The chemical structure has a great influence on the performance of fluoropolymers, so it is very necessary to fully characterize the chemical structure in the process of designing new polymers. Alfa Chemistry Fluoropolymers can provide customers with detailed chemical analysis services. The analysis and determination contents of fluoropolymer composition and structure include monomer composition, terminal structure, sequence structure, degree of branching/crosslinking, relative molecular weight and distribution, and condensed structure.
|Analysis Contents||Test Methods|
|Monomer composition||Nuclear magnetic/sequential resonance, infrared/Raman/ultraviolet/fluorescence spectroscopy, photoelectron spectroscopy, pyrolysis chromatography-mass spectrometry, elemental analysis (organic elemental analysis, ion chromatography), etc.|
|End structure||Nuclear magnetic resonance, infrared spectroscopy, photoelectron spectroscopy, etc.|
|Sequence structure||Nuclear magnetic resonance, infrared spectroscopy, photoelectron spectroscopy, pyrolysis chromatography-mass spectrometry|
|Branching/cross-linking degree||Gel permeation chromatography, infrared spectroscopy, nuclear magnetic resonance, chemical reaction method, rheological method|
|Relative molecular weight and distribution||Gel permeation chromatography, solution light scattering method, viscosity method, laser light scattering method, osmotic pressure method, melt rheological behavior, graded precipitation method|
|Condensed matter structure||XRD, DSC, various microscopes, etc.|
For insoluble fluoropolymers, solid-state NMR is the best choice for analyzing its composition and structure.
Determine the molecular structure of small molecules and macromolecules.
Test the molecular weight and distribution of polymers.
Test the electronic transition behavior of molecules, and can perform qualitative and quantitative analysis of some organic compounds, inorganic salts, etc.
It can measure the vibration-rotation behavior of molecules of substances in gas, liquid, solid, and viscous fluid states, and obtain molecular spectrum characteristic spectra. Can perform qualitative and quantitative analysis of some compounds.
Used to characterize various polymers and composite materials that cannot be analyzed by traditional methods.
Used for phase qualitative analysis, phase quantitative analysis, crystal structure analysis, stress analysis.
Figure 1. The polymerization of TFE
The rigid spiral polymer chain of PTFE is easy to crystallize, resulting in its crystallinity as high as 98%. It also causes PTFE to have a higher melting temperature and a higher melt viscosity, which also makes it difficult to process PTFE with traditional polymer processing methods. In addition, due to the compact crystal structure and dense fluorine atoms, PTFE is the heaviest polymer material with a density of 2.1 g/cm3.
Figure 2. The polymerization of CTFE
Compared with PTFE, only one fluorine atom in PCTFE is replaced by chlorine. The introduction of chlorine atoms in the polymer structure interrupts the crystallization ability of the polymer backbone. PCTFE has lower crystallinity, lower melting temperature, better intermolecular interaction and better mechanical properties. An important advantage of PCTFE is its melt processability.
If you have any services of interest, you are welcome to contact us to discuss the solutions that best suit your requirements.
※ Please kindly note that our services are for research use only.