Determination of gel content of silane cross-linked polyethylene copolymers using FTIR technique
Publish place: Polyolefins Journal، Vol: 11، Issue: 1
Publish Year: 1403
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_POJ-11-1_001
تاریخ نمایه سازی: 7 اسفند 1402
Abstract:
Silane cross-linking of metallocene-based polyethylene-octene elastomer (POE)/linear low density polyethylene (LLDPE) blend was carried out using two-step Sioplas process in an industrial scale twin-screw extruder. In the study, grafting and cross-linking reactions of vinyl trimethoxy silane (VTMS) were analyzed using FTIR technique. It was found that the cured compound showed absorption peaks at ۱۰۷۸ cm-۱ and ۹۵۵ cm-۱ related to Si-O-Si bonds. A peak was also observed at ۳۴۰۵ cm-۱ of hydroxyl group produced from hydrolysis of methoxyethylene group during of curing process, reflecting that curing reaction was not completed. The samples were cured at different time intervals (۱۵ min-۱۶ hours). The gel content values determined by solvent extraction and FTIR were in good agreement at curing times more than ۴ hours. The efficiency of the silane grafting reaction was determined using the ratio of the absorption peak at ۱۰۹۲ cm-۱ characteristic of methoxy to the transmittance peak at ۱۳۷۸ cm-۱ characteristic of methyl group, which is considered as the internal standard. The results showed the highest efficiency of silane grafting reaction at ۵ w% of VTMS with the least amount of internal standard ratio (۰.۰۲۹), at which the lowest MFI value, and the highest values for gel content, tear strength, compression set and hot set ۲۰۰ °C were obtained.
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Authors
Mehri Dana
Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
Gholam Hossein Zohuri
Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
Navid Ramezanian
Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
Saeid Asadi Shahidi
Pouya Gostar Mfg. Co. of Part Lastic Group, Mashhad, Iran
Sohail Yazdanbakhsh
Pouya Gostar Mfg. Co. of Part Lastic Group, Mashhad, Iran
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