摘要 |
<p>Sulphur-contg. polyarylene resin is new, contg. sulphur atoms in the main chain (pref. as a polyphenylene sulphide) and in which the arylene gps. are at least 5% (12%) crosslinked (e.g. by ether linkages). Pref. at least 2% (molar) of the sulphur is in the form of sulphoxide or sulphone. Pref. sulphur-contg. polyarylene resin is heated with a cpd. (e.g. oxide) of a metal (pref. Fe, Co or Cr) to crosslink.</p> |