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首页> 外文期刊>Journal of Applied Polymer Science >PFG-NMR measurement of self-diffusion coefficients of long-chain -olefins and their mixtures in semi-crystalline polyethylene
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PFG-NMR measurement of self-diffusion coefficients of long-chain -olefins and their mixtures in semi-crystalline polyethylene

机译：PFG-NMR测量长链烯烃及其混合物在半结晶聚乙烯中的自扩散系数

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摘要

The self-diffusion coefficients of C6-C16 long-chain -olefins and their mixtures in semi-crystalline polyethylene were measured through the pulsed field gradient nuclear magnetic resonance (PFG-NMR). The effects of chain length, polyethylene (PE) type, and co-monomer type in PE on the diffusion coefficients were investigated. Moreover, the influence of halohydrocarbon, cycloalkanes, and arene solvents on the diffusion coefficients of C12 -olefin in PE was characterized. The results have demonstrated that the diffusion coefficient of the single-component -olefin in PE decreases exponentially with the increase of the carbon number of -olefin, and the crystallinity and crystal morphology of PE play a more important role than the co-monomer type in determining the diffusion coefficients of -olefins. In addition, the apparent diffusion coefficients were used to represent the diffusion behaviors of the -olefin mixtures in PE. Owing to the presence of other hydrocarbon solvents, namely trichloromethane, cyclohexane, and benzene, the diffusion coefficients of C12 long-chain -olefin in PE are significantly enhanced, and such promoting effect of the hydrocarbon solvents in polyolefin elastomer (POE) is much stronger than those in high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE). (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44143.
机译：通过脉冲场梯度核磁共振（PFG-NMR）测量了C6-C16长链烯烃及其在半结晶聚乙烯中的混合物的自扩散系数。研究了PE中链长，聚乙烯（PE）类型和共聚单体类型对扩散系数的影响。此外，表征了卤代烃，环烷烃和芳烃溶剂对C12-烯烃在PE中的扩散系数的影响。结果表明，单组分烯烃在聚乙烯中的扩散系数随烯烃碳原子数的增加而呈指数下降，且聚乙烯的结晶度和结晶形态比共聚单体类型更重要。确定-烯烃的扩散系数。另外，使用表观扩散系数来表示-烯烃混合物在PE中的扩散行为。由于存在其他碳氢溶剂，即三氯甲烷，环己烷和苯，因此，C12长链烯烃在PE中的扩散系数显着提高，并且这种碳氢溶剂在聚烯烃弹性体（POE）中的促进作用更强高于高密度聚乙烯（HDPE）和线性低密度聚乙烯（LLDPE）中的那些。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，44143。

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