Page 525 - Handbook of Properties of Textile and Technical Fibres

498 Handbook of Properties of Textile and Technical Fibres

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T g (deg) 82 Data 1
Linear

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0 5 10 15 20
PEN concentration (%)
Figure 13.37 Dependence of glass transition temperature T g on poly(ethylene-2,6-naphthalate)
(PEN) fraction f.

IM Initial modulus (cN/dtex) as modulus at 10% deformation
SM (cN/dtex) secant modulus as 100 P/E
WT (cN/dtex) toughness as (P E)/50
P y (cN/dtex) yield point stress as stress in point with maximal curvature on stress-strain curve
ε y (%) yield elongation as deformation in point with maximal curvature on stress-strain curve
ε p (%) plateau elongation as deformation corresponding to the plateau in post-yield region
Results of mechanical measurements are given in Tables 13.4 and 13.5.In
brackets are given coefficients of variation CV(%). These coefficients show

Table 13.4 Stress-strain curve parameters (Militký et al., 2011)

Modulus
Titre Tenacity Elongation 10% Toughness
Sample (Dtex) (cN/dtex) (%) (cN/dtex) WT (cN/dtex)
A 6.09 (7.2) 26.7 (10.5) 107.8 (18.2) 96.4 (13.8) 14.39
B 6.84 (12.5) 24.6 (8.1) 93.7 (18.6) 87.4 (9.4) 11.52
C 6.74 (20.4) 30.2 (15.7) 64.2 (29.8) 98.6 (14.3) 9.69
D 6.58 (16.9) 28.6 (12.5) 52.9 (39.7) 95.7 (10.3) 7.56
E 8.54 (19.4) 24.2 (12.7) 64.1 (46.3) 77.5 (11) 7.75