Again assuming
complete swelling, the dry volume fractions of 10% HMBP and 20%
CBP becomes 76% and 52%, respectively, which would explain why
the 10% HMBP has a higher shear modulus than the 20% CBP sample.
The addition of particles with an inhomogeneous size distribution
does not seem to influence the rheological properties different
than a homogeneous size distribution as there is no difference between
4% Bpulp and 4% HMBP.