Dynamics of the "Strong" Polymer of n-Lauryl Methacrylate below and above the Glass Transition

摘要: Dielectric spectroscopy (DS) and dynamic light scattering (DLS) are employed to study the dynamics of poly(n-lauryl methacrylate) (PnLMA) (M w = 1.1 x 10 5 ) at temperatures below above glass transition temperature T g (T 225 K). The DS DLS data show no evidence for splitting between primary (α-) secondary (β-) relaxations within experimental frequency range. main process affecting is mixed αβ-relaxation which bears similarities a single α-process with regard T-dependence relaxation times. Excellent agreement two sets times was found. distribution exhibits pronounced dependence : from Kohlrausch-Williams-Watts (KWW) exponent β KWW 0.25 1 + 100 K about MHz. PnLMA therefore, our knowledge, only polymer Debye (β 1) megahertz frequencies so far. extremely broad near weak normalized time apparently contradict phenomenologically established correlation in many formers. This contradiction might arise concentration fluctuations long alkyl chain can broaden spectrum . In addition β-process, fast β-relaxation be resolved both experiments originates polyethylene-like chain.