Scission Efficiencies of Short Chain Branches in the YRadiolysis of Ethylene-a-Olef in Copolymers

Ho S.-Y., O'Donnell J.H., O' Sullivan P.W. and Bowmer T.N. (1984) Scission Efficiencies of Short Chain Branches in the YRadiolysis of Ethylene-a-Olef in Copolymers. Journal of Macromolecular Science: Part A - Chemistry, 21 6-7: 745-756. doi:10.1080/00222338408077238


Author Ho S.-Y.
O'Donnell J.H.
O' Sullivan P.W.
Bowmer T.N.
Title Scission Efficiencies of Short Chain Branches in the YRadiolysis of Ethylene-a-Olef in Copolymers
Journal name Journal of Macromolecular Science: Part A - Chemistry
ISSN 0022-233X
Publication date 1984-01-01
Sub-type Article (original research)
DOI 10.1080/00222338408077238
Volume 21
Issue 6-7
Start page 745
End page 756
Total pages 12
Language eng
Subject 2503 Ceramics and Composites
1600 Chemistry
2507 Polymers and Plastics
2505 Materials Chemistry
Abstract y -Irradiation of copolymers of ethylene with propene, 1-butene, and 1-hexene, containing from 1 to 6 alkyl short chain branches per 1000 carbon atoms, at 25ºC in vacuum, produced small amounts of n-alkanes with a maximum yield for the alkane corresponding to the alkyl branch of the a-olefin unit. A multilinear regression analysis showed a highly significant dependence of G(Cn alkane) on the frequency of alkyl branches containing n carbon atoms, determined by lS C-NMR. The corrections to the G ( Cn alkane) yields from other fragmentation processes were substantial but no dependence for G(Cn alkane) on fragmentation of chain ends or fragmentation of the chain following branch elimination could be deduced from the data. The scission efficiencies = G( alkane) divided by the branch frequency per 1000 carbon atoms f 95% confidence limits were (0.7 i 0.7) X (2.7 f 0.8) X lo-', and ( 1.5 i 0.3) X lo-', for methyl, ethyl, and butyl branches, respectively. These factors can be used to determine the short-chain branch frequencies in similar polymers from n-alkane yields on y-irradiation.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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