A.0 Test Solutions 341 10.In PVC,there is hydrogen bonding (secondary bonding)between a hydrogen of one molecule and the chlorine of another molecule(the following diagram is not required): HH Molecule 1 H:CI ·Hydrogen bond H CI- C一C Molecule 2 HH 11.Toxicity of the monomer;high cost of the catalyst. 12.Add either a viscoelastic material or a nanofiber material to the composite at the interlaminar interface(mentioning either material is sufficient). 13.PPS is a thermoplastic that has thermosetting character,so it cures to a limited degree as it spends time below the melting temperature prior to bonding. 14.It is covered with a nonporous protective layer of aluminum oxide. 15.The reduced availability of oxygen at the crevice in the fastened joint results in an oxygen concentration cell,meaning that the crevice region becomes the anode. 16.Sand blasting removes the impurities on the surface of the rebar,thus resulting in a more uniform surface composition. 17.The decrease in void content as the latex/cement ratio increases up to about 0.15 is due to the latex.The increase in void content as the latex/cement ratio increases beyond about 0.15 is due to the decreasing degree of fiber dispersion (Fiber clumping increases the void content.)A.0 Test Solutions 341 10. In PVC, there is hydrogen bonding (secondary bonding) between a hydrogen of one molecule and the chlorine of another molecule (the following diagram is not required): H H C C H Cl H C C H H Hydrogen bond Molecule 1 Molecule 2 + H H C C H Cl H Cl C C H H + 11. Toxicity of the monomer; high cost of the catalyst. 12. Add either a viscoelastic material or a nanofiber material to the composite at the interlaminar interface (mentioning either material is sufficient). 13. PPS is a thermoplastic that has thermosetting character, so it cures to a limited degree as it spends time below the melting temperature prior to bonding. 14. It is covered with a nonporous protective layer of aluminum oxide. 15. The reduced availability of oxygen at the crevice in the fastened joint results in an oxygen concentration cell, meaning that the crevice region becomes the anode. 16. Sand blasting removes the impurities on the surface of the rebar, thus resulting in a more uniform surface composition. 17. The decrease in void content as the latex/cement ratio increases up to about 0.15 is due to the latex. The increase in void content as the latex/cement ratio increases beyond about 0.15 is due to the decreasing degree of fiber dispersion. (Fiber clumping increases the void content.)