摘要
利用亲核取代反应, 通过缩聚法合成了一种新型聚芳醚酮50%交替共聚物PEDEK-PETMDEK, 通过 1H NMR证明其具有预期的结构.通过考察50%无规共聚物、 50%交替共聚物、均聚物PEDEK和PETMDEK的溶解性和热性能, 发现聚醚醚酮共聚物的链段连接方式对聚合物性能有很大影响.50%交替共聚物是一种无定形固体, 易溶于通常的有机溶剂, 而50%无规共聚物却是半结晶聚合物, 除浓硫酸外几乎不溶于任何溶剂; 50%交替共聚物具有比50%无规共聚物更高的玻璃化转变温度.
A novel alternate copolymer of poly (ether ether ketone), 50% PEDEK-PETMDEK was designed and synthesized successfully by aromatic nucleophilic substitution polycondensation. The structure of the alternate copolymer was determined by 1H NMR. The properties of the 50% alternate copolymer, 50% random copolymer, homopolymer PEDEK and PETMDEK were studied by DSC and WAXD etc.. We found that solubilities and thermal properties of 50% alternate copolymer and 50% random copolymer were quite different, the former is amorphous, and could be easily dissolved in common organic solvents,
while the latter is a semi-crystalline polymer and could not be dissolved in almost any solvents except con-centrated H2SO4 just like the homopolymer PEDEK. The properties of 50% alternate copolymer are more like those of the homopolymer PETMDEK. The glass transition temperature of the 50% alternate copolymer is higher than that of the 50% random copolymer.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第9期1691-1694,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20104003)
吉林大学青年基金
