A series of poly(aryloxyphosphazene)s was prepared with phenoxy and p‐ethylphenoxy substituents in various ratios. The thermal, morphological, and rheological properties of this series of polymers were studied by differential thermal analysis, x‐ray analysis, and rheometrics mechanical spectroscopy. Thermal analysis showed that the resulting polymers follow melting‐point‐depression‐ and glass‐transition‐temperature‐composition relationships expected of random copolymers. The lower first‐order transition temperature [T(1)] disappears near equimolar substitution while the higher first‐order transition temperature (Tm) persists over the whole range of compositions. X‐ray analysis revealed that crystalline order in the polymer chain direction is destroyed by nearly equimolar substitution but lateral order remains. The rheological characterization of a copolymer with nearly equimolar substitution showed that the polymer is in a pseudocrosslinked state indicating the existence of chain‐to‐chain interactions. When a small amount of an antioxidant (6‐dodecyl‐1,2‐dihydro‐2,2,4‐trimethylquinoline) is added, the lateral order of the copolymer is destroyed, and its rubbery plateau modulus decreases by several fold.
Depolymerized scrap rubber (DSR) shows stabilizer activity for solution SBR rubber. It appears that the stabilizer activity of conventional rubber reclaim is due, to a significant extent, to the hydrocarbon portion.
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