Thermal and optical properties of poly(methyl methacrylate)/calcium carbonate nanocomposite

Figures & data

Figure 1. (a) SEM micrograph for neat PMMA polymer fractured surface. (b) SEM micrograph for PMMA/CaCO₃ nanocomposite fractured surface.

Table 1. Flexural properties and glass transition temperature of neat PMMA and PMMA/CaCO₃ nanocomposite.

Material	Flexural modulus (MPa)	Ultimate strength (MPa)	Ultimate strain	Glass transition temperature T g (°C)
PMMA	1880	19	0.0137	90
PMMA/CaCO3	2450	18	0.0102	120

Figure 2. Thermal conductivity apparatus.

Figure 3. Shows the variation of thermal conductivity vs. temperature for PMMA/CaCO₃ nanocomposite.

Figure 4. The variation of thermal resistance vs. temperature for PMMA/CaCO₃ composite.

Figure 5. The optical absorption spectra for PMMA/CaCO₃ composite.

Figure 6. Evaluated E _g from optical absorption spectra of the samples.

Table 2. The obtained optical data of neat PMMA and PMMA/CaCO₃.

Material	E opt (eV)	β	ΔE (eV)
PMMA	4.50	150	0.221
PMMA/CaCO3	3.32	135	0.318

Figure 7. The linear dependence of ln α vs. hν.