首页   按字顺浏览 期刊浏览 卷期浏览 Thermal Degradation of Polymers. III: Mass Spectrometric Thermal Analysis of Condensati...
Thermal Degradation of Polymers. III: Mass Spectrometric Thermal Analysis of Condensation Polymers

 

作者: GarsonP. Shulman,  

 

期刊: Journal of Macromolecular Science: Part A - Chemistry  (Taylor Available online 1967)
卷期: Volume 1, issue 1  

页码: 107-120

 

ISSN:0022-233X

 

年代: 1967

 

DOI:10.1080/10601326708053919

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

Mass spectrometric thermal analysis (MTA), the determination of total ion current as a function of time and temperature, has been employed for investigation of pyrolytic reactions (I). In combination with differential thermal analysis (Ib) it has proved to be very useful for distinguishing between energy changes caused by phase transformations and those caused by decomposition reactions. Determination of total ion current alone is not particularly informative in most cases of polymer degradation, when several products may be formed simultaneously or sequentially. We have modified the usual procedure by repeatedly scanning spectra, as the temperature is raised on a linear program, and then plotting peak height as a function of temperature. MTA determinations conducted in this way have been helpful in several polymer investigations currently in progress in our laboratory. The alternative method, recording of a characteristic peak for each product on an individual channel of the Bendix Time-of-Flight mass spectrometer, was rejected as less reliable and more cumbersome when the number of products exceeds the number of channels on the instrument.

 

点击下载:  PDF (442KB)



返 回