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Molar mass determination of poly(octadecene-alt-maleic anhydride) copolymers by size exclusion chromatography and dilute solution viscometry |
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| Authors: | Mark C DaviesJohn V Dawkins Douglas J HourstonElizabeth Meehan |
| Affiliation: | a Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK b Institute of Polymer Technology and Materials Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK c Polymer Laboratories Limited, Essex Road, Church Stretton, Shropshire SY6 6AX, UK |
| Abstract: | The number average molar mass Mn of poly(octadecene-alt-maleic anhydride) (PODMA) copolymers calculated from data obtained by size exclusion chromatography (SEC) using a polystyrene (PS) calibration was found to be inaccurate. The use of SEC combined with dilute solution viscometry enabled a method to be developed using an iterative approach, which does not require knowledge of the Mark-Houwink constants for PODMA samples. A new calibration curve was constructed as a plot of molar mass Mu for PODMA. True number-average molar masses Mn (true) calculated using the new calibration are approximately twice the apparent molar mass Mn (app) based on a PS calibration for higher molar mass samples (>10?000 g mol−1). |
| Keywords: | Maleic anhydride α-Olefin Alternating copolymers |
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