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Paper Information

Journal:   IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)   DECEMBER 2011-JANUARY 2012 , Volume 24 , Number 5 (ISSUE NUMBER 115); Page(s) 404 To 412.
 
Paper: 

DETERMINATION OF POLYBUTADIENE UNSATURATION CONTENT IN THERMAL AND THERMO-OXIDATIVE DEGRADATION PROCESSES BY NMR

 
 
Author(s):  ZIAEE FARSHID*
 
* IRAN POLYMER AND PETROCHEMICAL INSTITUTE, TEHRAN, IRAN
 
Abstract: 

The unsaturation content of various polybutadiene (PBD) types of 1, 4-cis, 1, 4-trans and 1, 2-vinyl isomers with different molecular weights was investigated. An important parameter for unsaturation content of polybutadiene would be the determination of olefinic and aliphatic contents for three types of isomers. For this purpose, proton and carbon nuclear magnetic resonance spectroscopy methods were employed for determination of 1, 4-cis, 1, 4-trans and 1, 2-vinyl contents. A change of adjustable parameter of NMR software was made for accurate integrals giving better results. The accuracy in calculation of low molecular weight PBD, surface area of chain end group decreased in aliphatic region. Furthermore, the changing of unsaturation content versus time was considered for 1, 2-PBD and 1, 4-PBD in thermal degradation conditions at 250oC. NMR results showed that during heating, the unsaturation content decreased for 1, 2-PBD and was not changed for 1, 4-PBD. In fact, the basic factor responsible for changing of unsaturation content in thermal degradation of PBD may be due to the presence of 1, 2-vinyl isomer. Finally, changing in unsaturation content versus time was observed for 1, 2-PBD and 1, 4-PBD in thermo-oxidative degradation conditions at 100oC. The NMR results showed that at extended time, the unsaturation content decreased for 1, 4-PBD and was not changed for 1, 2-PBD. Moreover, the basic factor for changes in unsaturation content in thermo-oxidative degradation of PBD is due to the presence of 1, 4-cis and 1, 4-trans isomers.

 
Keyword(s): POLYBUTADIENE, NMR, UNSATURATED CONTENT, DEGRADATION, CHARACTERIZATION
 
 
References: 
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Click to Cite.
APA: Copy

ZIAEE, F. (2012). DETERMINATION OF POLYBUTADIENE UNSATURATION CONTENT IN THERMAL AND THERMO-OXIDATIVE DEGRADATION PROCESSES BY NMR. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 24(5 (ISSUE NUMBER 115)), 404-412. https://www.sid.ir/en/journal/ViewPaper.aspx?id=273887



Vancouver: Copy

ZIAEE FARSHID. DETERMINATION OF POLYBUTADIENE UNSATURATION CONTENT IN THERMAL AND THERMO-OXIDATIVE DEGRADATION PROCESSES BY NMR. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN). 2012 [cited 2021May06];24(5 (ISSUE NUMBER 115)):404-412. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=273887



IEEE: Copy

ZIAEE, F., 2012. DETERMINATION OF POLYBUTADIENE UNSATURATION CONTENT IN THERMAL AND THERMO-OXIDATIVE DEGRADATION PROCESSES BY NMR. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), [online] 24(5 (ISSUE NUMBER 115)), pp.404-412. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=273887.



 
 
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