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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