Boson peak of self-healable polymers: terahertz time-domain spectroscopy and low-temperature specific heat measurement

We investigated the vibrational density of states (VDOS) of self-healable polymers in the terahertz region by terahertz time-domain spectroscopy and low-temperature specific heat measurement. The VDOS determined from the low temperature specific heat measurements showed the boson peak (BP) at about 0.6 THz. The BP in the absorption coefficient (α(ν)) also appeared in α/ν² plot. Regarding the determinant of the BP frequency of the system of self-healable polymers, it is located between hydrogen-bonded glasses and van der Waals glasses.