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首页> 外文期刊>Journal of Applied Polymer Science >Structural Determination of Ethylene-Propylene-Diene Rubber (EPDM) Containing High Degree of Controlled Long-Chain Branching
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Structural Determination of Ethylene-Propylene-Diene Rubber (EPDM) Containing High Degree of Controlled Long-Chain Branching

机译：高度受控长链支化的乙烯-丙烯-二烯橡胶（EPDM）的结构确定

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摘要

This work highlights an attempt to characterize the degree and nature of long-chain branching (LCB) in an unknown sample of ethylene-propylene-diene rubber (EPDM). Two EPDM rubbers selected for this study were comparable in comonomer compositions but significantly different with respect to molar mass and the presence of LCB. Both rubbers contained 5-ethylidene-2-norbornene (ENB) as diene. Solution cast films Of pure EPDM samples were used for different characterization techniques. H-1-NMR, and C-13-NMR were used for assessing the comonomer ratios and LCB. Size exclusion chromatography (SEC) equipped with triple detector system was used to determine the molar mass (both absolute and relative) and polydispersity index (PDI). Presence of branching was also detected using sec-viscometry. Rheological analysis has also been used for characterizing LCB. Finally, on the basis of the experimental findings and the available theories, an attempt was made to identify the chemical nature and degree of LCB. This study reveals the possibility of detailed characterization of molecular architecture of EPDM containing LCB by comparing with an essentially linear EPDM in light of an existing theory.
机译：这项工作突出了试图表征未知的乙丙丙烯二烯橡胶（EPDM）样品中长链支化（LCB）的程度和性质的尝试。选择用于本研究的两种EPDM橡胶的共聚单体组成相当，但摩尔质量和LCB的存在显着不同。两种橡胶均包含5-亚乙基-2-降冰片烯（ENB）作为二烯。纯EPDM样品的溶液流延膜用于不同的表征技术。使用H-1-NMR和C-13-NMR评估共聚单体比率和LCB。使用配备三重检测器系统的尺寸排阻色谱法（SEC）测定摩尔质量（绝对质量和相对质量）和多分散指数（PDI）。还使用sec-viscometry检测了分支的存在。流变分析也已用于表征LCB。最后，根据实验结果和可用的理论，尝试确定LCB的化学性质和程度。这项研究揭示了根据现有理论与基本线性的EPDM进行比较，可以详细表征包含LCB的EPDM分子结构的特征。

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