Study of Gamma Irradiation Effect on Unplasticized PVC by Positron Annihilation

Study of Gamma Irradiation Effect on Unplasticized PVC by Positron Annihilation
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正电子湮灭伽马射线对未塑化PVC的影响研究

DOI:
10.4028/www.scientific.net/ddf.373.274
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发表时间:
2017-03
影响因子:
--
通讯作者:
于润升
于润升
中科院分区:
--
文献类型:
--
作者:
王宝义;杨静;曹兴忠;魏龙;于润升

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用正电子湮没技术研究了未增塑聚氯乙烯(UPVC)的伽马辐照效应。正电子湮没寿命谱(PALS)结果表明,随着辐照剂量的增加,o-Ps寿命和强度均减小。通过比较四种典型聚合物在不同参考样品下的符合多普勒展宽(CDB)结果,证实CDB比曲线能真实地反映正电子湮没时电子的动量差。用未辐照的UPVC而不是常用的LDPE作为参比样品,对辐照UPVC的CDB结果显示明显的氧峰,与FTIR结果一起,验证了自由体积附近有羰基的出现。
Positron annihilation technique is used to study the gamma irradiation effect on unplasticized PVC (UPVC). Positron annihilation lifetime spectroscopy (PALS) results show that both the o-Ps lifetime and intensity decrease with the increase of gamma irradiation dose. By comparing Coincidence Doppler Broadening (CDB) results of four typical polymers using different reference sample, it is confirmed that CDB ratio curve can truthfully reflect the momentum difference of electrons which positrons annihilate with. The CDB results of gamma-irradiated UPVC using non-irradiated UPVC rather than commonly chosen LDPE as a reference sample show obvious oxygen peak, together with FTIR results, verify the appearance of carbonyl groups around the free volume.
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