| 摘要 |
A process is disclosed for converting alpha , omega -bis(2,6-dimethylphenol)poly(2,6-dimethyl-1,4-phenylene oxide) ("PPO-2OH" for brevity), and the corresponding thiophenol-poly(phenylene sulfide) ("PPS-2SH"), by the oxidative copolymerization of 2,6-dimethylphenol (DMP) with 2,2'-di)4-hydroxy-3,5-dimethylphenyl propane ("TMBPA"), or, of 2,6-dimethylthiophenol (DMTP) with 2,2-di(4-thiol-3,5-dimethylthiophenyl propane ("TMBTPA") respectively. Specifically, a mixture of water-methanol or chlorobenzene-methanol is used as the medium in which the reaction of DMP with TMBPA is carried out. By using a particular range of ratios of DMP to TMBPA and different solvent mixtures, the molecular weight of the PPO-2OH is tailored to be in the range from about 1000 to about 5000. The PPO-2OH is then difunctionalized at its chain ends, so that in the first instance, there is provided a reactive double bond (for example, a vinylbenzyl group) at each end of the PPO-2OH; and, in the second instance, a triple bond (benzylethynyl group) at each end of the PPO-2OH. The thermal polymerization of the PPO-2VB has exceptionally desirable characteristics. The corresponding PPS-2VB is also crosslinkable and has high reactivity, but has quite different characteristics.
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