Abstract: Based on the three⁃step production process of anion polymerization between styrene and butadiene, a three⁃step model of SBS polymerization process was established using Polymer Plus, to analyze the sensitivity of the raw materials including styrene and butadiene, the catalyst (butyl lithium) and chain transfer agent (tetrahydrofuran,THF) , as well as the impact of the input amount on the molecular weight, polydispersity index (PDI), and yield of the SBS product, guiding further actual production process. The results indicated that purifying the monomers and increasing the input amount for styrene and butadiene can improve the polymerization degree and molecular weight of the product. Besides of that, increasing of the input amount of styrene could decrease the the PDI value. The catalyst had a significant effect on the properties of the product. Thus, the input amount of butyl lithium must be strictly controlled in actual production process. Different from catalyst, chain transfer agent (THF) had a slight influence on the properties of the product and could be used to adjust the molecular weight and degree of polymerization of the product on a small scale without affecting the production yield.

Key words: Polymer Plus, Simulation, SBS, Polymerization, Sensitivity

摘要： 以苯乙烯和丁二烯阴离子聚合的三步进料法生产工艺为基础，运用Polymer Plus建立SBS（苯乙烯⁃丁二烯⁃苯乙烯嵌段共聚物）聚合过程的三步进料法模型，利用建立的模型对原料单体苯乙烯、丁二烯，催化剂丁基锂，链转移剂四氢呋喃进行敏感性分析，探究其进料量对SBS产品相对分子质量、聚合物多分散指数以及产量的影响，进而对实际工业生产提出建议。分析结果表明，为了提高产品的聚合度和相对分子质量，应尽量纯化单体，苯乙烯和丁二烯进料量的增加可以提高产品相对分子质量和聚合度，同时增加苯乙烯的进料量还可以降低多分散指数。催化剂可以有效地改变产品的性质，在实际生产中必须严格控制丁基锂的进料量。链转移剂四氢呋喃对产品性质略有影响，可以在不影响产量的基础上小范围调节产品的相对分子质量和聚合度。

关键词: Polymer Plus, 模拟, SBS, 聚合, 敏感性