Influence of Annealing on Structure of Nylon 11
Citations Over Time
Abstract
Differential scanning calorimeter (DSC), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and density techniques have been used to investigate the structural parameters of the solid state of Nylon 11 annealed at different temperatures. The equilibrium heat of fusion Δ and equilibrium melting temperature were estimated to be 189.05 J g-1 and 202.85 °C respectively by using the Hoffman−Weeks approach. The degree of crystallinity (Wc,x) ranged approximately 24−42% was calculated by WAXD and compared with those by calorimetry (Wc,h) and density (Wc,d) measurements. The radius of gyration Rg, crystalline thickness Lc, noncrystalline thickness La, long period L, semiaxes of the particles (a, b), electron-density difference between the crystalline and noncrystalline regions ηc− ηa, and the invariant Q increased with increasing annealing temperature. The analysis of the SAXS data was based upon the particle characteristic function and the one-dimensional electron-density correlation function. An interphase region existed between the crystalline and noncrystalline region with a clear dimension of about 2 nm for semicrystalline Nylon 11. Instead of the traditional two-phase model, a three-phase model has been proposed to explain these results by means of SAXS.
Related Papers
- → The subdomain structure of human serum albumin in solution under different pH conditions studied by small angle X-ray scattering(1995)85 cited
- → LabDisk for SAXS: a centrifugal microfluidic sample preparation platform for small-angle X-ray scattering(2016)45 cited
- → SAXS and WAXS investigations of the crystallinity in polymers(1990)31 cited
- → SAXS Investigation of ABC Triblock Star Terpolymers in Aqueous Solution(2004)4 cited
- → Small-angle X-ray scattering from 12-arm star polystyrene fractions in MEK(1986)9 cited