TY - JOUR
T1 - Elucidating the stabilizing effect of oleic acid coated LaF3
T2 - Nd3+ nanoparticle surface in the thermal degradation of PMMA nanocomposites
AU - Nampoothiri, Pramod K.
AU - Gandhi, Mayuri N.
AU - Kulkarni, Ajit R.
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/4/1
Y1 - 2017/4/1
N2 - Thermal degradation of PMMA nanocomposites with functionalized nanoparticles as filler material is studied. Nanocomposites of PMMA with oleic acid (OA) functionalized LaF3: Nd3+ nanoparticles (OA-NPs, 2–3 nm) were prepared by solvent mixing and casting method. Minimal loss of optical transparency observed in nanocomposites was attributed to good dispersion of OA-NPs in PMMA matrix. Further thermogravimetric analysis (TGA) of PMMA, OA-PMMA and OA-NP/PMMA nanocomposites were carried out in nitrogen atmosphere and three degradation steps were observed. Evolved products during the thermal degradation of PMMA, OA-PMMA and NC-25 (nanocomposites with 25 wt% of OA-NPs) were analyzed by mass spectroscopy. Delayed evolution of radicals and MMA (methyl methacrylate) at third degradation step was observed in OA-PMMA film and NC-25. Differing to PMMA and OA-PMMA, evolved gas mass spectrum of NC-25 did not show presence of methoxy radicals and monomer at first and second step of degradation. The glass transition studies revealed the increase in glass transition temperature with nanoparticle concentration. This was attributed to the physical interaction of PMMA chains with OA-NPs and formation of interface region of low mobile PMMA chains around OA-NPs. Hence the improvement in the stability of OA-NP/PMMA was attributed to the formation of low mobile PMMA chains around nanoparticles.
AB - Thermal degradation of PMMA nanocomposites with functionalized nanoparticles as filler material is studied. Nanocomposites of PMMA with oleic acid (OA) functionalized LaF3: Nd3+ nanoparticles (OA-NPs, 2–3 nm) were prepared by solvent mixing and casting method. Minimal loss of optical transparency observed in nanocomposites was attributed to good dispersion of OA-NPs in PMMA matrix. Further thermogravimetric analysis (TGA) of PMMA, OA-PMMA and OA-NP/PMMA nanocomposites were carried out in nitrogen atmosphere and three degradation steps were observed. Evolved products during the thermal degradation of PMMA, OA-PMMA and NC-25 (nanocomposites with 25 wt% of OA-NPs) were analyzed by mass spectroscopy. Delayed evolution of radicals and MMA (methyl methacrylate) at third degradation step was observed in OA-PMMA film and NC-25. Differing to PMMA and OA-PMMA, evolved gas mass spectrum of NC-25 did not show presence of methoxy radicals and monomer at first and second step of degradation. The glass transition studies revealed the increase in glass transition temperature with nanoparticle concentration. This was attributed to the physical interaction of PMMA chains with OA-NPs and formation of interface region of low mobile PMMA chains around OA-NPs. Hence the improvement in the stability of OA-NP/PMMA was attributed to the formation of low mobile PMMA chains around nanoparticles.
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U2 - 10.1016/j.matchemphys.2016.12.075
DO - 10.1016/j.matchemphys.2016.12.075
M3 - Article
AN - SCOPUS:85011660642
SN - 0254-0584
VL - 190
SP - 45
EP - 52
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
ER -