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      Low-carbon aliphatic am
      
	    
      
		
    6. Di-n-propylamine
    7. Triethylamine
      8.         
      Polymerization initiato
      
	    
      
		        
      Dimethyl carbonate
      
	    
      
		        
      Other organic chemicals
      
	    
      
		
    8. Benzyl Triethyl Ammoniu
    9. Tetrabutylammonium brom
      10.         
       
		
      
	
      
	
      
  
      


  
      
    
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