Title page for etd-1220112-141329


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URN etd-1220112-141329
Author Ying-Lin Yeh
Author's Email Address kevin.8097@hotmail.com
Statistics This thesis had been viewed 5569 times. Download 1177 times.
Department Materials and Optoelectronic Science
Year 2012
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Preparation and Characterization of Nitrate Ester Plasticized Polyether for Propellant Binder
Date of Defense 2012-07-23
Page Count 67
Keyword
  • NEPE
  • binder
  • polyurethane
  • tensile test
  • Abstract Polyurethane network binders were synthesized using polyethylene glycol (PEG) prepolymers, cellulose acetate butyrate (CAB), curative [Desmodur N100 (N100) or Desmodur N3200 (N3200)], and catalyst [dibutyltin dilaurate (DBTDL)]. Triacetin (TA) was added as plasticizer before the reaction. Polyurethanes were prepared by varying the molar ratio of –NCO/-OH, weight ratio of TA/PEG, molecular weight of PEG, the amount of catalyst, the order of adding catalyst and curative, and the stirred time. Synthesized polyurethanes were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), tensile tests, and swelling tests to study their reaction, degradation, thermal, and mechanical properties. When the ratio of –NCO/-OH was between 1.2 and 1.4, polyurethane gave the best mechanical properties. Additionally, the quenched polyurethane had a lower degree of crystallinity When the weight ratio of TA and PEG was bigger than 2, crystallization of polyurethane could be minimized during the tensile testing or after quenching. In this study, it was found that PEG with molecular weight of 4000 yielded the best mechanical properties. These results indicate that better and uniform mechanical properties can be obtained by using enough stirring time via varying the amount of catalyst and adding catalyst before curing agent.
    Advisory Committee
  • Feng-Er Yu - chair
  • Shih-Fu Lu - co-chair
  • Ming Chen - advisor
  • Files
  • etd-1220112-141329.pdf
  • Indicate in-campus at 2 year and off-campus access at 2 year.
    Date of Submission 2012-12-20

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