Autor(es):
Dencheva, Nadya Vasileva 
; Pouzada, A. S. ; Kearns, Mark P. ; Denchev, Z. ; Oliveira, Maria J.
Data: 2011
Identificador Persistente: http://hdl.handle.net/1822/13563
Origem: RepositóriUM - Universidade do Minho
Assunto(s): Nanocomposites; Polymer blends; Mechanical tests
Descrição
The mechanical behavior of microfibrilar composites (MFC), consisting of a matrix of high-density polyethylene (HDPE) and reinforcement of polyamide 6 (PA6) fibrils, with and without compatibilization, was studied. The composites were produced by conventional processing techniques with various shape and arrangement of the PA6 reinforcing entities: long, unidirectional, or crossed bundles of fibrils (UDP and CPC, respectively), middle-length, randomly oriented bristles (MRB), or non-oriented micrometric PA6 spheres (NOM). The tensile, flexural, and impact properties of the MFC materials (UDP, CPC, and MRB) were determined as a function of the PA6 reinforcement shape, alignment and content, and compared with those of NOM, the non-fibrous composite It was concluded that the in-situ MFC materials based on HDPE/PA6 blends display improvements in the mechanical behavior when compared with the neat HDPE matrix, e.g., up to 33% for the Young modulus, up to 119% for the ultimate tensile strength, and up to 80% for the flexural stiffness.
