对-叔丁基杯[4]芳烃对聚丙烯γ辐射降解的稳定化效应

THE EFFECT OF pTERTBUTYLCALIXARENE ON RADIATION DEGRADIATION OF POLYPROPYLENE

研究了在室温下，真空或空气条件下γ射线对添加对叔丁基杯［４］芳烃（ＣＡ［４］）的聚丙烯的辐射效应，同时与加有２，６二叔丁基对甲酚（ＢＨＴ）和未加添加剂的聚丙烯对照。由辐照前后聚合物的力学性能、热性质及红外光谱的变化表明，在辐照过程中和辐照后，ＣＡ［４］对聚丙烯都具有稳定化作用，剂量较高时，稳定化效果更为显著。此外，ＥＳＲ实验证实，ＣＡ［４］分子在辐照下产生稳定自由基。在剂量率６５×１０３Ｇｙ／ｈ，剂量１０００ｋＧｙ，未检测到ＣＡ［４］的分解碎片，表明杯环具有较高的抗辐射稳定性。

Polypropylene(PP) containing cyclic phenolic antioxidant, ptertbutylcalix arene as additive was irradiated with γray in air or in vacuum at ambient temperature The mechanical properties, variation of IR spectra and decomposition temperature by thermal analysis were mearsured for the irradiated PP sheets Compared with BHT, ptertbutylcalixarene showed radiation stabilization towards PP during and after irradiation, especially at a high dose By means of ESR spectra and other spectra the formation of the stable calixarene radical was confirmed No decomposition species of the calixarene was observed with the dose≤1000 kGy and the dose rate of 65×103kGy/h indicating the higher radiationresistance of the calixarene structure