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Preparation and characterization of polyamide 6/liquid natural rubber blends
Author(s) -
Shashidhara G. M.,
Pradeepa K. G.
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39750
Subject(s) - materials science , composite material , polyamide , ultimate tensile strength , izod impact strength test , natural rubber , brittleness , percolation threshold , tear resistance , volume fraction , flexural strength , polymer blend , percolation (cognitive psychology) , polymer , engineering , neuroscience , biology , electrical engineering , copolymer , electrical resistivity and conductivity
This study presents a new approach to toughen Polyamide 6 (PA6) by using a low‐molecular weight liquid natural rubber (LNR). The LNR is prepared by mastication of pale latex crepe in the presence of 0.5 phr Peptizol 7. The PA6/LNR blend samples are characterized in terms melt flow index, hardness, abrasion resistance, impact strength, flexural strength, tensile strength, and thermal properties. The impact strength of PA6 increases by about 67% upon addition of 10% LNR. The percolation model is applied to study of brittle to ductile transition. The percolation threshold for the brittle to ductile transition of the blend was found to be 14.5 wt % LNR, corresponding to the critical volume fraction of the stress volume, V sc = 0.58, which is consistent with the calculated value of ≈ π/6. The PA6/LNR blends exhibit cavitation and matrix shear yielding, which would be the main contribution to the increases impact strength. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39750.