ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Polymerization of α-methylstyrene with n-butyllithium was carried out in the presence of some additives such as LiBr, LiOH, LiOBu, and LiN(Et)2 in THF. The change in the color of the α-methylstyryl anion with amount of the additives, the activity of n-BuLi, the average molecular weights, and the molecular weight distributions of polymers obtained were observed to clarify the interaction of n-BuLi (or of α-methylstyryl anion) with these additives. It was concluded that LiBr and LiOH deactivate the initiator in the mole ratio of 1:1 and only the remaining part of n-BuLi participates in polymerization, while LiOBu and LiN(Et)2 do not. The order of the additives in the capacity to form deactivating centers (possibly by complex formation) follows the order of nucleophilicity and is opposite to the order of activity for initiating the polymerization. The molecular weight distribution of the polymer obtained with pure n-BuLi in the absence of additives was extremely sharp.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1965.100030614
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