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The Fate of the Peroxyl Radical in Autoxidation: How Does Polymer Degradation Really Occur?
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2018-07-17 00:00:00 , DOI: 10.1021/acs.accounts.8b00250
Leesa M. Smith 1 , Heather M. Aitken 1 , Michelle L. Coote 1
Affiliation  

Bolland and Gee’s basic autoxidation scheme (BAS) for lipids and rubbers has long been accepted as a general scheme for the autoxidation of all polymers. This scheme describes a chain process of initiation, propagation, and termination to describe the degradation of polymers in the presence of O2. Central to this scheme is the conjecture that propagation of damage to the next polymer chain occurs via hydrogen atom transfer with a peroxyl radical. However, this reaction is strongly thermodynamically disfavored for all but unsaturated polymers, where the product allylic radical is resonance-stabilized. Paradoxically, there is no denying that the autocatalytic degradation and oxidation of saturated polymers still occurs. Critical analysis of the literature, described herein, has begun to unravel this mystery.

中文翻译:

自动氧化过程中过氧自由基的命运:聚合物降解是如何发生的?

长期以来,Bolland和Gee对于脂​​质和橡胶的基本自氧化方案(BAS)已被接受为所有聚合物自氧化的一般方案。该方案描述了引发,传播和终止的链式过程,以描述在O 2存在下聚合物的降解。该方案的核心是推测损害的传播是通过氢原子与过氧自由基的转移而传播到下一个聚合物链上的。但是,该反应对于除不饱和聚合物以外的所有聚合物均在热力学上是不利的,其中产物烯丙基自由基是共振稳定的。矛盾的是,无可否认,饱和聚合物仍会发生自催化降解和氧化。本文所述的对文献的批判分析已经开始揭开这个谜团。
更新日期:2018-07-17
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