I am looking for the experimental conditions for the PHA thermoforming.
i have my life to improve PHB or PHB/V to used as film in food packing application as film for deep drawing articles . this bioplastics (PHB or PHB/V) are very sensitive to high temperatures melt processing ,i.e before reach its melting point , it become degradation, this leads to a decrease in molar weight, as well as a drop in the melt viscosity, i.e. the crystallization temperature shifts to a lower value, and the crystallization kinetics are slow.
Hello dear, if you want to make thermoformed any polymer, You have to obtain the heat deflection temperature (HDT) of the material since this have to be the temperature of the process. Furthermore, you have to optimize the conditions of vacuum for obtaining a complete form of the material according to the mold. Therefore, obtain the morphology wanted.
Thank you to all for your answers. I am going to try to optimize the experimental conditions and also to work on the formulation. Very few papers deal with the thermoforming of PHAs.
Your welcome Dr. Stéphane I am sure that if you obtain the HDT value of you polymer and conditions of vacuum you will obtain your thermoformed material, since the main parameter is HDT value of your material. Best regards
I am going to have a student on training from next monday. I will give you some news about that if you are always interested by this question.
Hello Stéphane,
Auriez-vous avancé sur le thermoformage de PHAs? Auriez-vous éventuellement des papiers sur le sujet? Merci!
Non. C'est vieux cette question pcq on avait une presta là-dessus. On s'en était sorti en faisant des mélanges PHBV/PLA. Le PLA se thermoforme très bien.
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