My coworkers and I work on fabrication of some bioabsorbable interference screws from composite of PLLA + bioactiveglass 45s5 and also PLLA+ HA(hydroxyapatite) (75/25 weight percent) by injection molding method for research purposes, injection of screws from neat PLLA does not have any special problem but, when we tried to use biocomposite granules, it seems that the compound could not be melted and flowed properly and so could not inject into the die , we prepared the primary compound of the mentioned biocomposites by ball milling and next internal mixing of both powders with each other and next during fed into the injection unit, it is very adhesive and sticks to the mandrel of injection unit of machine, this is really a problem for us and we really stuck with it, so I would really appreciate if I could have your tips about this problem.
I look forward to hearing from you soon
With best regards
Hello Mohammad
It isn´t normal for these composites to stick in the screw injection machine.
The HA increases the temperature of the PLLA/HA composite. Is probably that the melting point of the composite are higher than the working temperature.
When the size of the particles decreases is posible that the melting point increase.
Make a DSC of each of the composites to determine the melting temperature of the material. The working temperature should be about 10 degrees higher than the DSC contribution.
Best regards
José Miguel
Dear jasim
we want to use the molded materials in in-vivo assay
PEG is safe for that porpose?
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