Dissertation > Excellent graduate degree dissertation topics show

Formation of PVB-ZrO2 Hybrid Films for Laminated Glass

Author: ZhangRuoNan
Tutor: WangYiMin
School: Donghua University
Course: Materials Science
Keywords: Polyvinyl butyral (PVB) Zirconia （ZrO2） Organic-inorganic hybrid composites Sol-Gel process Thermal/mechanical properties Laminated glass
CLC: TB383.2
Type: Master's thesis
Year: 2012
Downloads: 235
Quote: 0
Read: Download Dissertation

Abstract


Poly(vinyl butyral)(PVB), prepared from polyvinyl alcohol by the reaction with butyraldehyde in the presence of small amounts of mineral acid, is widely used as the film sandwiched in the laminated glass owing to its merits, such as sturdiness, flexibility and great adhesiveness with glass as well as the high impact strength at low temperature. However, compared with these properties, heat-resistance of PVB is not so outstanding, which could be the main reason leading to PVB mechanical weakness in higher temperature range. Plasticized PVB is widely used for commercial laminated glass. Addition of plasticizer also generates decrease of glass transition temperature of pure PVB. Meanwhile, thermal and mechanical properties of PVB are also determined by the presence of butyral, hydroxyl and acetyl groups. Zirconium dioxide (ZrO2) is a kind of inorganic material which has high heat-resistance and strength, thus this research aims to improve thermal/mechanical properties of four types of PVBs by adding ZrO2 nanoparticles through sol-gel method and produce high-performance laminated glass experimentally using the improved PVBs-ZrO2 hybrid films as an interlayer film. Here four types of PVB, PVB60H, Plasticized PVB60H, PVB60HH and PVB60T, of which H, HH and T indicate the degree of acetalization, T being the lowest while HH being the highest. Hybrid films were tested by DMA (Dynamic Mechanical Analysis), TMA (Thermal Mechanical Analysis), tensile tests and experimental laminated glasses were measured by transmittance test and impact resistance test.DMA results showed that glass transition temperature Tg of PVB edged up monotonically with increasing vinyl alcohol (hydroxyl groups) content:Tg of HHZ-10 containing 12-16 wt% polyvinyl alcohol bottomed out at around 90℃, while Tg of TZ-10 topped at around 98℃, of which the polyvinyl alcohol content doubled than the former one. Plasticizer reduced the Tg of PVBs while both adding certain amount of ZrO2 particles into PVBs and annealing process under high temperature could effectively escalate the Tg and residual storage modulus of PVBs. TMA results showed that the diminishing absolute value of expansion coefficient of hybrid material could be increased by one or two orders of magnitudes as high by adding ZrO2 particles to form stronger crosslinking with the hydroxyl groups of PVBs. Increasing ZrO2 content and annealing temperature (100℃for plasticized PVB60H-ZrO2,130℃for PVB60H-ZrO2, PVB60HH-ZrO2 and PVB60T-ZrO2) contributed to increasing Young’s modulus along with simultaneous decline of elongation at break. Better adhesiveness together with appropriate balance between tensile strength and elongation at break could improve the impact resistance of laminated glass. Adding 2.5-10 wt% of ZrO2 at high annealing could maintain even improve the impact resistance of PVBs laminated glass. With great balance between tensile strength and elongation at break, laminated glass sandwiching PVB60HH-ZrO2 (ZrO2 content 2.5/5/10 wt%) exhibited great impact resistance topped by laminated glass with plasticized PVB60H-ZrO2 (ZrO2 content 2.5/5 wt%) annealed at 100℃. Adulterating certain amount of ZrO2 (2.5-10 wt%) doesn’t cause optical performance deterioration. The transmittance of plasticized PVB60H-ZrO2 films was 3-5% lower than that of PVB60HH-ZrO2, PVB60T-ZrO2 and PVB60H-ZrO2. In the ultra-violet zone of 200-400nm, PVB60H-ZrO2 and plasticized PVB60H-ZrO2 were UV-resistant while the UV light transmittance of PVB60HH and PVB60T reached to 60-80% which need to be solved by adding functional inorganic particle in further study.

Related Dissertations

  1. Fabrication and Electric-Magnetic Properties Study of Composite Multiferroic Material CoFe2O4-BaTiO3,TQ174.756
  2. Study on Sol-gel Preparation and Photocatalytic Activity of Titanium Dioxide Potocatalyst,O643.36
  3. The Character Optimization of Nano-Crystalline SrTiO3 Capacitor Voltage-Sensitive and the Research of Double Function Devices,TM54
  4. Preparation of PZT Ferroelectric Thin Films by Sol-Gel Processing,TB383.2
  5. Synthesis and Characterization of Aerogels and Nanoparticles Using Supercritical Fluids,TB383.1
  6. PLZT Patterned Films Prepared by Direct Patterning Process and Their Properties,TB383.2
  7. Study on the Preparation and Properties Characaterization of PLLA/SA Blends,TQ320.6
  8. Ultraviolet organic modified siloxane Sol-Gel process,TB322
  9. Structure and Electric Properties of the PZT/CCTO Multilayer Thin Films,TB383.2
  10. Preparation and Properties of tungstate - based phosphor,TQ422
  11. Preparation and Characterization of ZrO2/Polymer Hybrid Materials,O631
  12. Mesoporous Silica: Synthesis, Morphology Control, Assembly, and Property,O613.72
  13. Miniemulsion Polymerization and Its Application in Preparation of Polymer Nanocomposite,TQ174.1
  14. Research on Bearing and Deflecting Capacity of Point-Supported Glass Plate,TU382
  15. Point supported glass curtain wall glass panel mechanical analysis and engineering applications,TU382
  16. Synthesis and Structure Control of Submicron Silica Solid Foam,O613.72
  17. Study on the Process and Properties of Perovskite Type Ceramic Coatings Prepared by Sol-Gel Method,TG174.453
  18. Study on SiO2/Epoxy Resin Hybrid Materials by Means of Sol-Gel,TQ323.5
  19. Preparation of CM-β-CD（P）-TiO2 Hybrid Materials and Study on Their Photocatalytic Properties,O643.36
  20. Preparation of ZnO Thin Films and Studied on Their Properties,TN304.21
  21. New Ni nanowire / SiO_2 composite airgel preparation, structure and properties of,TB383.1

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile