Dissertation > Excellent graduate degree dissertation topics show

Studies on the Preparations and Damping Performances of Polyurethane Hollow Fiber Damping Materials

Author: WangYunYing
Tutor: LiMingJun
School: Nanchang University of Aeronautics and
Course: Environmental Engineering
Keywords: Polyurethane Hollow fiber Blends Damping properties
CLC: TB535.1
Type: Master's thesis
Year: 2010
Downloads: 112
Quote: 2
Read: Download Dissertation

Abstract


Based on the hollow structure on the vibration has a good cushioning properties, and the first damping material of the hollow fiber made of a polyurethane (PU) in order to improve the damping performance. The wet spinning the preparation of hollow fiber damping material technology and the corresponding parameters of the mechanical properties and dynamic mechanical properties of polyurethane-based hollow fiber damping material. By controlling the process parameters of the hollow fiber spinning, the to study spinning conditions the performance of the hollow fiber, the following conclusions: (1) the damping material of the polyurethane hollow fiber by wet spinning process successfully prepared under suitable conditions. (2) With the increase of the extrusion velocity, diameter and wall thickness of the hollow fiber will be increased correspondingly. (3) within the scope of the study, as the polymer concentration increases, the tensile strength and elongation of the hollow fibers increases, decreases and the porosity will be. (4) The blend hollow fibers are easily spun, but the performance of the hollow fiber will change. Blend of polyacrylonitrile (PAN), polysulfone (PSF), polyvinylidene fluoride (PVDF), which will decrease the tensile strength and Young's modulus, elongation, and porosity will increase. The hollow fibers of the blend of polyvinyl chloride (PVC), its porosity and the elongation becomes small, while the tensile strength and Young's modulus will be good. Add a hindered phenol (AO-60), and tri-hydroxy-methane (TMP) 8190PU/PVC hollow fiber, the tensile strength and Young's modulus will be worse, and the elongation rate with respect to good, and after the heat treatment of the AO -60 PVC Blends are prepared hollow fiber properties are superior to those without overheating treatment AO-60 of the hollow fiber. By the damping properties of the damping material of the polyurethane-based hollow fiber, the following conclusions: (1) the impact of polyurethane models: the 8190PU hollow fiber loss factor of 0.3, is less than the loss factor of the hollow fibers under the same conditions 8195PU is 0.33, while 8190PU the storage modulus ratio of the hollow fibers under the same conditions 8195PU large. (2) solid content of 8190PU the hollow fibers: The solids content of the damping properties of the 24% of the hollow fiber is preferably, loss factor can reach 0.68. (3) By comparing the experimental found that under the same conditions, the loss factor of the damping material of the hollow structure is 0.68, the storage modulus of more than 3000MPa; while the loss factor of the damping material of the flat structure is 0.28, the storage modulus of less than 300MPa, described hollow structural damping material performance is superior to the performance of the damping material of the plate structure. (4) blends group into the PAN, PSF, PVDF and PVC blend hollow fiber, the storage modulus and loss factor than 8190PU hollow fiber is low, the glass transition temperature change is little. (5) AO-60 is added, it is possible to improve 8190PU/PVC system loss factor, storage modulus and glass transition temperature. AO-60 AO-60 after heat treatment than the untreated improve the storage modulus of the blend system and the glass transition temperature phenomenon becomes more apparent. TMP on 8190PU/PVC system damping properties biggest impact is to improve the glass transition temperature of the system. Modified nano-TiO2 8190PU hollow fiber loss factor is small, but larger storage modulus and the glass transition temperature of the system can improve.

Related Dissertations

  1. Study on Fusion Characteristic and Mineral Change of Blends of Sludge and Coal,X703
  2. Synthesis and Biocompatibility of different types of hydrophilic surface - modified polyurethane,R318.08
  3. Hydrophilic structure of different types of surface -modified polyurethane material and coagulation 12 factor nine peptide fragments,and fibrinogen P1 fragment of computer simulation of the interaction,O631.3
  4. Research on PSA/Cotton Blend Fabric of Coatinging of Water Resistance and Moisture Permeability,TS195.6
  5. Prototype Development of Intimate Apparel Mannequin,TS941.2
  6. Synthesis and Properties of the new anti-clotting material in modified ammonium phosphate zwitterion,R318.08
  7. Preparation and Application of Water-based Polyurethane to Improve Wet Rubbing Fastness,TS193.2
  8. The Modification of Polypropylene by Melt Grafting and Blending and Its Fatigue Resistance,TQ325.14
  9. The Synthesis and Properties Research of High Hydrophilic Polyurethane,TQ323.8
  10. Non-phosgene Synthesis of Polyurethane Elastomer,TQ334.1
  11. Performance of Starch-based Surfactant and Its Application Research in Detergent,TQ423
  12. UV-curable waterborne polyurethane acrylate oligomers,TQ630.1
  13. Study on Preparation and Characterization of Polyvinyl Chloride Coated Polyester Multifilament,TQ342.2
  14. The Study on Controllable Preparation and Performance of Polyurethane Nano-fiber/net,TB383.1
  15. Study on the Crystallinity of Plla/Pdla Blends,O631.3
  16. Evaluation of Biocompatibility of Titanium Alloy Coating by Polyurethane,R318.08
  17. Waste of wool blends of cellulose dissolution and research,TS131
  18. Study of Concentrated Seawater Flue Gas Desulphurization by Membrane Absorption,X701.3
  19. Study on Preparation of Aqueous Polyurethane Dispersion and Application on Shrink-resisting of Wool,TS195.5
  20. Research on the Heat-resistant UV Curable Waterborne Polyurehane Coatings,TQ630.7
  21. PVC / ASA / DOP blends structure and properties of,TQ325.3

CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use > Vibration isolation, damping materials and structures
© 2012 www.DissertationTopic.Net  Mobile