Abstract
An attempt was made to determine the unperturbed chain dimension A of a segment polyurethane, prepared from polytetramethylene glycol (the number-average molecular weight 1500) methylene bis(4-phenyl isocyanate) and ethylenediamine. A whole polymer was fractionated by successive solution fractionation using dimethylacetamide (DMAc) as a solvent and methylalcohol as a precipitant into 23 fractions. Linearity of the segment polyurethane chain was confirmed by NMR and the solution viscosity change by addition of n-butylamine. The dilute solution properties of eight fractions in DMAc were investigated by the light scattering and viscometry at 25°C. The Mark–Houwink–Sakurada equation for the solution in DMAc at 25°C was [η]=0.101Mw0.59 (cm3 g−1) ([η]; limiting viscosity number, Mw; the weight-average molecular weight). A was found to be 1.02×108 cm for the solution. No significant solvation was observed by adiabatic compressibility measurement.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
