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醒目金蟲 (小有名氣)
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[求助]
Antioxidant behavior of a novel sulfur-bearing hindered pheno lic antioxidant
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abstract A novel sulfur-bear ing hindered pheno lic antioxidant with a mole cular weight of 130 5.9 (SAO) was success fully sy nthesiz ed via thiol-a crylate M ichael addi tion reaction and its str ucture was clari fi ed by nuclear magnetic resonance (N MR) and fou rier t ransform in frared spectra (FTIR). The short- term oxidat ion induc tion tim e (OIT) of polypropylene (P P) compo unds obtai ned at 210C showed that the OIT value of SAO-con tainin g PP was higher than that of PP using Chinox 1035 wit h a molecul ar weight of 6 42.9 as a stabil izer. Long-term accelerated thermal aging test of PP compou nds in an air oven at 150C, however, exhib ited that the aging resistance of SAO-stabili zing PP was in ferior to that of 1035-containin g PP, quite contrary to their respective short-term effec t on PP sta bilization . The pos sible reasons of this contradiction were discu ssed from t he viewpoint of the antioxidan ts ’ molecul ar struc ture and the lim-itati ons of the OI T approach in lifetim e prediction |
版主 (文壇精英)
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摘要 一種分子量為1305.9(SAO)的新型含硫受阻酚抗氧劑通過硫醇 - 丙烯酸酯的邁克爾加成反應(yīng)成功地合成,其結(jié)構(gòu)已通過核磁共振(N MR)和傅里葉變換紅外光譜(FTIR)分析清楚。210℃得到的聚丙烯(PP)化合物短期氧化誘導(dǎo)時間(OIT)表明含聚丙烯的SAO OIT值高于使用分子量為642.9的Chinox1035作為穩(wěn)定劑合成的聚丙烯。然而,150℃在空氣烘箱中i聚丙烯化合物長期加速的熱老化試驗(yàn)表明SAO作為穩(wěn)定劑合成聚丙烯的抗老化性能不如含Chinox1035聚丙烯,與短期穩(wěn)定效應(yīng)相反。這個矛盾的原因從抗氧化劑分子結(jié)構(gòu)的觀點(diǎn)和OIT方法的壽命預(yù)測變化局限性方面進(jìn)行了討論。 |

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