The mechanical spectra in Fig. 3 were measured at low strain
amplitude (~0.1%). To assess the thermal and mechanical lability of
the allo domains, we measured the strain dependence of the dynamic
modulus at various temperatures (Fig. 4). At low temperatures,
well below the glass transition temperature of the allo
domains, there is a marked effect of strain, the storage modulus
decreasing for strains exceeding ca. 1%. This result indicates that
deformation disrupts the hard domain structure. This phenomenon,
the Payne effect, is well known for rubbery polymers reinforced
with hard particles. For particulate fillers the strain
associated with a modulus decrement falls in the range from ca.
1e100%, increasing for lower concentrations of particles [29,33].
The energy loss associated with breakup of the structure gives rise
to a peak in the loss modulus (not shown). The block copolymer
The mechanical spectra in Fig. 3 were measured at low strainamplitude (~0.1%). To assess the thermal and mechanical lability ofthe allo domains, we measured the strain dependence of the dynamicmodulus at various temperatures (Fig. 4). At low temperatures,well below the glass transition temperature of the allodomains, there is a marked effect of strain, the storage modulusdecreasing for strains exceeding ca. 1%. This result indicates thatdeformation disrupts the hard domain structure. This phenomenon,the Payne effect, is well known for rubbery polymers reinforcedwith hard particles. For particulate fillers the strainassociated with a modulus decrement falls in the range from ca.1e100%, increasing for lower concentrations of particles [29,33].The energy loss associated with breakup of the structure gives riseto a peak in the loss modulus (not shown). The block copolymer
การแปล กรุณารอสักครู่..
