Development and characterization of functionalized Al₂O₃ and TiO₂-reinforced polybenzoxazine nanocomposites

Figures & data

Figure 1. FTIR Spectra of (a) F-Al₂O₃ and (b) F-TiO_2.

Figure 2. FTIR spectrum of neat CPBz matrix and F-Al₂O₃/CPBz nanocomposites.

Figure 3. FTIR spectrum of F-TiO₂/CPBz nanocomposites.

Figure 4. MALDI–Mass spectrum of CBz.

Figure 5. TGA analysis of neat CPBz matrix and F-Al₂O₃/CPBz nanocomposites.

Figure 6. TGA analysis of F-TiO₂/CPBz nanocomposites.

Table 1. Thermal and dielectric properties of neat CPBz matrix and varying weight percentages of F-Al₂O₃ and F-TiO₂-reinforced polybenzoxazine nanocomposites.

Sample	Tg (°C)	Weight loss			Char yield (%) at 700 (°C)	Dielectric constant (K)
		10	20	30
		Temperature (°C)
Neat CBz	95	355	395	421	13	3.67
1 wt% F-Al2O3/CPBz	113	357	401	431	27	4.01
3 wt% F-Al2O3/CPBz	124	367	407	437	44	5.21
7 wt% Al2O3/CPBz	–	–	–	–	–	5.62
5 wt% F-Al2O3/CPBz	133	369	411	439	46	6.59
7 wt% F-Al2O3/CPBz	137	371	417	441	48	8.01
1 wt% F-TiO2/CPBz	162	330	401	430	17	6.1
3 wt% F-TiO2/CPBz	169	332	405	433	19	6.9
7 wt% TiO2/CPBz	–	–	–	–	–	7.5
5 wt% F-TiO2/CPBz	172	347	407	436	22	8.6
7 wt% F-TiO2/CPBz	176	357	420	455	31	10.2

Figure 7. XRD analysis of alumina, neat CPBz matrix and F-Al₂O₃/CPBz nanocomposites.

Figure 8. XRD analysis of TiO₂ and F-TiO₂/CPBz nanocomposites.

Figure 9. SEM images of Al₂O₃ and TiO₂ (a and d), F-Al₂O₃ and F-TiO₂ (b and e) and 5 wt% F-Al₂O₃ and F-TiO₂ reinforced CPBz nanocomposites (c and f).

Figure 10. TEM images of (a) 5 wt% F-Al₂O₃ and (b) F-TiO₂ reinforced CPBz nanocomposites.

Figure 11. Dielectric constant of neat CPBz matrix and F-Al₂O₃/CPBz nanocomposites.

Figure 12. Dielectric constant of F-TiO₂/CPBz nanocomposites.

Figure 13. UV transmittance of neat CPBz and F-Al₂O₃/CPBz nanocomposites.

Figure 14. UV transmittance of F-TiO₂/CPBz nanocomposites.

Scheme 1. Synthesis of CBz monomer.

Scheme 2. Preparation of F-Al₂O₃ and F-TiO₂/CPBz nanocomposites.