Abstract
Miscible blends of polyisoprene (PI) and poly(tert-butylstyrene) (PtBS) have been studied over the entire composition range by means of differential scanning calorimetry (DSC) and dielectric spectroscopy (DS) techniques. Blends with two different molecular weight PtBS, Mn = 1300 and Mn = 2300, and a Mn = 2700 PI have been investigated. The molecular weight of all the polymers were chosen in order to be well bellow the entanglement limit for PI. Calorimetric measurements confirm the presence of two component glass transitions (Tg) as previously reported. The comparison of the component’s Tg observed by DSC and the segmental dynamics directly measured for PI by DS, evidence the equivalence between the calorimetric effective Tg and the freezing of the segmental relaxation of PI around 102 s observed by DS. Fitting of the experimental Tg values to the Lodge−McLeish model gives self-concentration values that depend on the molecular weight of the PtBS. Finally, blends with the lowest PI content exhibit unusual ...
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.
