres modified by PVP or EDTA-2Na can increase thermal conductivity and thermal stability of the thermal adhesive. The PVP surface grafted BN nanospheres made the thermal conductivity of thermal adhesive increasing 56.12%, the thermal decomposition temperature increasing 29.8℃. The EDTA-2Na surface chemical modified BN nanospheres made the thermal conductivity of thermal adhesive increasing 35.97%, the thermal decomposition temperature increasing 23.5℃.

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