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The effect of the secondary relaxations on the fracture toughness of nylon 6/amorphous nylon 6IcoT blends
Author(s) -
Liu Yun,
Donovan James A.
Publication year - 1996
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.10632
Subject(s) - materials science , nylon 6 , toughness , composite material , fracture toughness , crystallinity , amorphous solid , nylon 66 , relaxation (psychology) , polymer , crystallography , polyamide , psychology , social psychology , chemistry
The fracture toughness of semicrystalline nylon 6, amorphous nylon 6IcoT, and their blends can be represented as the inherent toughness plus the toughness due to the formation of the crack tip plastic zone. The inherent toughness originates mostly from the molecular alignment near the crack tip plus a small contribution from chain scission. The plastic zone contribution is determined by its size and the energy dissipated by irreversible plastic deformation. The inherent toughness and the energy dissipated in the process zone are temperature dependent and primarily determined by the stress‐induced molecular movement, which is related to the operative secondary β or γ relaxation.