Dissertation > Excellent graduate degree dissertation topics show

Spectral Study for Reaction Mechanism of Etherification of Rice Straw

Author: HuangZuo
Tutor: WangLinShan
School: Northeastern University
Course: Applied Chemistry
Keywords: Straw Cellulose Modification Mechanism Infrared Spectroscopy CP / MAS 13C NMR spectroscopy X-ray diffraction
CLC: TQ320.1
Type: Master's thesis
Year: 2008
Downloads: 47
Quote: 1
Read: Download Dissertation

Abstract


In this study, the etherification reaction to Straw be chemically modified to convert it to a certain thermoplastic polymer materials . NaOH as a swelling agent and catalyst , epichlorohydrin and benzyl chloride as an etherifying agent , cetyl bromide as a phase transfer catalyst ( for debenzylation modified) , and toluene as the solvent , the straw the etherification modified its microscopic structure has changed considerably , partly to eliminate the polarity of the straw . In this study, the rate of weight gain , infrared spectroscopy , solid CP / MAS 13C NMR spectroscopy and X -ray diffraction method of combining the analysis process and reaction mechanism of epichlorohydrin modified straw and benzyl chloride modified straw modified and research . Epichlorohydrin modified straw modification time of 1-8h modified straw weight gain rate , the results show that the growth rate increases with increasing modification time , modified straw first gain within 5h The heavy rate steadily increased to 90.12% , 5h after weight gain rate basically stable at about 93.00% . Infrared spectra and solid-state 13C nuclear magnetic resonance spectra compared before and after the modification , as well as different modified time of the infrared spectra inferred epichlorohydrin etherification straw modification reaction process is divided into two steps : The first step is broken C-Cl bond , substituted cellulose on the one-OH H ; second step is substituted into the cellulose on the epoxy ring is opened, the reaction with the cellulose molecule on another one-OH . Finally, using X-ray diffraction analysis straw modified before and after the crystallization degree of change, the lower the degree of crystallinity of the modified rice straw . For the benzyl chloride modified straw , of the modified time for the 1-10h of the weight gain rate trends and infrared spectra analysis of the modification time and modification effect relationship . The results show that the modified 1-2h , weight gain rate is substantially 0.00%; modified 3-8h , weight gain rate is increased with increasing modification time , the highest weight gain rate when 8h , 61.37% ; modified time for 9-10h , the rate of weight gain decreased. Consistent with the results observed in the IR spectrum . Reaction 2h benzyl group of samples infrared spectroscopy FIG no characteristics of a benzyl group of functional corporation 's absorption peak appears , from 4h sample of IR spectroscopy FIG start appear the characteristics of a benzyl group of functional corporation 's absorption peak , 8H sample of the benzyl group of characteristics absorption peak up to its peak strongest .

Related Dissertations

  1. Investigations of Structure and Glass Forming Abilty of Amorphous Alloys,TG139.8
  2. The Environmental-Friendly Method and Process of Removing Non-Cellulosic Matters from Bamboo for Textile Fiber,TS652
  3. Study on the Simulation of Agricultural Non-point Source Pollution in Huaihe River Basin in Henan Provice,X52
  4. Effects of Fermentive Cornstalk Culture Medium Mixture Ratio on Physical and Chemical Characters in Potted Peony,S685.11
  5. Studies on the Process and Facilities of Straw-Excrement Ferment Technology for Biogas and Biological-Organic Compound Fertilizer,S141
  6. The Study of Oat Straw Mixed Ensilage with Tall Fescue or Perennial Ryegrass in Tibet,S816.53
  7. The Effectr of Lactic Acid Bacteria and Rice Bran on Dynamic Change of Rice Straw Silage Fermentation,S816.53
  8. Study on Fuel Supply of Henan Straw Power Generation,TM619
  9. Trial Research on the Small Straw Burying and Mud-liquid Mixing Equipment for the Machine of Straw Back into Field Using in Paddy Field,S224.29
  10. Design and Experimental Reserch on the Returning Straw Fertilizer Drill,S223.25
  11. Research on the Evaluation of Straw Resource and the Development of Scale-Up Straw Energy Utilization in Jiangsu Province,S38
  12. Greenhouse Gases Emissions from Different Rotation Systems in Paddy Fields,S511
  13. Effects of Soil C/N with Increasing Compost Wheat Straw on the Carbon and Nitrogen Metabolism and the Quality of Flue-cured Tobacco Leaves,S572
  14. Monitoring Leaf Nitrogen Status in Rice with Near Infrared Spectroscopy,S511
  15. The Effects of Isoflavones in Soybean Straw on the Growth and meat Quality of Goat,S826.5
  16. Effects of Added Maize Straw and Citric Acid on Cu and Cd Availability in Soil,X131.3
  17. QTL Mapping and Inherit Analysis of Protein and Ligin Content of Soybean Green Straw,S816
  18. Effects of Adding Brewer’s Grains on Fermentation Quality of Mixted Ensilage with Crop Straw and By-Products,S816.53
  19. Study on Dynamic Relationship between Labile Soil Organic C, N and Crop Growth under Straw Incorporation,S158
  20. Study on Effects of Straw Channel-Buried Returning in Rice-Wheat Rotation Field,S141.4
  21. Studies on the Restoration Technology of Severe Alkali-Saline Grassland in Dorbod Heilongjiang Province,S156.4

CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > General issues > Basic theory
© 2012 www.DissertationTopic.Net  Mobile