Thermal oxidation of poly(ethylene oxide-propylene oxide-ethylene oxide) triblock copolymer: focus on low molecular weight degradation products

被引:30
作者
Gallet, G
Erlandsson, B
Albertsson, AC
Karlsson, S [1 ]
机构
[1] Royal Inst Technol, Dept Polymer Technol, SE-10044 Stockholm, Sweden
[2] AstraZeneca R&D Sodertalje, PAR&D, Prod Anal, SE-15185 Sodertalje, Sweden
关键词
thermal oxidation; triblock copolymer; poloxamer; SPME/GC-MS;
D O I
10.1016/S0141-3910(02)00079-4
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The oxidative thermal degradation of poloxamer 407, a poly(ethylene oxide-propylene oxide-ethylene oxide) triblock copolymer, at 50 and 80 degreesC in air was studied by solid phase microextraction/gas chromatography-mass spectrometry (SPME/GC-MS). At 80 degreesC, we found that degradation was initiated on the PPO block of the copolymer by three mechanisms involving hydroperoxyl formation and depropagation. 1,2-propanediol,1-acetate; 1,2-propanediol,2-formate; 1, 2-propanediol,1-acetate, 2-formate and 2-propanone,1-hydroxy were the first degradation products produced. Random chain scissions and a sharp decrease in the molecular weight of the material followed the initiation period. Formic acid and acetic acid, formed upon degradation, participated in esterification reactions leading to the formation of the formate and acetate forms of 1,2-propanediol and ethanediol. Though degradation at 50 degreesC was much slower, the oxidative mechanisms leading to low molecular weight formates and acetates were the same as those observed at 80 degreesC. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:55 / 66
页数:12
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