14 samples of SAN copolymers and fractions-were investigated by means of light scattering in T H F as a solvent. The Zimm plots are given. The measured data dI, and (S2) are plotted according t o expressions derived from the FLORY equation a6 -a3 = Cz, from the Fixman equation a8 -1 = C'z, and from the approximation or2 = 1 + (134/105)z. The treatment according to Flory yields (S2)0/M= 16,3cmz mol g l . This value of unperturbed dimensions produces z-data and values of the h(Z) function which lead t o a good correspondence between the calculated and the measured values of the second virial coefficient. Ober das Verhalten von Styrol-Acrylniiril-Copolymeren in L&ung. I V . Lichtstreuungsuntersuehung an azeotropen Copolymeren in Tetrahydrofuran 14 Proben von SAN-Copolymeren und -Fraktionen wurden in T H F untersucht. Die Zimm-Diagramme werden angegeben. Die MeBwerte fur 111, und (S8) werden entsprechend der FLoaY-Beziehung a5a, = C . z, der Fixman-Gleichung c 8 -1 = C' . z und der Naherung ua = 1 + (134/105) z aufgetragen. Die Flory-Auswertung ergibt (Sa)O/M = 16,3 . cmz mol g-l. Dieser Wert fiir die ungestorten Dimensionen ergibt fur z und die Funktion h(Z) Werte, mit denen die daraus berechneten Virialkoeffizienten A, die beste tfbereinstimmung mit dem Experiment zeigen. 0 nosedenuu conommepoe cmupofia u axpumnumpufia s pacrneope. I V . Eiccfiedoeaxus pacmsopoe aaeomponnwx conomuepoe e mmpazuapogbypane wmoaoa csemopaccesnw klccnenoaanxcb 14 0 6 p a 3~0~ cononmepoB cmpona H aKpnnoHzTpuna n YIX @paKqm B TeTparxqpo@ypaHe. H a AHarpaMMaX UHMMa IIPHBOAFITCFI EJKCIIepHMeHTaJIbHMe 3aHSeHHtf Hw II (s2) B COOTBeTCTBHH C KiBHCHMOCTbIO @nopH a5as = c 2, 4 , I I K C M t u r a d -1 = c' -Z II IIpH6JIHXeHkieM (Yz = 1 + (134/135) Z. nyTeM 0 6 p a 6 o~~~ AaHHLdX IIO CMs -MOZb * I -' .klCIIOJIbBOBa€IE€! EJTOrO 3HaSeHHFI AJIH HeBO3MylqeHHbIX pa3MepOB IIPHBOAHT K 3HaSeHKFIM AJIR 2 II @yHKqHEf h(Z), KOTOpbIe AaIOT BKpHaJIbHHe HOt@@HqHeHTbI A,, COBIIaAaIOlqHe HaEIJIyWIIHM 0 6 p a a o~ C EJKCIIepHMeHTOM .
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