| 摘要 |
PURPOSE:To obtain PPS with such enhanced melt viscosity as to be moldable without brown discoloration, by heating the original PPS in an organic amide in the presence of metallic Mg. CONSTITUTION:The objective polyphenylene sulfide (PPS) can be obtained by heating PPS with structural unit of formula, in an organic amide, in the presence of 0.01-5.0 (pref. 0.05-1.0) wt%, based on the PPS of metallic magnesium, at >=200 deg.C esp. 220-280 deg.C. The original PPS is such as to contain >=70 (pref. >=90) mol% of the unit of the formula. Said organic amide is pref. N- methyl-2-pyrrolidone.
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