Structure/Property Relationships of Poly(L-lactic Acid)/Mesoporous Silica Nanocomposites

Journal of Polymers. 2013;2013 DOI 10.1155/2013/162603

Author

AUTHORS
Javier Gudiño-Rivera (Facultad de Ciencias Químicas, CIEP-FCQ, Universidad Autónoma de San Luis Potosí, Avenida Dr. Manuel Nava Martínez 6, 78210 San Luis Potosí, SLP, Mexico) 

Francisco J. Medellín-Rodríguez (Facultad de Ciencias Químicas, CIEP-FCQ, Universidad Autónoma de San Luis Potosí, Avenida Dr. Manuel Nava Martínez 6, 78210 San Luis Potosí, SLP, Mexico) 

Carlos Ávila-Orta (Centro de Investigación en Química Aplicada, Boulevard Enrique Reyna 140, P.O. Box 379, 25100 Saltillo, COAH, Mexico) 

Alma G. Palestino-Escobedo (Facultad de Ciencias Químicas, CIEP-FCQ, Universidad Autónoma de San Luis Potosí, Avenida Dr. Manuel Nava Martínez 6, 78210 San Luis Potosí, SLP, Mexico) 

Saúl Sánchez-Valdés (Centro de Investigación en Química Aplicada, Boulevard Enrique Reyna 140, P.O. Box 379, 25100 Saltillo, COAH, Mexico) 

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 12 weeks

Abstract | Full Text

Biodegradable poly(L-lactic acid) (PLLA)/mesoporous silica nanocomposites were prepared by grafting L-lactic acid oligomer onto silanol groups at the surface of mesoporous silica (SBA-15). The infrared results showed that the lactic acid oligomer was grafted onto the mesoporous silica. Surface characterization of mesoporous silica proved that the grafted oligomer blocked the entry of nitrogen into the mesopores. Thermal analysis measurements showed evidence that, once mixed with PLLA, SBA-15 not only nucleated the PLLA but also increased the total amount of crystallinity. Neat PLLA and its nanocomposites crystallized in the same crystal habit and, as expected, PLLA had a defined periodicity compared with the nanocomposites. This was because the grafted macromolecules on silica tended to cover the lamellar crystalline order. The g-SBA-15 nanoparticles improved the tensile moduli, increasing also the tensile strength of the resultant nanocomposites. Overall, the silica concentration tended to form a brittle material.

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