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首页> 外文期刊>Journal of Applied Polymer Science >Diffusion Coefficients of Polychlorinated Biphenyls and Polycyclic Aromatic Hydrocarbons in Polydimethylsiloxane and Low-Density Polylethylene Polymers
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Diffusion Coefficients of Polychlorinated Biphenyls and Polycyclic Aromatic Hydrocarbons in Polydimethylsiloxane and Low-Density Polylethylene Polymers

机译：多氯联苯和多环芳烃在聚二甲基硅氧烷和低密度聚乙烯聚合物中的扩散系数

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摘要

Diffusion coefficients (D) of polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) were determined by film-stacking technique in low-density polyethylene (LDPE) and two types of polydimethylsiloxane (PDMS) (also known as silicone rubber, SR) with the trade names AlteSil (TM) and Silastic. The estimated values of D for PCBs and PAHs over a wide range of hydrophobicity were 2-2.5 orders of magnitude lower in LDPE than in SR polymers. Log D (m(2) s(-1)) of PCBs ranged from -10.1 to -10.9 for SRs and from -12.4 to -13.7 for LDPE. For PAHs these ranges were -9.8 to -11.4 for SRs and -11.9 to -13.7 for LDPE. Compared with the D values calculated in water, D were 1-2 and 3-4 orders of magnitude lower in SR and LDPE, respectively. For PAH molecules, D was lower than for PCBs with a similar molecular weight, probably because of their more rigid structure. The range of log D for PCBs in SR was only 0.5 log units (factor of 3.2) versus 1.2 log units (factor of 16) in LDPE. Although compound classes showed different relations, a linear relation of D with total surface area was the most universal. This relation may be used for prediction of D values in SR and LDPE polymers for other organic compounds.
机译：通过膜堆叠技术在低密度聚乙烯（LDPE）和两种类型的聚二甲基硅氧烷（PDMS）（也称为硅橡胶，SR）中测定了多氯联苯（PCB）和多环芳烃（PAH）的扩散系数（D）商标名为AlteSil（TM）和Silastic。 LDPE的PCB和PAH的D估计值在LDPE中比SR聚合物低2-2.5个数量级。 PCB的Log D（m（2）s（-1））对于SR来说从-10.1到-10.9，对于LDPE则从-12.4到-13.7。对于PAH，SR的范围为-9.8至-11.4，而LDPE的范围为-11.9至-13.7。与水中计算的D值相比，SR和LDPE中的D分别低1-2和3-4个数量级。对于PAH分子，D比具有类似分子量的PCB低，这可能是由于其更坚硬的结构。 SR中PCB的log D范围仅为0.5 log单位（因数3.2），而LDPE中为1.2 log单位（因数16）。尽管化合物类别显示出不同的关系，但D与总表面积的线性关系最为普遍。该关系可用于预测其他有机化合物的SR和LDPE聚合物中的D值。

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