We have shown that with terminally functional, narrow distribution polymers it is possible to use SEC to measure the amount of block copolymer produced during reactive blending. We observed significant coupling of chain ends and changes in the two phase morphology. The amount of BCP formed, 1-3%, is about half that needed to completely cover the surface of the minor phase. The much higher values of reactively formed BCP reported in the literature are most likely due to difficulties with complete extraction of the homopolymers. When reaction rates are estimated based on the interfacial volume available they are considerably higher than the homogeneous rates. Shear rate seems to enhance the rate of BCP formation. This is surprising since the reaction does not appear to be diffusion controlled. High shear stresses may be able to pull the reactively formed BCP out from the interface, allowing it to form micelles in the homopolymer phases.
|Original language||English (US)|
|Number of pages||2|
|Journal||Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Materials Science and Engineering|
|State||Published - Dec 1 1993|
|Event||Proceedings of the American Chemical Society Division of Polymeric Materials - Science and Engineering - Chicago, IL, USA|
Duration: Jun 11 1993 → Jun 11 1993