On the Intramolecular Light Scattering of the Non-Gaussian Chain

The intramolecular light scattering function P (θ) of the non-Gaussian chain is investigated. For small values of s =(4π/λ)sin (θ/2), where λ is the wavelength of light in the solution, θ, the scattering angle, 1/ P (θ) is given by 1+( s 2 /3)< r G 2 >, and < r G 2 > the mean square radius of gyration from the center of mass can be calculated according to various theories. For sufficiently large values of s , 1/ P (θ) is expanded in terms of 1/ s 2 so as to obtain the asymptotic behavior of 1/ P (θ) vs. sin 2 (θ/2) plot. Excluded volume and swelling effects on 1/ P (θ) are discussed in a general way. The asymptotic behavior for large s of the experimental results by Cantow-Schulz is analyzed according to the theory.