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Table 5 Mechanical properties of hemp fibre composites after the different treatments

From: Comparison of traditional field retting and Phlebia radiata Cel 26 retting of hemp fibres for fibre-reinforced composites

Treatment Period Composite properties (Vf = 50%) Calculated fibre properties
Stiffness
Ec (GPa)
UTSc
(MPa)
Porosity
Vp (%)
Ef
(GPa)
Porosity
αpf (%)
Untreated 0 33.8 (0.6) 294 (14) 7.9 (0.4) 64.9 (1.2) 15.7 (0.8)
Field retted 20 days 26.9 (0.6) 248 (17) 8.1 (0.6) 51.2 (1.1) 16.2 (1.2)
Fungal retting 7 days 32.2 (0.5) 283 (8) 6.6 (0.8) 61.6 (0.9) 13.1 (1.5)
14 days 34.5 (0.5) 300 (9) 4.9 (0.4) 66.2 (0.9) 9.7 (0.7)
20 days 34.8 (0.3) 307 (6) 5.5 (0.5) 66.9 (0.6) 10.9 (0.9)
PectinaseA 90 min 35.2 (1.0) 306 (15) 6.0 (0.3) 67.6 (1.9) 11.9 (0.6)
HTT + pectinaseA 90 min 38.2 (0.8) 325 (6) 4.2 (0.2) 73.6 (1.6) 8.4 (0.4)
  1. Values are means (standard error)
  2. AWith or without autoclave treatment (HTT) at 1 bar (121 °C) for 30 min before the pectinase treatment (Liu et al. 2016b)