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Impact resistance performances of polyamide 6 blended with different rubber phases
Author(s) -
Crespy A.,
Caze C.,
Coupe D.,
Dupont P.,
Cavrot J. P.
Publication year - 1992
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760320407
Subject(s) - materials science , izod impact strength test , differential scanning calorimetry , polyamide , natural rubber , copolymer , composite material , charpy impact test , maleic anhydride , polymer blend , scanning electron microscope , polymer , methacrylate , polymer chemistry , ultimate tensile strength , physics , thermodynamics
We have studied the impact strength, by Charpy and Izod tests, of blends of polyamide 6 with different rubbers, 10 wt% of each, or rubbers and glass fibers (8.5 wt% and 15 wt% respectively). The rubbers are from three different families: ( i ) a nonreactive cross‐linked terpolymer, methyl methacrylate/butadiene/styrene (17/64.5/18.5); ( ii ) two block copolymers compatible with the matrix, poly(tetramethylene glycol)/polamide 12 (70/30 or 34/66); and ( iii ) two polymers containing reactive functionality, a terpolymer ethylene/ethyl acrylate/maleic anhydride (68/30.5/1.5) and a copolymer ethylene/acrylic acid (90/10). The classification of additives in regard to improved impact depends on the procedure used for the impact strength measurement, particularly on whether the samples are notched or unnotched. The results are discussed in relation to the dimensions and the adhesion of the rubber particles. The level of adhesion has been estimated from observations in scanning electron microscopy of cavities due to pullout nodules and of nonextracted rubber after treatment in boiling xylene. Strong variations in the morphologies are found, depending on the chemical nature of the rubber. The crystalline state of the polyamide in the blends has also been evaluated from differential scanning calorimetry.