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Explain and differentiate between stacked and pillared structures.
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- High-density polyethylene (HDPE) is opaque while low-density polyethylene (LDPE) is transparent. Briefly explain this phenomenon in terms of structure.Use an example to show how branching and cross linking can affect the physical behavior of a polymer.Use an example to show how branching and crosslinking can affect the physical behavior of a polymer.
- To form an addition polymer, what structural feature must the monomer possess?Three molecular requirements for crystallinity in polymersc) The physical characteristics of a polymer depend not only on its molecular weight and shape, but also based on the structure of the molecular chains. Classify the differences between all the molecular chains.
- a) Why polycrystalline form of a material is stable than single crystalline form?Please give a brief and clear answer. Describe how polymer morphology affects a polymer’s overall properties and behavior.Differentiate thermoplastic and thermosetting polymers and explain the reason behind the difference in their properties.
- What exactly is meant by the term "homogeneous structure"?Write about high density polyethylene and low density polyethylene and their advantage and disadvantage as well as their applicationsThe heat of fusion of polyethylene is approximately 7.7 kJ/mol, and the corresponding entropy is 19 J mol-1 K-1. Use these data to estimate the melting point of polyethylene.
