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Effect of penta- and tetramethyl HALS on the radiation resistance of polypropylene

机译:五甲基和四甲基HALS对聚丙烯抗辐射性的影响

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摘要

2,2,6,6-Tetramethyl-4-piperidinyl methacrylate (TMPM), a new pentamethyl HALS 1,2,2,6,6-pentamethyl-4-piperidinyl methacrylate (PMPM), their homopolymers (PTMPM and PPMPM), and their copolymers, [i.e., TMPM or PMPM copolymerized with monomers methyl methacrylate (MMA), methacrylic acid (MMA), acrylic acid (AA), and styrene (St) separately] were synthesized. PMPM shows an extremely excellent stabilizing effectiveness on improving the radiation resistance of polypropylene (PP) in comparison with other low molecular weight (LMW) HALS or polymeric HALS. Polymeric HALS shows a much higher thermal stability and better extraction resistance than that of LMW HALS. It is found that the Eb values of the PP-added pentamethyl HALS series are higher than those of PP with the corresponding tetramethyl HALS series at a given irradiation dose. A conclusion can be drawn that the pentamethyl HALS series has a higher stabilizing effectiveness than that of the tetramethyl HALS series. (C) 1998 John Wiley & Sons, Inc. [References: 13]
机译:甲基丙烯酸2,2,6,6-四甲基-4-哌啶基酯(TMPM),新型五甲基HALS 1,2,2,6,6-五甲基-4-哌啶基甲基丙烯酸酯(PMPM),其均聚物(PTMPM和PPMPM),合成了它们的共聚物[即分别与甲基丙烯酸甲酯(MMA),甲基丙烯酸(MMA),丙烯酸(AA)和苯乙烯(St)单体共聚的TMPM或PMPM]。与其他低分子量(LMW)HALS或聚合物HALS相比,PMPM在改善聚丙烯(PP)的抗辐射性方面显示出极好的稳定效果。聚合HALS比LMW HALS具有更高的热稳定性和更好的抗萃取性。发现在给定的照射剂量下,添加PP的五甲基HALS系列的Eb值高于具有相应的四甲基HALS系列的PP的Eb值。可以得出的结论是,五甲基HALS系列比四甲基HALS系列具有更高的稳定效果。 (C)1998 John Wiley&Sons,Inc. [参考:13]

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