摘要
按照GB/T 40006.1—2021的要求对试样进行前处理后用电子鼻技术进行气味测定,通过仪器自带的数据处理软件对传感器响应信号进行主成分分析(PCA)处理,将复杂的数据转化为直观的PCA图,建立适用于再生聚碳酸酯(PC)塑料气味分析模型,利用红外光谱分析、热重分析和静态顶空-气相色谱-质谱分析对形成这些气味的原因进行了剖析,进一步验证电子鼻技术的分析结果。结果表明,电子鼻数据采集时间120 s,可获得各个传感器对再生PC塑料气味响应的最高值。将每种样品的每个传感器的响应最高值取出绘制成气味指纹图,可直观地看到W1S(对甲基类灵敏)、W1W(对硫化物灵敏)、W2S(对醇类、醛酮类灵敏)三个传感器对再生PC塑料气味的响应值是三级>二级>一级,其他传感器的最大响应值基本重合。PCA模型可很好的区分不同再生PC塑料试样的气味响应值之间的差异,还可以用于辨别气味大小。结合红外光谱分析、热重分析和静态顶空-气相色谱-质谱分析,再生PC塑料主气味要由添加剂降解,PC中异亚丙基链断裂、碳酸酯键水解/醇解及重排交联反应等产物带来。
According to the requirements of GB/T 40006.1—2021,the sample was pretreated and then using the electronic nose technology to determine the odor.The sensor response signal was processed by principal component analys(PCA)through the data processing software of the instrument.The complex data was converted into an intuitive PCA diagram,and an odor analysis model suitable for recycled polycarbonate(PC)plastics was established.The causes of these odors were analyzed by infrared spectrum analysis,thermogravimetric analysis and static headspace-gas chromatography-mass spectrometry,further it verified the analysis results of electronic nose technology.The results show that the data acquisition time of the electronic nose is 120 s,and the highest value of each sensor s response to the odor of recycled PC plastic could be obtained.Taking out the highest response value of each sensor of each sample and an odor fingerprint could be drawn.It can be seen intuitively that the response values of W1S(sensitive to methyl),W1W(sensitive to sulfide)and W2S(sensitive to alcohols,aldehydes and ketones)to the odor of recycled PC plastic are Level 3>Level 2>Level 1,and the maximum response values of other sensors basically coincide.The PCA model can well distinguish the difference between the odor response values of different recycled PC plastic samples,and can also be used to identify the odor size.Combined with infrared spectrum analysis,thermogravimetric analysis and static headspace-gas chromatography-mass spectrometry,the main odor of regenerated PC plastic should be brought by the degradation products,such as,additive degradation,isopropylidene chain breaking,hydrolysis/alcoholysis of carbonate bond and rearrangement crosslinking reaction.
作者
余巧玲
陈宏愿
陈伟力
王万卷
何国山
李晓增
叶元坚
梁森涛
YU Qiaoling;CHEN Hongyuan;CHEN Weili;WANG Wanjuan;HE Guoshan;LI Xiaozeng;YE Yuanjian;LIANG Sentao(Guangzhou Quality Supervision and Testing Institute,Guangzhou 511447,China;Beijing C-Plast Chenguang Technology Co.,Ltd.,Beijing 102401,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2023年第5期102-108,共7页
China Plastics Industry
基金
广州市市场监督管理局科技项目(2021kj03)。
关键词
电子鼻技术
再生聚碳酸酯塑料
气味分析模型
红外光谱分析
热重分析
静态顶空-气相色谱-质谱分析
Electronic Nose Technology
Recycled Polycarbonate Plastic
Odor Analysis Model
Infrared Spectrum Analysis
Thermogravimetric Analysis
Static Headspace-gas Chromatography-mass Spectrometry
