Thermal stability of the novel polybenzoxazines was investigated by TGA under nitrogen exposure. The TGA profiles of B-ala, PBTMDS oligomer and B-ala-PMDS polymer are shown in Figure 4.9. It can be seen that although the thermal stability of the cured B-ala is significantly improved in PBTMDS by incorporating siloxane units, it is decreasing in B-ala-PMDS polymer. It is known that polyhedral oligomeric silsesquioxane (POSS) and polybenzoxazine composites exhibit better thermal stability than polybenzoxazines themselves.
Figure 4. 9 : The results of B-ala (a); PBTMDS oligomer (b); PBTMDS copolymer(c)
The film forming properties and flexibility of benzoxazine-siloxane were also demonstrated. For this purpose, free standing films were prepared by the method of solvent casting of the polymers on Teflon plates. As can be seen from Figure 4.10, the copolymer completely bendable without any problem. After heat treatment a cured film retained its size and shape.
(a) (b)
5. CONCLUSION
In conclusion, we have synthesized high molecular weight polysiloxane containing benzoxazine moities. Thermally activated ring opening reaction in the absence of added catalyst to form cross-linked polymer network. Thermal crosslinking nature provides the possibility to prepare high performance materials. The enhanced thermal stability was attributed to presence of the siloxane units. These features give an oppotunity to form molecular flexibility, tough and thermal stability of cross-linked polybenzoxazine films.
46
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CURRICULUM VITA
Candidate’s full name : Dilek SUREKA Place and date of birth : Istanbul,1982 Universities and
Colleges attended : Ankara University Science Faculty Chemistry Department (2000-2006)