Dissertation > Excellent graduate degree dissertation topics show

Using X-ray diffraction techniques to characterize the crystallization of polyethylene film distribution

Author: BaiShaSha
Tutor: ChengFengMei
School: Changchun University of
Course: Polymer Chemistry and Physics
Keywords: Grazing incident X-ray diffraction polyethylene thin film penetration depth 3D crystalline structure
CLC: TQ320.721
Type: Master's thesis
Year: 2010
Downloads: 83
Quote: 0
Read: Download Dissertation

Abstract


Linear Low Density Polyethylene (LDPE) thin film is a kind of widely used film, which can be made by blowing method and casting method. During processing, tensile caused by traction will affect crystalline structure of thin film and then affect the film performance. Because the cooling rate of polyethylene in the surface and inert of thin film is different, crystalline structure will be different in the surface and inert of thin film, which will affect the film performance. However this is not well studied due to the lack of characterization method. The appearance of grazing incident X-ray diffraction (GIXRD) brings a new chance for such kind of study. GIXRD is a novel kind of method for thin film. By varying the incident angle it can detect the crystalline structure in different depth. Here we use GIXRD to study the crystalline structure distribution in PE thin film.Experiment using transmission X-ray diffraction method to obtain film in the stretching direction of structural information and found that the molecular chain along the long axis direction (horizontal) orientation. Polyethylene film showings in the role of the crystal axis stretching more along the stretch direction of orientation in the polyethylene film in the presence of spherulite deformation occurred, and the majority of the molecular chain in order to horizontally arranged.The use-of-plane grazing incidence X-ray diffraction analysis of polyethylene film thickness direction of the crystal structure of the distribution. With silver mirror reflected in the PE film deposition of Ag film side, respectively, in a different incident angle on the silver polyethylene film X-ray diffraction results show that when the incidence angle of 0.6°when the X-rays can penetrate thin film, and the use of an ideal smooth plane derived formulas to calculate the results of trend. Shows using this formula for approximate calculation is possible. The study also shows that as the angle increases, the crystallinity and grain size has continued to grow, indicating the thickness of the film is not fully consistent with the direction of crystallization, PE film inside and outside the crystal is also inconsistent.We studied the 3D crystalline structures of PE thin film by using out-of plane and in-plane Synchrotron GIXRD. The results show that the 3D crystalline structures of PE thin film are different in the surface and inert. The PE in the surface has higher crystallinity degree and smaller crystallites size.

Related Dissertations

  1. The Magnetic Properties of Pr-doped YBa2Cu3O7-δ Single Crystals and Grain-aligned Hg0.8Pb0.2Ba1.5Sr0.5Ca2Cu3Oy,TM26
  2. Study on Sewage Treatment with Yellow Soil-Clay Soil Double Layer Land Treatment System,X703
  3. The Research on Deresination of Furniture Material Masson Pine’s Lumber with Solvent Distillation Method,TS62
  4. Optical Properties of Nanometer Metal Thin Films,O484.41
  5. Study on Technology of Interlayer Treatment for Perpetual Asphalt Pavement,U416.217
  6. Computing Methods of the Equivalent Stiffness of the Interior Bracing and the Penetration Depth in Rock of Rock-Socketed Piles for Deep Excavation,TU476
  7. Preparation and Performance Study of the Full-degradable Polythene Films,TQ320.721
  8. Preparation of Polysulfonate Ultrafiltration Membrane and Application on Oil Decolorization,TQ320.721
  9. Preparation and Properties of PMP Hollow Fiber Membranes,TQ320.721
  10. Cation Membrane by Radiation Grafting of Halogenated Styrene onto FEP Films,TQ320.721
  11. Studies on Preparation of iPP Hollow Fiber Microporous Membrane via Thermally Induced Phase Separation,TQ320.721
  12. Study on Preparation and Properties of Polymer/Inorganic Water-soluble Nano Blend Plastic Film by Intercalation,TQ320.721
  13. Study on the Preparation and Blend Modification of Polyethersulfone Hollow-Fibre Membrane,TQ320.721
  14. Study on the Surface Modification and Its Properties of Ldpe Film,TQ320.721
  15. Preparation of PI/SiO2 Nano-hybrid Film by Sol-gel Process and Study on Its Structure and Properties,TQ320.721
  16. Developing of BOPP-D1 Product of BOPP Film Material,TQ320.721
  17. Study on Preparation and Formation Mechanism of PVDF Ultrafiltration Membranes,TQ320.721
  18. Research on Processing Arts and Equipment of Biaxially Oriented Polyvinyl Fluoride,TQ320.721
  19. Study on the Effect of SiO2 Nanoparticles on PVDF Ultrafiltration Membranes and the Mechanism,TQ320.721
  20. Preparation of Novel Thermo-and pH-sensitive Membranes by Surface Photo-grafting Polymerization,TQ320.721

CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > General issues > Products and testing > Various shapes of products > Film
© 2012 www.DissertationTopic.Net  Mobile