Chain scission of polyethylene

Shultz, A. R., Leahy, S. M., Random Chain Scission of Polyethylene... 

Chain scissioning of polyethylene via the alkoxy radical would yield a terminal aldehyde and shorter-chain polyethylene free radical. 

In the excess of oxygen, in sar, definitely lower radiation yield of chain scissions of polyethylene was observed vriien cmnpared with oxygen consumed [47]. G for scission of low density polyethylene reached the value 4.1, while G for oxygen consumption was 9.6. 

Block copolymers of polyethylene and ethylcellulose have also been prepared by Vasiliu-Oprea and Simionescu using a Brabender Plastograph [133]. The influence of polymer ratio and reaction temperature has been investigated as was the changes in polyethylene properties (mechanical, electrical, thermal, and solubility). The reaction mechanism follows. Chain scission of polyethylene leads to... 

Vinyl and carbonyl groups are the functions most likely to occur as the result of chain scission of polyethylene in air. Both are readily detectable by infrared spectroscopy, using the characteristic frequencies [12] listed in Table 5.1. In the case of the carbonyl group, it is now well established that the observed peak in the thermally or photochemically oxidised polyethylene is a composite band, probably containing three components specific for the saturated aldehydic, ketonic and carboxylic groups [13]. There is also evidence that the first of these is the least abundant [14,15]. There is a readily detectable shoulder near 1740 cm and this has been assigned to ester groups [13]. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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