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小木虫论坛-学术科研互动平台 » 化学化工区 » 高分子 » 高分子物理 » 求大神解答几个问题！
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[求助] 求大神解答几个问题！

2. For a series of homopolymers varying only in molecular weight, with all samples dissolved at equal concentration c in dilute solution, do the larger molecular weight samples scatter light more, or less, strongly than the lower molecular weight samples? Also at equal c, is the osmotic pressure for a larger molecular weight sample larger or smaller than that for a lower molecular weight sample?
3. A GPC was calibrated with molecular weight standards of a flexible polymer. Now, the apparent molecular weight of a stiffer polymer is determined relative to these standards. Will this apparent molecular weight be larger or smaller than the true value? Answer the same question for an intrinsic viscosity evaluation of the stiffer polymer’s molecular weight made by using the Mark-Houwink coefficients of the flexible polymers (assume both polymers are dissolved at theta conditions and that the repeat unit mass and length are the same)?
4. The excess polarizability of a dilute, dissolved polymer chain varies with what power of molecular weight? The intensity of light scattered by this polymer varies with what power of molecular weight? Under what condition is the light scattered from a polymer isotropic (i.e., at equal intensity for all directions within the scattering plane)? What effect causes the scattering of light to be anisotropic (i.e., not isotropic)?
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