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Explain the thermodynamic and molecular differences between Tg and Tm in semi-crystalline polymers like POM and Nylon 6,6.
What causes sink marks in thick-walled injection molded parts, and how do packing pressure and gate freeze-off time solve it?
How is Melt Flow Index (MFI/MFR) correlated with molecular weight distribution (MWD) and shear-thinning power-law fluid behavior?
How do you calculate the critical extent of reaction (Pc) for trifunctional monomer polycondensation using the Carothers equation?