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首页> 外文期刊>Journal of Applied Polymer Science >HIGH-MELT-STRENGTH POLYPROPYLENE WITH ELECTRON BEAM IRRADIATION IN THE PRESENCE OF POLYFUNCTIONAL MONOMERS
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HIGH-MELT-STRENGTH POLYPROPYLENE WITH ELECTRON BEAM IRRADIATION IN THE PRESENCE OF POLYFUNCTIONAL MONOMERS

机译：存在功能单体时具有电子束辐照的高熔体强度聚丙烯

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摘要

High-melt-strength polypropylene (PP) was achieved with irradiation by an electron beam generated from an accelerator in the presence of polyfunctional monomers (PFM). Among 16 PFMs, the relatively shorter molecular chain bifunctional monomers such as 1,4-butanediol diacrylate (BDDA) and 1,6-hexanediol diacrylate (HDDA) were the most effective for enhancing the melt strength of PP. The concentration and dose of the HDDA to obtain the high melt strength PP in irradiation under nitrogen gas atmosphere were 1.5 mmol/100 g PP and 1 kGy, respectively. DSC measurement and dynamic mechanical analysis showed that the thermal behavior of the high-melt-strength PP was different from that of the original PP. Crystallinity and crystallization temperature during cooling after heating were lower and higher in high melt strength PP than original PP, respectively. Elongational viscosity at 180 degrees C of the high-melt-strength PP showed a remarkable increase at a certain elongational time with constant strain rate, demonstrating the typical property of high-melt-strength samples. This implies that a few higher molecular chains of PP, formed by intermolecular combination of its chain by HDDA in irradiation, give higher melt strength to induce entanglement of molecular chains. (C) 1996 John Wiley & Sons, Inc. [References: 15]
机译：在多官能单体（PFM）的存在下，通过由促进剂产生的电子束辐照获得高熔体强度聚丙烯（PP）。在16种PFM中，相对较短的分子链双官能单体，例如1,4-丁二醇二丙烯酸酯（BDDA）和1,6-己二醇二丙烯酸酯（HDDA）对提高PP的熔体强度最为有效。在氮气气氛下辐照以获得高熔体强度PP的HDDA的浓度和剂量分别为1.5mmol / 100g PP和1kGy。 DSC测量和动态力学分析表明，高熔体强度PP的热行为不同于原始PP。高熔体强度PP的加热后冷却过程中的结晶度和结晶温度分别低于原始PP。高熔体强度PP在180℃的拉伸粘度在一定的伸长率下以恒定的应变速率表现出明显的增加，这证明了高熔体强度样品的典型性能。这意味着在HDDA辐照下，PP的分子间结合形成的一些较高的PP分子链具有较高的熔体强度，可诱导分子链缠结。 （C）1996 John Wiley＆Sons，Inc. [参考：15]

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