Evaluation of urea encapsulation by microcapsules of PHB/MMT and PHB/OMMT nanocomposites - Arjona, Jéssica de Carvalho; Valenzuela Díaz, Francisco Rolando; Wiebeck, Hélio; Wang, Shu Hui; Silva-Valenzuela, Maria das Graças da (Characterization of Minerals, Metals and Materials, 2018)