A study is presented of the effect of empty space scattering in the estimation of the lattice thermal conductivity of four
samples of polyethylene with different degrees of crystallinity at temperatures between 0.4 and 20 K. This study was performed
by considering different values of the empty space fraction. It is found that empty space scattering plays a very important
role in the calculation of the lattice thermal conductivity of semicrystalline polymers.