乙烯类单体自由基聚合的阻聚效应——Ⅻ.酰氨基硫脲及某些杂环衍生物对醋酸乙烯酯聚合的影响

INHIBITING EFFECTS ON THE RADICAL POLYMERIZATION OF VINYL MONOMERSⅫ.THE INHIBITING EFFECT OF ACYL THIOSEMICARBAZIDES AND SOME HETEROCYCLES ON POLYMERIZATION OF VAc

众所周知,酚类、胺类、醌类、硝基以及亚硝基化合物对烯类单体的自由基聚合有阻聚作用。一些杂原子化合物如RNHNHR′,RSR(RNHCSS)_2M等对烯类单体的自由基聚合也能产生阻聚。1,4-二取代酰氨基硫脲及与其相对应的杂环分子中也含—NHNH—,

The inhibition effects of five 1-isonicotinoyl-4-arylthiosemicarbazides and some 1,2,4-triazoline-5-thione derivatives on the polymerization of VAc, initiated by AIBN, have beeninvestigated by dilatometric method. The results showed that being added in the amountof 1000-3000ppm, the thiosemicarbazides have a more prominent inhibiting effect thantrizoline-5-thiones. When the compounds studied were incorporated with 1,4-benzoquinoneor hydroquinone the inhibiting effect increased strikingly.