The nanostructures during the tensile drawing of poly(ethylene terephthalate)(PET)/hexadecyl triphenyl phosphonium bromide montmorillonite(PMMT) nanocomposites were studied by in-situ small angle x-ray scattering. For strain higher than the yield point, the scattering intensity increases dramatically due to the nucleation and growth of nanovoids and crystals. The nanovoids and crystals are significantly dependent on the heating temperature. The effective filling of PMMT in the PET matrix provokes a strong restriction to the long period. The peaks of the long period disappear gradually with the deformation strain increasing from 0% to 34%.
A Mythen detector has been equipped at the beamline 4B9 A of Beijing Synchrotron Radiation Facility(BSRF),which is expected to enable BSRF to perform time-resolved measurement of X-ray diffraction(XRD) full-profiles.In this paper,the thermal expansion behavior of metal indium has been studied by using the in-situ XRD technique with the Mythen detector.The indium was heated from 303 to 433 K with a heating rate of 2 K/min.The in-situ XRD full-profiles were collected with a rate of one profile per 10 seconds.Rietveld refinement was used to extract the structural parameters.The results demonstrate that these collected quasi-real-time XRD profiles can be well used for structural analysis.The metal indium was found to have a nonlinear thermal expansion behavior from room temperature to the melting point(429.65 K).The a-axis of the tetragonal unit cell expands with a biquadratic dependency on temperature,while the c-axis contracts with a cubic dependency on temperature.By the time-resolved XRD measurements,it was observed that the[200]preferred orientation can maintain to about 403.15 K.While(110) is the last and detectable crystal plane just before melting of the polycrystalline indium foil.This study is not only beneficial to the application of metal indium,but also exhibits the capacity of in-situ time-resolved XRD measurements at the X-ray diffraction station of BSRF.
Rong DuZhongJun ChenQuan CaiJianLong FuYu GongZhongHua Wu
