Formation of polybrominated dibenzofurans during extrusion of high-impact polystyrene/decabromodiphenyl ether/antimony(III) oxide
Formation of polybrominated dibenzofurans during extrusion of high-impact polystyrene/decabromodiphenyl ether/antimony(III) oxide
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高抗冲聚苯乙烯/十溴二苯醚/氧化锑(III)挤出过程中多溴二苯并呋喃的形成
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
L. Nelissen
中科院分区：
文献类型：
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作者：
R. Luijk;H. Govers;L. Nelissen
多溴二苯并呋喃（PBDF）是在高抗冲聚苯乙烯（I）挤出过程中形成的。阻燃体系十溴二苯醚（II）/Sb 2 O3。考察了PBDF的形成过程。在挤出温度下，275度。为了更好地了解挤出过程中聚合物熔体中发生的过程，还检查了I链的热稳定性。阻燃体系II/Sb_2O_3对热降解具有稳定作用。聚苯乙烯链。温度在计算机模型中模拟了I/II/Sb_2O_3在挤压过程中的发展，支持了热降解引发的PBDF形成机制。内燃我放弃了。产品，即，（聚）苯乙烯自由基，稳定的自由基清除性能的阻燃剂II。II的脱溴与形成PBDF的闭环反应相结合。多溴联苯醚在挤出过程中形成。聚合物如I.通过反相HPLC对I/II/Sb 2 O3中PBDF的产率进行的初步定量显示，在四个挤出循环后，七溴二苯并呋喃从1.5 ppm增加到9 ppm，八溴二苯并呋喃从4.5 ppm增加到45 ppm
Polybrominated dibenzofurans (PBDFs) are formed during extrusion of high-impact polystyrene (I) contg. the flame retardant system decabromodiphenyl ether(II)/Sb2O3. The process of formation of PBDFs was examd. at an extrusion temp. of 275 °. To get a better understanding of processes taking place in the polymer melt during extrusion, the thermal stability of I chains was also examd. The flame retardant system II/Sb2O3 showed a stabilizing activity toward thermal degrdn. of polystyrene chains. Temp. development during extrusion processing of I/II/Sb2O3, simulated in a computer model, supported a mechanism of formation of PBDFs which was initiated by thermal degrdn. of I. I degrdn. products, i.e., (poly)styrene radicals, were stabilized by radical scavenging properties of the flame retardant II. Debromination of II was combined with a ring-closure reaction forming PBDFs. PBDFs were formed during extrusion of polybrominated di-Ph ethers in addn. polymers such as I. A tentative quantification of the yield of PBDFs in I/II/Sb2O3 by reversed-phase HPLC showed an increase from 1.5 to 9 ppm for heptabromodibenzofuran and from 4.5 to 45 ppm for octabromodibenzofuran after four extrusion cycles