and the Debye level $A_\mathrm{D} = 3/\omega_\mathrm{D}^3$ (triangles) as functions of the strength of bending rigidity $\varepsilon_\mathrm{bend}$. The chain length is (a) $L=50$ and (b) $L=3$. The values of $\omega_\mathrm{D}$ and $A_\mathrm{D}$ are calculated from the elastic moduli of $K$ and $G$ that are presented in Fig. \[fig3\]. The arrows indicate values of atomic LJ glasses that are taken from Ref. [@Shimada:2018fp]. ](fig5.pdf){width="48.00000%"}

![\[fig6\] [Scaled vibrational spectra.]{} We present the data presented in Fig. \[fig4\], in the scaled form: we scale the reduced vDOS $g(\omega)/\omega^2$ and the frequency $\omega$ by the Debye level $A_\mathrm{D}$ and the Debye frequency $\omega_\mathrm{D}$. Here the values of $A_\mathrm{D}$ and $\omega_\mathrm{D}$ are presented in Fig. \[fig5\]. The chain length is (a) $L=50$ and (b) $L=3$. The color of line indicates the value of bending rigidity $\varepsilon_\mathrm{bend}$ according to the color bar. Black lines present value of the LJ glass which is taken from Ref. [@Shimada:2018fp]. ](fig6.pdf){width="48.00000%"}

![\[fig7\] [Localization nature of vibrational states.]{} Plots of participation ratio $P^k$ as a function of the scaled frequency $\omega/\omega_\mathrm{D}$, for several different bending rigidities of $\varepsilon_\mathrm{bend}$. The chain length is (a) $L=50$ and (b) $L=3$. The color of line indicates the value of bending rigidity $\varepsilon_\mathrm{bend}$ according to the 