Development of Qualitative and Quantitative Analysis Methods in Pharmaceutical Application with New Selective Signal Excitation Methods for 13C Solid-State Nuclear Magnetic Resonance Using 1H T1rho Relaxation Time

2013 ◽  
Vol 102 (1) ◽  
pp. 154-161 ◽  
Author(s):  
Mamiko Nasu ◽  
Takayuki Nemoto ◽  
Hisashi Mimura ◽  
Kazuhiro Sako
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Relaxation Time ◽  
Quantitative Analysis ◽  
Solid State ◽  
Magnetic Resonance ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
Pharmaceutical Application ◽  
Analysis Methods ◽  
Nuclear Magnetic

scholarly journals The Use of Solid State NMR to Characterize High Density Polyethylene/Organoclay Nanocomposites

2009 ◽  
Vol 3 (3) ◽  
pp. 187-190
Author(s):  
Tathiane Rodrigues ◽  
◽  
Maria Tavares ◽  
Igor Soares ◽  
Ana Moreira ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Relaxation Time ◽  
Solid State ◽  
Magnetic Resonance ◽  
High Density Polyethylene ◽  
Melt Processing ◽  
Proton Spin ◽  
High Density ◽  
Spin Lattice Relaxation ◽  
Nuclear Magnetic

Recently the development of new materials, in special polymeric nanocomposites, formed by polymer and layered silicates, have gained attention. In this work nanocomposites based on high-density polyethylene matrix (HDPE) and organically modified clay were prepared by melt processing and characterized by the determination of proton spin-lattice relaxation time through solid state nuclear magnetic resonance (NMR) spectroscopy. This work has a proposal to add one quantitative technique to help the researchers to better evaluate polymeric nanocomposite, because NMR is an important tool employed to study both molecular structure and dynamic molecular behavior. The nanocomposites were mixed in a twin-screw extruder, varying the shear rate parameter: 60 and 90 rpm at 463 K. Nanocomposites obtained were characterized through X-ray diffraction; thermal analysis; impact resistance and nuclear magnetic resonance. The T1H results showed that the samples present different molecular domains according to the clay dispersion, forming an intercalated and/or exfoliated nanocomposites. The measurement of relaxation time, using low field NMR, is a useful method to evaluate changes in the molecular mobility of nanocomposite and can infer whether the sample is exfoliated and/or intercalated, since lamellar filler is used.

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