Influence of anionic form on thermal degradation of TMAHP–cellulose

✍ Scribed by Ivan Šimkovic; Miroslav Antal; Vincent Mihálov; Jozef Königstein; M. M. Micko

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 317 KB
• Volume: 30
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1985.070301217

✦ Synopsis

Synopsis

Trimethylammoniumhydroxypropyl (TMAHP)-cellulose in 10 anionic forms (F-, C1-, Br-, I-, HSO,-, NOT, OH-, HCO,, H2POr, CH,COO-) was prepared, and the influence of each anion on thermal degradation in inert atmosphere was studied. With the help of dynamic and isothermal thermogravimetry (TG) it was found that HzPOi ions had the greatest retarding effect on TMAHP-cellulose degradation. From the values of rate constants it can be seen that all ionic forms of TMAHP-cellulose have the starting rate of thermal degradation greater than unmodified cellulose. The calculated values of activation energy of thermal degradation for different ionic forms are decreasing in following sequence: H,PO,-> F-> NOT > I-> Br-> HC0,-> C1-> HSOi > OH-> unmodified cellulose > CH,COO-. From the results of pyrolyse measurements in combination with gas chromatography and mass spectrometry (Py-GC-MS) it follows that the products of the elimination of quarternary ammonium salts are trimethylamine, 3-hydroxy-2-propanone, and, in the case of OH-form, water. In all other ionic forms the third product is the corresponding acid.