What are the two micro-scale plasticity mechanisms active in amorphous polymers? Are they likely to occur simultaneously? Explain.

Give some examples of commercial products which are laminar composite structures.

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Nylon 6,6 is a thermoplastic polymer with high mechanical strength, high resistance to chemical environments, and good stability under heat. Therefore, it is well suited to be used in 3D structural objects. A cylindrical nylon 6,6 pipe is made by injection molding. The pipe is 1 m long with an outer diameter of 8cm, and a thickness of 2mm. The crystallinity of the pipe is 25%. The density and associated percent crystallinity for two nylon 6,6 samples are measured as below:     ρ(g/cm3) crystallinity (%) 1.190 67 1.155 44   If the degree of polymerization is 500, calculate the number of chains in the pipe. (Assume the chains are equal in length).

1. Do you think that Rapid Prototyping or medical scaffolding is a better application for MEX? Explain. 2. Why does the MEX process work better with amorphous polymers compared to crystalline polymers?

Describe the role of finite element analysis (FEA) in the prototyping of mechanical components. How does it help in optimizing product designs for performance and reliability?

Describe, giving an example, how annealing affects the dynamic-mechanical thermal (DMT) properties of crystalline thermoplastics.

What is the process for crosslinking elastomers called? Answer:

A composite material that has boron fibers coated in aluminum has a density of 2.65 g/cm^3. The fibers have a Young's modulus of 380 GPa, and aluminum has a Young's modulus of 70 GPa. The density of the fibers is 2.36 g/cm^3 and the density of the aluminum is 2.70 g/cm^3. What is the volume of the matrix? Answer:

Is the following figure showing continuous or noncontinuous fibers? What are the differences in making carbon fibers and glass fibers