= - = 15. Consider the tracer diffusion coefficient of polystyrenes in the melt, at 176 C. At this temperature, M. = 13,000 g/mol, Mo = 104 g/mol, and KTIG = 10-9 cmWhat is D, for M = 13,000 under these conditions? What is D for M = 65,000 dissolved as a tracer in a melt with M = 13,000? Suppose the M = 13,000 matrix polymer was end-functionalized at both ends, so that it could be cross-linked. Suppose that a small amount of bifunctional agent was added and reacted to completion; the M = 13,000 polymers were therefore all end-linked to form very long linear chains. What would D, be for the M = 65,000 tracer then? Suppose that the cross-linking agent was tetrafunctional, so that a complete network was formed. What would D, be for the M=65,000 tracer in this case? = = - = 15. Consider the tracer diffusion coefficient of polystyrenes in the melt, at 176 C. At this temperature, M. = 13,000 g/mol, Mo = 104 g/mol, and KTIG = 10-9 cmWhat is D, for M = 13,000 under these conditions? What is D for M = 65,000 dissolved as a tracer in a melt with M = 13,000? Suppose the M = 13,000 matrix polymer was end-functionalized at both ends, so that it could be cross-linked. Suppose that a small amount of bifunctional agent was added and reacted to completion; the M = 13,000 polymers were therefore all end-linked to form very long linear chains. What would D, be for the M = 65,000 tracer then? Suppose that the cross-linking agent was tetrafunctional, so that a complete network was formed. What would D, be for the M=65,000 tracer in this case? =