摘要
本文用稍过量４、４’－二氯苯酮合成的聚醚醚酮（ＰＥＥＫ）样品，利用ＵＶ、ＭＩ、ＤＳＣ和ＴＧＡ等研究本氧阴离子及其相对浓度在树脂合成和加工过程中对ＰＥＥＫ分子结构和性能的影响．结果表明：苯氧阴离子端基引起支化交联反应，且随着其相对浓度增加而增加．采用过量４、４’－二氯苯酮合成ＰＥＥＫ，不仅能控制产物的分子量，而且有利于抑制支化交联反应，提高ＰＥＥＫ的流动性和热稳定性．本文还初步探讨了ＰＥＥＫ支化反应机理和支化高分子热分解机理．
EEK has been synthesize by polycondensation of excess 4, 4'-diflu oro benzo phen o ne (DFBP) with hydroqulnone in diphenyl sulfo ne. B yusing UV, MI, TGA and DSC techniques, the effects of phenoxide groups andits relative concentration on the structure and propenies of PEEK during Synthsisand processing have been studied. The results showed that the phenoxide groupscould lead to branching and cross--linking, and this increased with its relativeconcentration. We can control the molecular weight of product by synthesidsgPEEK with excess DFBP,' it also helps to preventing side reactions such asbranching and crosslinking, and inproving the flow and thermal propenies ofPEEK. We also discuss in this paper the mechanism of the branching reactionand the mechanism of the thennal degtsdation of branched PEEK chain.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1994年第1期27-33,共7页
Acta Polymerica Sinica
基金
国家自然科学基金
关键词
聚醚醚酮
苯氧阴离子
分子结构
Structure of PEEK, Phenoxide ion, Flow property, Thermalproperty
