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for the follwing pair of polymers,do the following:(1)state whether it is possible to decide if one polymer has a higher tensile modulus than the other;(2)if this is possible,note which has the higher tensile modulus and then cite the reason(s) for your choice;and (3) if it is not possible to decide,then state why not.
-syndiotactic polystyrene having a number-average molecular weight of 400,000g/mol
-isotactic polystyrene having a number-average molecular weight of 650,000g/mol
8.8 for the follwing pair of polymers,do the following:(1)state whether it is possible to decide if one polymer has a higher tensile modulus than the other;(2)if this is possible,note which has the higher tensile modulus and then cite the reason(s) for your choice;and (3) if it is not possible to decide,then state why not.
-syndiotactic polystyrene having a number-average molecular weight of 600,000g/mol
-isotactic polystyrene having a number-average molecular weight of 500,000g/mol

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tutorconsortium647

Yes, it is possible.

The tensile modulus of the linear and isotactic poly(vinyl chloride) will be higher. Compared to branched polymers, linear polymers are more prone to crystallize.

What is the mechanical properties of polymers?

The moduli of elasticity and other classes of strength measures, such as the yield and tensile strengths, can be used to characterize the mechanical properties of polymers in a manner that is quite similar to that of metals or other common crystalline materials. The most significant mechanical and elastic characteristics of polymeric materials are summarized generally below:

  • Strength: Whenever the applied force is greater than a straightforward linear elastic deformation, represents the stress force required to fracture the material sample under investigation. Tensile strength (stretching of the polymer), compressional strength (compressing the polymer), flexural strength (bending of the polymer), torsional strength (twisting of the polymer), and impact strength are some of the most important types of strength quantities used in typical materials characterization measurements (e.g. under the effects of direct hammering).
  • Percent Elongation to Break (Ultimate Elongation): This statistic, expressed as a percentage change in the material's length, describes the maximum strain that the polymer sample can experience before it ultimately breaks (at the aforementioned strength point).
  • Young's Modulus: A measure of a material's total stiffness, it is the ratio of stress to strain in the region of its linearly elastic response.

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