I am working on polyhydroxyalkanoates.
While working I am getting meting temperature of the polymer is around 150 to 180 degree Celsius.
From the structure its clearly visible the polymers are not pure PHB.
So I want to know the melting temperature of pure polyhydroxyvalerate?
In the attached reference polyhydroxybutyrate " PHB" is reported to have a melting point of 170–180 °C :
https://www.smithersrapra.com/SmithersRapra/media/Sample-Chapters/Mouldable-Particle-Foams.pdf
Well, a wide range of melting indicates the presence of impurities. Since melting is a "point" , then it must have a range of less than 3 oC.
By looking at the structures of PHB & polyhdroxyvalerate "PHV" on page 97 of the given reference, we can deduce that PHV will have a lower melting point than PHB provided that they have similar average molecular masses.
I expect the melting point to be around 165 oC.
You can visit the following page for the physicochemical property of PHV.
http://www.goodfellow.com/catalogue/GFCat4U.php?statsearch=BV30*~$E
The usual melting temperature of PHA is in the range of 165–180 °C.
The higher the HV content lower the Tm. (which is usually 101-138 °C).
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It should be added to the answer Prasun Kumar. In addition to the inclusion of PHV, the melting will be affected by the statistical distribution of PHV in PHB molecules.
You might also find this paper useful: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3617235/ as stated previously the melting point can depend on the HV % content and the precise origin of your sample.
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