An aromatic polymer comprises divalent aromatic units linked through oxygen, characterised in that some at least of those units are or contain aromatic rings free of electron-withdrawing groups and in that at least one of such rings carries at least one nitrogen radical linked to a nuclear carbon atom by a nitrogen-carbon bond.
Preferably it consists to the extent of at least 75 mol percent by the repeating units:
O-Ph′-O-Ph-A-Ph I
alone or in combination with
O-Ph-A-Ph-O-Ph-A-Ph II
where Ph is paraphenylene;
Ph′ is phenylene, at least some of groups Ph′ carrying a nitrogen radical;
A is SO₂ or CO; and
the As can be the same or different in the polymer chain.
A process is provided which comprises nitrating a parent polymer and optionally reducing nitro groups to amino followed optionally by substitution of amino.
芳香族聚合物由通过氧连接的二价芳香族单元组成,其特征在于这些单元中至少有一些是或含有不含吸电子基团的芳香环,并且这些芳香环中至少有一个带有至少一个氮基,通过氮-碳键与核碳原子相连。
最好由至少 75 摩尔%的重复单元组成:
O-Ph′-O-Ph-A-Ph I
单独或与
O-Ph-A-Ph-O-Ph-A-Ph II
其中 Ph 为对苯二甲烯;
Ph′ 为亚苯基,至少部分基团 Ph′ 带有氮基;
A 是 SO₂ 或 CO;以及
As在聚合物链中可以相同,也可以不同。
提供了一种工艺,包括母体聚合物的硝化和选择性地将硝基还原为
氨基,然后选择性地进行
氨基取代。