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Although increasing crosslink density and adding inorganic fillers to the polymer matrix yield moderate to large recovery stress improvements, less orthodox methods such as changing the polymer chemistry to impart mesomorphism or simply changing the deformation conditions (thermal or mechanical) have shown comparable effects.
Generally, iPP exhibits the monoclinic [alpha]-crystalline form under most air-quenched conditions and a smectic mesomorphism under ice-water quenched conditions.