[5] 4) a) When LLDPE is made using a catalyst, ethylene (Et) is copolymerized with butene (Bt) in mole ratio of 2 of Et to 5 of Bt, the polymer formed (initially) has a composition exactly the same as the monomer feed. However, when the monomer ratio is 5 of Et to 1 of Bt, the polymer has a ratio of 5mol of Et to 3 of Bt. What monomer feed composition (mole fraction of Et will yield a polymer (initially) with equal moles of Et and Bt? [4] b) Provide representative DSC thermograms for i) HDPE and ii) LLDPE made using a metallocene catalyst using butene showing how butene effects Tg and Tm. [2] c) Predict the order of Tg for the following polymers, HDPE, LLDPE (P) (comonomer is propylene), LLDPE (B) (comonomer butene), LLDPE(H) (conomoner hexene), LLDPE (O) (comonomer octene). [2] d) Nova is building a new plant for LLDPE in Corunna with a 2.2B investment. They are using a new type of metallocene catalyst. Would you recommend a batch, semi-batch or continuous process and why? Should the LLDPE catalyzed proces be made by solution, suspension or emulsion polymerization and why? [2] e) Recycling of polymer films is a major challenge due to structure. Would a LLDPE film made from a conventional Ziegler-Natta catalyst or one made from a metallocene catalyst be easiser to recycle and why