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Influence of thermal and mechanical histories on the viscoelastic behavior of drawn polyethylene
Author(s) -
Pereña J. M.,
Benavente R.,
Fatou J. M. G.
Publication year - 1982
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.1982.070270231
Subject(s) - polyethylene , viscoelasticity , crystallinity , materials science , linear low density polyethylene , composite material , annealing (glass) , protein filament , elasticity (physics) , thermal , activation energy , relaxation (psychology) , thermodynamics , chemistry , physics , psychology , social psychology
Storage and loss elasticity complex moduli E ′ and E ″ and temperatures at which the α relaxation takes place are studied with respect to thermal history, deformation speed, and molecular weight distribution of drawn linear polyethylene. Maximum values of E ′ and E ″ increase with draw ratio of the hot‐drawn samples, and the α relaxation temperatures increase by around 10°C when the polyethylene filaments are annealed at 110°C. The activation energy of the process, considered as a single one because the symmetrical shape of the maxima, increases with draw ratio, and this increase is less pronounced when the filaments are annealed. Annealing of the filaments produces a decrease in their E ′ values, but this decrease is almost negligible for filaments obtained from polyethylene with a broad molecular weight distribution. The final crystallinity of the filaments drawn at room temperature and subsequently annealed is higher for the filaments obtained at lower drawing speed.