Influence of Coupling Agent in Mechanical, Physical and Thermal Properties of Polypropylene/Bamboo Fiber Composites: Under Natural Outdoor Aging.

Autor: Fajardo Cabrera de Lima LDP; Departamento de Materiais da UFRGS, University of Valle, Cali 13 #100-00, Colombia.; Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Porto Alegre 9500-970, Brazil., Santana RMC; Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Porto Alegre 9500-970, Brazil., Chamorro Rodríguez CD; Departamento de Materiais da UFRGS, University of Valle, Cali 13 #100-00, Colombia.
Jazyk: angličtina
Zdroj: Polymers [Polymers (Basel)] 2020 Apr 17; Vol. 12 (4). Date of Electronic Publication: 2020 Apr 17.
DOI: 10.3390/polym12040929
Abstrakt: Researches on thermoplastic composites using natural fiber as reinforcement are increasing, but studies of durability over time are scarce. In this sense the objective of this study is to evaluate changes in the properties of polypropylene/bamboo fiber (PP/BF) composite and the influence of the use of coupling agent (CA) in these composites after natural ageing. The PP/BF (70/30 wt) composites and 3% wt CA (citric acid from natural origin and maleic anhydride grafted polypropylene from petrochemical origin) were prepared by using an internal mixer chamber and then injection-molded. The samples were exposed to natural weathering for a total period of 12 months and characterized before and after exposure. All exposed composites experienced a decrease in their properties, however, the use of CA promoted more stability; in mechanical properties, the composites with CA showed lower loss about 23% in Young's modulus, 18% in tensile stress at break, and 6% in impact strength. This behavior was similar in thermal and physical properties, the result for the CA of natural origin being similar to that of synthetic origin. These results indicate that the use of a CA may promote higher interaction between the fiber and the polymer. In addition, the CAs of organic origin and synthetic origin exhibited similar responses to natural ageing.
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje