https://www.sciencedirect.com/search?qs=injection%20moulding%20-PEEK%20nanocomposite%20with%20fibre&show=25&sortBy=relevance
Please, can you specify the nature of the nano particle and fibres and their amounts?
What you wish to optimize ? fiber length or composite strength ?
if you wish to avoid breakage of fiber coat fibers in advance with epoxy.
Dr ajitanshu sir,
We did epoxy coating, but futile
What to optimize composite strength.
Any insight help.
Dear Bhaskar,
In this case, even if you try a thicker coat of epoxy on fiber, it will be of no use keeping maximization of composite strength as a target. AS fiber is as much fragile the fracture will initiate due to fiber breakage. The fiber will not be able to sustain the load transferred by the matrix and that will lead to the initiation of the fracture and lower strength of the composite. I think using such weak fiber will definitely lead to a low strength composite.
Best wishes
I suggest careful heating above the melting temperature. PEEK can rapidly degrade.
1. Fiber reinforced Injection Molding is a tricky job, and many on-the-mold/machine "tricks"/experiments are needed to arrive at optimization.
2. Further, optimization would depend on what parameter is to be optimized
3. If the optimization is to have "best" size of the fiber for an end need, there are three main considerations: (i) The Resin must have appropriate "Flow" (A higher Flow Resin is better suited; but high flow Resins would lose on Mechanical - and some times, heat - properties); (ii) The Mold must be designed for very low "impingement factor". This will need correct design of Sprue and the "Entry Point Section"; sprue length, dia and the same for the Entry point; (iii) We must start experimenting with the "smallest" fiber length, and slowly take the experiment forward using longer fibers (smallest length could start with 0.5 mm, and increasing by additional 05 mm at each experiment level)
In general it is a Job that needs patience and over time we would be able to arrive at appropriate Formulation.
It would be better if the Formulation is first Extruded and granulated into appropriate granule sizes, before we attempt Injection molding
Best wishes
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