Shrinkage processes in two types of acrylic fibres in heating in air in different regimes in the 50-250 degrees C temperature region were investigated by a thermomechanical method. The mechanisms of the shrinkage were revealed in heating-cooling cycles and its partial reversibility and relation with the cyclization reaction was demonstrated. The irreversible part of shrinkage of the fibers is due to cyclization and relaxation of the macromolecules, while reversible shrinkage is due to the entropic elasticity of the polymer macromolecules.
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Univ Evora, Dept Quim, Colegio Luis Antonio Verney, P-7000671 Evora, PortugalUniv Evora, Dept Quim, Colegio Luis Antonio Verney, P-7000671 Evora, Portugal
Carrott, PJM
Nabais, JMV
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机构:Univ Evora, Dept Quim, Colegio Luis Antonio Verney, P-7000671 Evora, Portugal
Nabais, JMV
Carrott, MMLR
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机构:Univ Evora, Dept Quim, Colegio Luis Antonio Verney, P-7000671 Evora, Portugal
Carrott, MMLR
Pajares, JA
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机构:Univ Evora, Dept Quim, Colegio Luis Antonio Verney, P-7000671 Evora, Portugal