II.Choose the correct answer(s)to the following questions(35pts) 1.Monomers with one or more multiple covalent bonds,such as ethylene A.Unsaturated hydrocarbons B.Aerogels Saturated hydrocarbons ，Zeolite 2 is not a chemical reaction in which simple molecules are added to each other to form long chain molecules without by products. A.Addition polymerization B.Condensation polvmerization C.Ring-opening polymerization D.Bulk polymerization 3 A the mosetting polymer like epoxy A.typically can not be recycled B.usually involves the mixing of two or more components which are then oolymerized. C.is relatively strong because molecules are crosslinked together D.can not be easily re-shaped after curing E all of the abo 4.Chemical that serves as "molecular matchmaker"necessary to begin polymerization reaction. A.Monomer B.Isotope C.Catalyst D.Filler 5.The strength of a the noplastic polymer such as polyethylene tends to increase after axial deforma ecaus A.cros uring defomtion B.oxidation occurs during deformation in air at room temperature C.polymer chains tend to align themselves with the chain axis oriented along the direction of deformation D.none of the abo 6 A low mole ular weight polymer additive that enhances flexibility and reduces stiffness and brittleness is referred as A.Colorants B.Plasticizer Flame retardants D.Foam agents are used in plastic in order to protect plastics against deterioration due to environ ntal condition A.Lubricants B.Stabilizer C.Filler D.Accelerators is used in curing system to speed up the sulfur vulcanizing. A.Lubricants,B.Plasticizer,C.Hardener,D.Accelerators, is not the common phenomena of thermoplastic's deterioration .Weight loss B.Disco C.Swel ing D.Cr acking 10.Which advantage do smart polymeric materials offer designers? A.Eliminate selection problem, B.Reduce raw materials costs C.Adapt to environmental change D.Reduce processing 11.Which of the following comparison is correct? A.Thermal conductivity: netal plastics B.Thermal expansion: metal plastics C.Density:metal>plastics D.None of the above 2 II. Choose the correct answer(s) to the following questions (35pts) 1. Monomers with one or more multiple covalent bonds, such as ethylene A. Unsaturated hydrocarbons B. Aerogels C. Saturated hydrocarbons D. Zeolites 2. is not a chemical reaction in which simple molecules are added to each other to form long chain molecules without by products. A. Addition polymerization B. Condensation polymerization C. Ring-opening polymerization D. Bulk polymerization 3. A thermosetting polymer like epoxy_______________ A. typically can not be recycled. B. usually involves the mixing of two or more components which are then polymerized. C. is relatively strong because molecules are crosslinked together. D. can not be easily re-shaped after curing E. all of the above 4. Chemical that serves as “molecular matchmaker” necessary to begin polymerization reaction. A. Monomer B. Isotope C. Catalyst D. Filler 5. The strength of a thermoplastic polymer such as polyethylene tends to increase after uniaxial deformation, because___________. A. cross linking occurs during deformation B. oxidation occurs during deformation in air at room temperature C. polymer chains tend to align themselves with the chain axis oriented along the direction of deformation D. none of the above. 6. A low molecular weight polymer additive that enhances flexibility and reduces stiffness and brittleness is referred as . A. Colorants B. Plasticizer C. Flame retardants D. Foam agents 7. are used in plastic in order to protect plastics against deterioration due to environmental conditions A. Lubricants B. Stabilizer C. Filler D. Accelerators 8. is used in curing system to speed up the sulfur vulcanizing. A. Lubricants, B. Plasticizer, C. Hardener, D. Accelerators, 9. is not the common phenomena of thermoplastic’s deterioration. A. Weight loss B. Discoloration C. Swelling D. Cracking 10. Which advantage do smart polymeric materials offer designers? A. Eliminate selection problem， B. Reduce raw materials costs C. Adapt to environmental change D. Reduce processing 11. Which of the following comparison is correct? A. Thermal conductivity: metal < plastics B. Thermal expansion: metal > plastics C. Density: metal > plastics D. None of the above