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In the present paper a model equation for calculating the radical desorption rate constant,k_0,in the emulsion polymerization of vinyl acetate was suggested and the various parameters forevaluating k_0 were determined.Effects of reaction temperature,emulsifier concentration,initiator con-centration,monomer conversion and phase ratio on k_0 were studied.It indicates that the desorptionof radicals from latex particles to aqueous phase must be taken into account in the modelling ofemulsion polymerization for the monomers with higher hydrophilicity such as vinyl acetate. 相似文献
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不同助交联剂在HNBR中的应用 总被引:5,自引:0,他引:5
对比研究了HVA 2 ,TAIC和 1,2 PB助交联剂在HNBR过氧化物硫化中的硫化特性和硫化胶性能 ,结果表明 :随着HVA 2用量增加 ,最高弹性扭力矩MH迅速增加 ,而TAIC和 1,2 PB比较缓慢 ;当HVA 2用量为 4份时 ,t90 最短 ,约 6min ,低于TAIC和 1,2 PB的 12min左右 ,超过 4份用量 ,t90 又延长 ,而TAIC和 1,2 PB的t90 则缓慢增加 ;助剂联剂HVA -2 ,TAIC和 1,2 PB用量均为 2 5份时 ,硫化胶的拉断伸长率分别为178% ,2 12 %和 2 2 8% ,均低于空白样的 2 75 % ,硬度相应增加 2~ 4个单位 ,但压缩永久变形 (A法 ,15 0℃×72h)改善 ,分别为 2 4 3 % ,2 0 7%和 19 8% ,明显低于空白样的 3 6%。 相似文献
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