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Table 1 Functional groups and molecular weight of the lignin samples

From: Effect of replacing polyol by organosolv and kraft lignin on the property and structure of rigid polyurethane foam

Lignin

Ph-OH

Al-OH

MeO

Mw

Mn

Mw/Mn

 

mmol/g

mmol/g

mmol/g

   

HEL

2.76

2.88

6.16

2600

1600

1.62

HKL

4.29

4.12

5.81

2400

1330

1.80

  1. Note: HEL, hardwood ethanol organosolv lignin; HKL, hardwood kraft lignin; Ph-OH, phenolic hydroxyl group; Al-OH, aliphatic hydroxyl group; MeO, methoxyl group; Mw, weight average molecular weight; Mn, number average molecular weight.