^(60)Co-γ辐照PET/PE复合膜中辐照产物及气味物质分析  

Analysis of Radiolysis Products and Odour Substance in PET/PE Composite Package Irradiated by ^(60)Co-γRadiation

作　　者：罗任杰 杨青华 林勤保[1] 蓝碧锋 颜建伟 李忠 LUO Renjie;YANG Qinghua;LIN Qinbao;LAN Bifeng;YAN Jianwei;LI Zhong(Packaging Engineering Institute,Jinan University,Zhuhai,Guangdong 519070,China;Guangzhou Radian High Energy Technology Co.,Ltd.,Guangzhou,Guangdong 511458,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang,Jiangxi 330052,China;Chemical Analysis Laboratory of Gongbei Customs Technology Center,Zhuhai,Guangdong 519015,China)

机构地区：[1]暨南大学包装工程研究所,广东珠海519070 [2]广州辐锐高能技术有限公司,广东广州511458 [3]华东交通大学土木建筑学院,江西南昌330052 [4]拱北海关技术中心化学分析实验室,广东珠海519015

出　　处：《塑料》2022年第3期45-49,共5页Plastics

基　　金：国家重点研发计划(2018YFC1603204,2018YFC1603206);珠海进出口公共技术服务平台产学研协同创新计划(IETP202001006);国家自然科学基金优青培育项目(20202ZDB01001)。

摘　　要：采用气相色谱-质谱法和顶空-气相色谱-质谱法分析^(60)Co-γ辐照对PET/PE复合膜中产物及气味物质的影响。将不同辐照剂量处理的PET/PE复合膜裁剪为碎片状,采用乙酸乙酯超声提取2 h后,进行GC-MS筛查,并结合谱库、保留指数以及标准品进行鉴别定性。结果表明,在20和50 kGy的^(60)Co-γ辐照下,PET/PE复合膜产生1,3-二叔丁基苯,而其生成量与辐照强度具有一定的正相关性。利用HS-GC-MS对辐照产生的刺激性异味进行分析。选择低、中、高3种气味强度的复合膜样品分别进行测试,并对结果中的13种挥发性物质的响应与气味强度的关系进行讨论。结果表明,仅有1,3-二叔丁基苯和2,4-二叔丁基苯酚的浓度响应与辐照后的异味强度呈正相关性,证明2种物质为疑似气味来源。通过与标准品的气味进行比较,确定2,4-二叔丁基苯酚为刺激性异味的主要来源。The gas chromatography-mass spectrometry(GC-MS),headspace gas chromatography-mass spectrometry(HS-GC-MS)were applied to study the effects of ^(60)Co-γradiolysis on products in PET/PE composite package and odour released.The PET/PE composite films processed by different irradiation doses were cut into small pieces and ultrasonically extracted with ethyl acetate for 2 h.Besides,analyses were conducted with GC-MS,and spectral library,retention time as well as standard substances were used to confirm unknown substances.The results showed that the breaking of chemical bond C—OH was triggered by ^(60)Co-γirradiation,leading to the generation of such irradiated products as 1,3-ditert-butyl benzene,and the amounts were positively associated with the irradiation intensity.The irritating odor released after irradiation was analyzed using HS-GC-MS.Samples with low,medium and high level of odor intensity were taken for tests,and the relationship between the response of the thirteen volatile substances and the odor intensity was discussed.According to the results obtained,only the concentration response of 1,3-ditert-butyl benzene and 2,4-ditert-butyl phenol was positively associated with the odor intensity after irradiation,so they could be identified as the suspected odor.Compared with the smell of the standard products,2,4-ditert-butyl phenol was finally determined as the main source of irritating odor in this study.

关 键 词：Γ辐照 塑料复合包装 塑料添加剂 2 4-二叔丁基苯酚 1 3-二叔丁基苯 顶空-气相色谱-质谱法 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] TQ323.41