Spin Probing of the Structure and Dynamics

Other studies have involved poly(styrene-co-p-(hexafluoro-2-hydroxyisopropyl)-a-methyl-styrene) copolymers (PS(OH)-x with the mol.% of hydroxyl groups 

Miscibility in s-IPNs was also examined for systems consisting of STMAA and the spin-labeled poly(e-caprolactone) (PCL) [79]. The results of this study led to the conclusion that, in the case of polymers interacting via hydrogen-bonding, the intracomponent crosslinking is not in favor of miscibility. The microphase 

d) Tempol, and (e,f) Tempamine in motional component signals (sand/ respec-PS(OH)-8/PPC (left column) and PS(OH)-27/ lively). Reprinted with permission from PPC (right column) blends. Arrows indicate Ref [75] 2004, Elsevier. 

An opposite effect has been reported recently for s-IPNs of polyisoprene (PI, elastic component) and poly(methyl methacrylate) (PMMA, rigid component) probed with Tempol [67]. The EPR spectral features, as well as DMA, SEM and 

TEM data, consistently indicated that in this system heavy crosslinking enforced miscibility, leading to smaller PMMA domains within the PI matrix. 

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