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Saturday, March 31, 2012

hehehe

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tensile modulus increases.


(e) A drawn semicrystalline polymer that is annealed experiences a decrease in tensile modulus as a result of a reduction in chain-induced crystallinity, and a reduction in interchain bonding forces.


15.17 For each of four pairs of polymers, we are to do the following 1) determine whether or not it is possible to decide which has the higher tensile modulus; ) if it is possible, then note which has the higher tensile modulus and then state the reasons for this choice; and ) if it is not possible to decide, then state why.


(a) No, it is not possible. Both syndiotactic and isotactic polystyrene have a tendency to crystallize, and, therefore, we assume that they have approximately the same crystallinity. Furthermore, since tensile modulus is virtually independent of molecular weight, we would expect both materials to have approximately the same modulus.


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(b) Yes, it is possible. The linear and isotactic polyvinyl chloride will display a greater tensile modulus. Linear polymers are more likely to crystallize than branched ones. In addition, polymers having isotactic structures normally have higher degrees of crystallinity than those having atactic structures. Increasing a polymers crystallinity leads to an increase in its tensile modulus. In addition, tensile modulus is independent of molecular weight--the atactic/branched material has the higher molecular weight.tensile modulus increases.


(e) A drawn semicrystalline polymer that is annealed experiences a decrease in tensile modulus as a result of a reduction in chain-induced crystallinity, and a reduction in interchain bonding forces.


15.17 For each of four pairs of polymers, we are to do the following 1) determine whether or not it is possible to decide which has the higher tensile modulus; ) if it is possible, then note which has the higher tensile modulus and then state the reasons for this choice; and ) if it is not possible to decide, then state why.


(a) No, it is not possible. Both syndiotactic and isotactic polystyrene have a tendency to crystallize, and, therefore, we assume that they have approximately the same crystallinity. Furthermore, since tensile modulus is virtually independent of molecular weight, we would expect both materials to have approximately the same modulus.


(b) Yes, it is possible. The linear and isotactic polyvinyl chloride will display a greater tensile modulus. Linear polymers are more likely to crystallize than branched ones. In addition, polymers having isotactic structures normally have higher degrees of crystallinity than those having atactic structures. Increasing a polymers crystallinity leads to an increase in its tensile modulus. In addition, tensile modulus is independent of molecular weight--the atactic/branched material has the higher molecular weight.





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