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Crystallization behavior and mechanical properties of a nylon‐6, ‐6/6, and ‐12 terpolyamide
Author(s) -
Davis Charles R.
Publication year - 1996
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/(sici)1097-4628(19961226)62:13<2237::aid-app8>3.0.co;2-k
Subject(s) - crystallinity , materials science , differential scanning calorimetry , crystallization , tacticity , amorphous solid , polyamide , polymer , copolymer , nylon 6 , recrystallization (geology) , polymer chemistry , ultimate tensile strength , composite material , nylon 66 , chemical engineering , crystallography , chemistry , polymerization , thermodynamics , paleontology , physics , biology , engineering
Composition, tacticity, and processing history can affect the morphology of semicrystalline polymers. Although homopolyamides are a family of polymers well known for semicrystalline character, through copolymerization or multicomponent copolymerization significant changes in materials' crystalline and thermal properties can occur. Due to chain irregularities introduced by terpolymerization, differential scanning calorimetry shows RDG 114T, a commercial polyamide of nylon‐6, ‐6/6, and 12, to have an atypically low T m and exhibit interesting recrystallization behavior. Specifically, the polyamide is wholly amorphous upon cooling from the melt, and since its T g is about 20°C (due to the presence of plasticizers), chain ordering is found to occur over time at room temperature. Since the polyamide's morphology is time‐dependent, the tensile properties of the polymer are also found to vary with ambient aging. For instance, Young's moduli for an amorphous and 7‐day room temperature‐annealed sample are 1.3×10 2 and 2.8×10 2 MPa, respectively. © 1996 John Wiley & Sons, Inc.