高密度聚乙烯电子束辐射交联的研究

Crosslinking of high density polyethylene under electron beam radiation

用高能电子束辐射技术研究了添加敏化剂季戊四醇三丙烯酸酯(PETA)和抗氧剂300的高密度聚乙烯(HDPE)体系的辐射交联效应。通过测定试样辐射后交联度、拉伸强度、直角撕裂强度等性能,考察了辐射剂量、w(PETA)和w(300)对HDPE辐射交联的影响;并用差示扫描量热法和热重分析研究了HDPE辐射后的结晶性和热稳定性。PETA和辐射剂量对提高HDPE辐射交联度起关键作用。在PETA作用下,13 kGy的低辐射剂量可使HDPE的交联度达63%。

The authors studied the radiation crosslinking of high density polyethylene（HDPE） containing sensitizer pentaerythritol triacrylate （PETA） and antioxidant 4,4＇ - thiobis （6- tert- butyl- m- cresol） under high energy electron beam. The influences of radiation dose and mass contents of the sensitizer and antioxidant on the crosslinked HDPE were determined through testing crosslinking degree, tensile strength and tangential breaking strength of the samples. The crystallizability and heat stability of the crosslinked HDPE was analyzed by differential scanning calorimetry（DSC） and thermogravimetry（TG）. PETA and radiation dose played key roles in increasing the crosslinking degree of HDPE, which could reach 63% with a rather low radiation dose like 13 kGy under the action of PETA.