Dispersion of upconverting nanostructures of CePO4 using rod and semi-spherical morphologies into transparent PMMA/PU IPNs by the sequential route
journal contributionposted on 12.06.2018 by D. Palma-Ramirez, M.A. Dominguez-Crespo, A.M. Torres-Huerta, V.A. Escobar-Barrios, H. Dorantes-Rosales, Helen Willcock
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Upconverting luminescent poly (methylmethacrylate) (PMMA)/poly (urethane) (PU) interpenetrating polymer network (IPN) nanohybrids were prepared using a sequential polymerisation incorporating different wt.% of cerium phosphate (CePO 4 ) nanoparticles. The effect of miscibility/compatibility of the different PMMA/PU ratios, the addition and dispersion of rod and semi-spherical nanostructures in as well as the performance of selected IPNs under accelerated aging were studied using morphological, emission, thermal and mechanical studies. Structural studies revealed that there were physical interactions between C[dbnd]O groups and CePO 4 in PMMA/PU IPNs. The addition of a higher wt.% of nanostructures was found to decrease the transparency of the IPNs. Resulting PMMA/PU/CePO 4 IPN nanohybrids are photoluminescent under UV-light, supporting the prolongate of lifetime while maintaining the mechanical properties after being subjected to accelerated weathering. The addition of semi-spherical particles resulted in a more stable materials after accelerated weathering than nanorods.
D. Palma-Ramirez is grateful for her postgraduate fellowship to CONACYT, COFAA and SIP-IPN. The authors are also grateful for the financial support provided by Instituto Politecnico Nacional through the SIP2017-1186, and COFAA; CONACYT through the CB-20151320 and SNI-CONACYT.
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