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- 8.61 Distinguish between a block copolymer and a graft copolymer.Draw the isotactic, syndiotactic, and atactic form of polypropylene in kekule structure.Determine whether the first part of statement will INCREASE, DECREASE or HAVE NO EFFECT in the second part of the statement. 1.If there is an increase in amount of plasticizer in polycarbonate then the stiffness will _____. 2. If we substitute the Fe3+ (64 pm) in hematite ((-Fe2O3) by Zn2+ (73 pm), then the Interplanar distance will _______. 3. If there is an increase in plar groups then the degree of polymerization will ________.
- High-density polyethylene (HDPE) is opaque while low-density polyethylene (LDPE) is transparent. Which form of PE is mechanically more flexible? Justify your answer.How does a polypropylene face mask become polymeric carbon dots?Draw the structures of isotactic poly(acrylonitrile) and syndiotactic polystyrene.
- Nanostructures are from the breaking up of bulk materials a. The top down approach b. The bottom up approach c. The bottom down approach d. The top up approachDraw isotactic triad of polypropylene and AIBNWhat is the primary structural feature necessary for a molecule to make it useful in a condensation polymerization reaction?
- Describe TWO (2) important factors that affect materials chain flexibility and properties Discuss briefly factors that influencing plastic properties. What are important factors influencing glass transition temperature of amorphous polymers?• State which particle sizes are more important with respect to alveolar deposition and why. • Explain the influence of moisture, temperature, and sunlight on the severity of air pollution effects on materials.Define the terms monomer, plastic, thermoplastic, thermosettingplastic, elastomer, copolymers, and cross-linking?