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Table 4 Relative signal area (%) and VCT parameters (ms) over chemical shift regions (ppm) in CPMAS-NMR spectra of bio-polymer samples at initial and final experimental time

From: Decomposition of bio-degradable plastic polymer in a real on-farm composting process

  Carbonyl-C n Aromatic-C h O-Alkyl-C u Alkyl-C f
180–170 170–160 140–130 130–120 110–100 90–80 80–70 70–60 40–30 30–20
t0 2.6 3.4 5.4 10.4 6.0 6.1 20.5 20.3 7.4 17.7
Test B 4.1 5.3 8.0 18.6 24.2 11.1 28.7
Test C 4.0 5.3 8.6 18.9 23.5 9.7 30.0
VCT parameters
  Aromatic-C (160–110) O-alkyl-C (110–60) Alkyl-C (45–0)
tCH t1rH tCH t1rH tCH t1rH
t0 0.07 100 0.06 78 0.08 100
Test B
 Sample 4 0.05 62 0.03 12 0.06 25
 Sample 5 0.05 60 0.03 15 0.05 28
 Sample 6 0.04 64 0.03 15 0.06 32
Test C
 Sample 7 0.04 78 0.03 14 0.05 33
 Sample 8 0.04 65 0.03 15 0.05 27
 Sample 9 0.05 70 0.03 13 0.05 32