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- 1. (a)Differentiate polypropylene and Polyurethane in term of(i)molecular structure(ii)behaviour upon heating(iii)classifification or type of polymer(iv)based on their structure, draw the stress-strain curve of both polymer.(b) Composites can be used in many applications such as sport equipment, automotive industry and Oil and gas industry.(i)Suggest one composites materials and parts/component used in these applications.(ii)Why the composite material is used for those parts as stated your answered aboveAlthough styrene undergoes both cationic and anionic polymerization equally well, one method is often preferred with substituted styrenes.Which method is preferred with each compound? Explain.Although styrene undergoes both cationic and anionic polymerization equally well, one method is often preferred with substituted styrenes. Which method is preferred with each compound? Explain.
- A characteristic of the stoichiometry of condensation (step-growth) polymerization reactions is that small molecules, like H2O, HCl or others, are released as reaction by-products. In a commercial polymerization reactor, what might be some process implications of the release of small molecules like H2O or HCl?Write chemical reactions illustrating a polymerization mechanism involving the monomers listed below. Would the reactions be considered step growth or chain growth? Explain and supportA crosslinked copolymer consists of 59 wt% ethylene (C2H4) repeat units and 41 wt% propylene (C3H6) repeat units.Determine the fraction of (a) ethylene and (b) propylene repeat units.
- What is the fraction of monomers (p) that have been used in a stepwise polymerisation reaction if the reaction solution started with a monomer concentration of 1.58 mol L-1 and now has a concentration of 0.231 mol L-1?Why do some polymers get stronger as we stretch them beyond a region where necking occurs?Organic chemistry: brief introduction of interfacial polymerization by nylon
- Producing a polymer part whose medium of use will be water at a constant temperature of 90°Cis considered. Dimensional stability is of great importance during the use of this part.As it is stated that; The polymer of the formula below is suitable for such an application.Write down the reasons why ?The following table lists molecular weight data for a polypropylene material. compute the following. a) the numbr-average molecular weight 2) the weight-average molecular weight 3) the degree of polymerizationSketch and label the expected stress-strain curves at room temperature for lightly cross-linked poly(butadiene) and reinforced poly(methyl methacrylate). Compare the behaviour of each specimen in terms of modulus and toughness.
