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首页> 外文期刊>Journal of Applied Polymer Science >Polymerization of Styrene in the Presence of Polybutadiene:Determination of the Molecular Structure
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Polymerization of Styrene in the Presence of Polybutadiene:Determination of the Molecular Structure

机译：聚丁二烯存在下苯乙烯的聚合：分子结构的测定

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This work experimentally and theoretically determines the molecular macrostructure of the polymer mixture that is developed (at relatively low conversions) in a solution polymerization of styrene (St) in presence of polybutadiene (PB).The reaction was carried out at 70 deg C in a batch-stirred tank reactor.From samples taken along the reaction,the three polymeric components of high-impact polystyrene (HIPS) (i.e.,polystyrene-PS-,residual PB,and graft copolymer) were first separated from each other by solyent extraction.Then,the graft copolymer was ozonized to isolate the St branches.Th emolecular weight distributions (MWDs) of the total HIPS,the three HIPS components,and the grafted St branches were determined by the size exclusion chromatography (SEC).For the graft copolymer and the total HIPS,the variation of the St mass fraction with molecular weights was also determined by SEC.All measurements were compared with theoretical estimates,and a reasonable agreement is observed.For the theoretical estimates,the mathematical model of Estenoz,D.A.;Valdez,E.;Oliva,H.M.;Meira,G.R.(J Polym Sci 1996,59,861) was extended to compare the MWD of the St branches with the MWD of the free PS.For the sought experimental conditions,these two distributins had very similar results but in a bulk industrial process,larger discrepancies are to b expected.
机译：这项工作是从实验和理论上确定了在聚丁二烯（PB）存在下在苯乙烯（St）的溶液聚合中发展（相对较低的转化率）的聚合物混合物的分子宏观结构。从反应过程中抽取的样品中，首先通过溶剂萃取将高抗冲聚苯乙烯（HIPS）的三种聚合物组分（即聚苯乙烯-PS-，残余PB和接枝共聚物）彼此分离。然后，将接枝共聚物进行臭氧处理以分离出St支链。通过尺寸排阻色谱法（SEC）确定总HIPS，三种HIPS组分和接枝的St支的分子量分布（MWD）。通过SEC测定了总的HIPS和St质量分数随分子量的变化。将所有测量值与理论估计值进行比较，观察到合理的一致性。理论上的估计，扩展了Estenoz，DA; Valdez，E。; Oliva，HM; Meira，GR（J Polym Sci 1996,59,861）的数学模型，以比较St分支的MWD与免费PS的MWD。在所寻求的实验条件下，这两种分布具有非常相似的结果，但是在批量工业过程中，预期会有更大的差异。

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