STRUCTl'RAL I'ACTORS IN POLYMERl/ATION 



41 



Fig. 2. Ultraviolet absorption by natural 

 (gymnosperm) lijjnin and synthetic tornud from 

 eugenol. 



0.4 r 



0.3 



D 



0.2 



0.1 



• KLASON EUOENOL LIGNIN 

 o KLASON SPRUCE LIGNIN 



X- m}i 



240 260 280 300 



vascular strands could be extracted only with ethanol-HCl, and is in a partially 

 depolymerized state with a contribution to apparent methoxy content derived 

 from the solvent. Molecular weight determinations (Rast) were carried out 

 with success only on the solubilized celery lignin and yielded a value of 667 ± 17, 

 corresponding to a partially ethoxylated trimer. Eugenol, although the precursor 

 of these lignins, is not itself to be regarded as a monomer. Clearly, the difiEerences 

 in composition presented show that eugenol is first transformed (peroxidized) 



Table i. Comp.\rison of natural an'd synthetic lignins 



PROPERTV 



Composition, % 



c 



H 

 OCH3 



Solubility 

 Water 

 KOH 

 Ethanol 

 Ethanol-HC! 

 Acetone 

 Dioxane 



U. V. spectrum 

 Max., m/j. 



Min., mfj. 

 Molar extinction 



Color with Cl2+Na..S03 Red 



