Hi guys. I am currently doing a research on the use of thermoplastic fibers as reinforcement, which is a relatively new idea. Fiber reinforced polymer (either thermoset or thermoplastics) composites can be tailored to meet different requirements and applications by customizing. Thermoplastics generally offer better impact resistance compared to thermosets. My studies will be to test the properties of a composite composed of polymer matrix and thermoplastic fabric reinforcement. Usually, for thermoplastic composites, the thermoplastic component comes from the matrix or resin, whereas the fiber can be carbon. But i am trying to explore the use of thermoplastic fiber as reinforcement instead. 

Is there any recommendation for me to start? is there any thermoplastic fiber that i can consider to use in my composite? in this composite, what kind of matrix (thermoplastic or thermoset) will be best for my composite.

Are you on about comingled materials? As they have been around for a long time and as others have suggested there's materials like srpp self reinforced polypropylene 

I would have a look at the fibretec website as Bob has created a series of thermoplastic prepregs,, although I've not had the chance to try them yet?