Grafting of maleic anhydride to hydrocarbons below the ceiling temperature

Autor:	K. E. Russell
Rok vydání:	1995
Předmět:	Alkane chemistry.chemical_classification Polymers and Plastics Organic Chemistry Succinic anhydride Maleic anhydride Hydrogen atom abstraction Ceiling temperature chemistry.chemical_compound Monomer Hydrocarbon chemistry Squalane Polymer chemistry Materials Chemistry Organic chemistry
Zdroj:	Journal of Polymer Science Part A: Polymer Chemistry. 33:555-561
ISSN:	1099-0518 0887-624X
DOI:	10.1002/pola.1995.080330322
Popis:	Maleic anhydride has been grafted to eicosane and squalane at 60–80°C using 1,2-dichlorobenzene as solvent and benzoyl peroxide as initiator. These hydrocarbons are low molecular weight models for hydrocarbon polymers containing secondary and tertiary hydrogen atoms. In the absence of the hydrocarbon and with monomer concentrations of the order of 1M, low molecular weight poly(maleic anhydride) is formed. On addition of the hydrocarbon, the main product is grafted material and very little homopolymer is formed. The grafts consist primarily of single succinic anhydride units but some of them are short poly(maleic anhydride) chains. Ceiling temperature considerations control the formation of homopolymer in the absence of hydrocarbon substrate. In the presence of eicosane or squalane, initiation of grafting proceeds by hydrogen abstraction from the hydrocarbon. The main factor controlling graft length is then the ratio of the rates of intramolecular hydrogen abstraction and of monomer addition to succinic anhydride radicals © 1995 John Wiley & Sons, Inc.
Databáze:	OpenAIRE
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