Characterization of nonionic and cationic amine-functional polymers by aqueous SEC-MALLS

✍ Scribed by Dennis J. Nagy

• Book ID: 102653868
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 842 KB
• Volume: 59
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960228)59:9<1479::aid-app16>3.0.co;2-u

✦ Synopsis

Molecular weight, root-mean-square radius, and conformational information obtained from aqueous size exclusion chromatography (SEC) and multiangle laser light-scattering (MALLS) detection are examined for amine-functional polymers. These include homopolymers and copolymers of poly(etheny1formamide) and cationic poly(viny1amine). Lightscattering studies for poly(etheny1formamide) employing 15 angles of detection are used to calculate molecular weights as high as 700,000 daltons with a root-mean-square radius of nearly 50 nm. Calculated conformational coefficients indicate a random-coil configuration at low molecular weights and a more compacted conformation a t high molecular weights. Molecular weights and root-mean-square radius values for cationic poly(viny1amine) are determined using a three-angle MALLS detector. Root-mean-square radius is strongly dependent on the ionic strength of the mobile phase. Cationic poly(viny1amine) exhibits a rod-like conformation at both low and high ionic strength. Explanations are proposed for this behavior.