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Coefficient of thermal expansion for Twaron® fibers using crystallographic data
Author(s) -
Jain Anjana
Publication year - 2008
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.20808
Subject(s) - thermal expansion , materials science , aramid , composite material , fiber , atmospheric temperature range , volume (thermodynamics) , thermal , temperature coefficient , thermodynamics , physics
The effect of in situ heating on the unit cell dimensions of crystalline aramid fiber (Twaron® fibers) has been studied in the temperature range 20–280°C. The changes in the unit cell dimensions have been used to estimate the coefficients of thermal expansion along the axial directions. On heating, the a and b axes expand, the coefficients of thermal expansion being α a = 35.84 × 10 −6 /°C and α b = 38 × 10 −6 /°C at room temperature. The c ‐axis contracts on heating, giving negative coefficient of thermal expansion α c = −5.38 × 10 −6 /°C at room temperature. Volume coefficient of thermal expansion α V however is positive, being 101.22 × 10 −6 /°C. POLYM. ENG. SCI., 2008. © 2007 Society of Plastics Engineers