Why do thermoset plastics usually require fibrous reinforcement?

List $5$ properties that are higher when we use continuous fibers as reinforcement?

How do we use $2-$phase polymer systems to produce $($a$)$ high$-$impact rigid plastics, $($b$)$

thermoplastic elastomers?

How is ABS produced? What is its structure?

Why is LLDPE $+$ LDPE the largest market volume polyblend?