| Summary: | 碩士 === 元智大學 === 化學工程研究所 === 89 === Poly(dially dimethyl ammonium chloride) (PDADMAC) is an important cationic polyelectrolyte, usually used in waste water treatment. The dependence of molecular chain conformation on molecular weight for PDADMAC in dilute water solutions was studied using static and dynamic light scatter (SLS and DLS). SLS measurement gives the information of weight average molecular weight (Mw), second virial coefficient (A2), radius of gyration (RG), depolarization ration (ρv) and differential refractive index (dn/dc). DLS measurement gives the information of hydrodynamic radius (Rh). Based on the experiment data, the variation of chain conformation with polymer molecular weight was discussed. Nine PDADMAC samples were used in this study, six were from Union Chemical Laboratory and three were from Aldrich Chemical Co.
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