Navegando por Palavras-chave "properties and characterization"

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    Active packaging material based on buriti oil - Mauritia flexuosa L.f. (Arecaceae) incorporated into chitosan films
    (Wiley-Blackwell, 2016) Silva, Mariangela de F.; Lopes, Patricia S. [UNIFESP]; da Silva, Classius F. [UNIFESP]; Yoshida, Cristiana M. P. [UNIFESP]
    Active and biodegradable materials have great potential in food packaging applications, improving the safety and quality of products. The objective of this study was to develop a new material based on buriti oil incorporated into a chitosan film. Different concentrations of buriti oil in dried films (2.1 g/m(2), 10.4 g/m(2), 20.8 g/m(2), and 31.3 g/m(2)) were added into a chitosan matrix (41.7 g/m(2)). The chitosan/buriti oil films were characterized by water-vapor barrier properties, total water-soluble matter (TSM), tensile properties, thermogravimetric analysis, microstructure, microbial permeation properties, and biodegradation estimation. The higher oil concentration improved the water-vapor barrier and the buriti oil acted largely as a plasticizer and increased the elongation at break, and decreased the tensile strength (TS) of chitosan films. The total water-soluble matter of chitosan films decreased in function of the buriti oil concentration, but the biodegradation and thermal stability increased. The chitosan films presented a microbial barrier against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. (C) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43210.
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    Investigations of the Electrical Conduction Mechanisms of Polyaniline-DBSA/Poly(acrylonitrile-butadiene styrene) Blends
    (Wiley-Blackwell, 2014-09-05) Campos, Milton; Miziara, Thiago A. S.; Cristovan, Fernando H. [UNIFESP]; Pereira, Ernesto C.; UNIP Univ Paulista; Universidade Federal de São Paulo (UNIFESP); Universidade Federal de São Carlos (UFSCar)
    The electrical properties of Al/PANI-DBSA/ABS/Au blend with PANI (5%) w/w have been investigated by using of current-voltage (I-V) measurements, in a temperature range of 100-313 K. the analysis of I-V characteristics in the forward direction was based on thermionic emission mechanism for applied electrical field till similar to 3 x 10(2) V/cm. the thickness dependence of the current-voltage relationship, clearly demonstrates that the electrical current for larger fields is space charge limited current (SCLC). Temperature dependences of the ideality factor, barrier height, and series resistance have been calculated. the mobility of carriers which is temperature dependent was calculated using the trap free SCLC as 1.53 x 10(-4) cm(2) V-1 s(-1) at room temperature. (C) 2014 Wiley Periodicals, Inc.