Dear all,

polymers neither boil nor evaporate, they degrade at high temperature, the explanation is that the boiling/evaporation involve the breaking (rupture) of all sorts of secondary forces acting between molecules, in other words to say you should give enough energy to exceed the cohesive energy density which maintain the chains together, this energy is by far higher then any form of primary bonding, so the polymer will degrade before to reach the adequate energy to separate chains for freely boiling or evaporating. Regards

Please find attached some papers on the thermal decomposition of lignin and chitosan. As both are natural polymers, there may be variations in their behavior, depneding on the origin and processing of th sample.

http://www.cellulosechemtechnol.ro/pdf/CCT4-6-2009/133-139.pdf

http://www.slac.stanford.edu/econf/C0908211/pdf/021.pdf

https://www.researchgate.net/publication/227821001_Thermogravimetric_and_differential_thermal_analysis_of_cellulose_hemicellulose_and_lignin

http://www.scielo.cl/scielo.php?pid=S0717-97072004000400005&script=sci_arttext

http://www.ptchit.lodz.pl/file-PTChit_(dp2ic83p2a8nsc3o).pdf.

http://scholarsresearchlibrary.com/dpl-vol5-iss2/DPL-2013-5-2-354-363.pdf

Article Thermogravimetric and differential thermal analysis of cellu...

Dear all;

following are two interesting books on chitosan and lignin. Regards

Thanks a lot ! :D :D