ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
When all the modifier is dissolved in the polymer particles the chain transfer constant, d log (RSH)/d log (M) of n-octyl mercaptan at 90% conversion in the emulsion polymerization of butadiene (50°C) is 19, the same value as in bulk and in emulsion at 0% conversion. The relative rate of consumption of mercaptan and monomer is unaffected by variation of persulfate and presence of a diluent such as benzene. While mercaptan is consumed by addition to the polymer double bonds (nonmodifying reaction) in monomer-free polybutadiene latex containing persulfate, this addition reaction is virtually suppressed completely in the presence of butadiene monomer. On the basis of the accuracy of the determinations of mercaptan and monomer a slight activation of polymer molecules at high conversion with subsequent cross linking cannot be excluded.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1964.100021120
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