Low-Frequency Vibrational Density of States of Nanophase-Separated Poly(n‑alkyl methacrylate)s: Confined Phonons and Relationship to Specific Heat
Paulina Szymoniak, Fanni Juranyi, Margarita Kruteva, Reiner Zorn, Andreas Schönhals
TL;DR
This paper studies how the structure of certain polymers affects their low-frequency vibrations and specific heat, finding a link between these properties.
Contribution
The study reveals a linear relationship between the Boson peak frequency and specific heat anomaly temperature in nanophase-separated polymers.
Findings
The Boson peak shifts to higher frequencies with increasing alkyl side chain length in PnMAs.
A linear relationship is found between the Boson peak frequency and the specific heat capacity anomaly temperature.
Calculated specific heat capacity from vibrational density of states agrees qualitatively with experimental results.
Abstract
This study investigates the low-frequency vibrational density of states of nanophase-separated poly(n-alkyl methacrylate)s (PnMAs) and its relationship to specific heat. This system undergoes a nanophase separation for n > 1 in alkyl side chain-rich domains and a backbone-rich matrix. Using inelastic neutron scattering, the low-frequency vibrational density of states (Boson peak, BP) of PnMAs with varying alkyl side chain lengths (methyl, butyl, hexyl, and octyl) is measured. The results reveal that the BP shifts to higher frequencies with increasing side chain length reaching a maximum. This result indicates a counterbalance of confinement effects and the scattering of the matrix. The behavior of the Boson peak of the PnMAs is compared to other nanophase-separated systems, such as Janus-polynorbornenes and hexakis(n-alkyloxy)triphenylene discotic liquid crystals. The study also…
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Taxonomy
TopicsMaterial Dynamics and Properties · Thermodynamic properties of mixtures · Mechanical and Optical Resonators