| Author | Message | |||
     Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 70 Registered: 9-2001 |
Thomas - Anything you get as a commercial product is liable to have additives. I think your best chance to get pure material would be to go the plastics manufacturers and tell them what you need and why you need it. If they have it you can probably get a sample, so it won't cost anything. If they don't have it, then you'll have to use what's available; on the other hand that's likely to be more nearly reprsentative of what you'll be measuring on actual plastics you come across. Howard \o/ /_\ | |||
| thomas ricour (tricour) Member Username: tricour Post Number: 15 Registered: 2-2006 |
Dear all, I try to find a pure scan of PET (polyethylene terephtalate) in NIR (1100/2300 nm) and also of PE, PVC, at room temperature on pellets or packaging. Does someone can help me. All my scans are made with plastics not pure. Waiting for help. | |||
| Renato Guchardi (guchardi) New member Username: guchardi Post Number: 2 Registered: 1-2001 |
Hi Venkynir, These are absorbance spectrum. As you said reflectance is more complicated. I am sending the reflectance spectrum to your e-mail. Renato | |||
| venkatarman (venkynir) Senior Member Username: venkynir Post Number: 36 Registered: 3-2004 |
Renato Can you spell out the detail of the detector and signal processing / acquiring method along with VCO tracking of your AOTF spectrometer .We have procured AOTF (parts like VCO and x'tal from M/s Brimrose) , we are unable to get good signal in reflectance mode. | |||
| thomas ricour (tricour) Member Username: tricour Post Number: 14 Registered: 2-2006 |
Thanks Howard. The problem i ordered it by mail, but i think they'll only send me a copy in couple of days. I need it urgently. Do you have a copy of it to be send by mail or fax. email: [email protected] kind regards Thomas | |||
| Renato Guchardi (guchardi) New member Username: guchardi Post Number: 1 Registered: 1-2001 |
Hi Thomas, I built a AOTF NIR spectrophotometer in my Master Science and use PET to the wavelength calibration.
Best regards, Renato | |||
| Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 69 Registered: 9-2001 |
Thomas - BTW, I assumed you were talking about the Spectroscopy article. \o/ /_\ | |||
| Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 68 Registered: 9-2001 |
Thomas - here's a list of the spectra in it: Mylar Styrene Styrene-butadiene Styrene-acrylonitrile Polyvinyl chloride Polyvinylidene chloride Polyvinylidene fluoride Polypropylene Polybutylene Polymethylpentane Polyethylene terephthalate Polyethereetherketone Acrylic Cellulose acetate Cellulose butyrate Polyphenylene sulfide Polyarylate Polyarylsulfone Styrene-maleic anhydride copolymer Nylon Polycarbonate Polyetherimide Epoxy PET Glycol The main caveat, I'd say, is that the spectra are relatively small, with 2 spectra across the width of the page, so that will limit the precision with which you can determine the absorption peaks. On the other hand, several of the key peaks are identified, and there is a table of peak maxima included. BTW - check with Advanstar: if they have back issues available, it may be cheaper to get the whole issue than the single article. If you have problems, contact me & I'll see what I can do for you. \o/ /_\ | |||
| thomas ricour (tricour) Member Username: tricour Post Number: 13 Registered: 2-2006 |
Thanks Howard, but before i buy the article, are you sure i can find typical spectra of polymers (PET, PVC...) inside? Thomas | |||
| Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 67 Registered: 9-2001 |
Thomas - you'll find spectra of several different types of polymers in: "Qualitative Analysis of Thin-Film Polymer Samples Using Near-IR Spectroscopy for Recycling Applications"; Castro, P. and Mark, H.; Spectroscopy; 9(1) p.27-32 (1994) There's also a somewhat larger collection in volume 2 of: "Handbook of Organic Compounds", J. Workman, Jr., Academic Press (2001) Howard \o/ /_\ | |||
| thomas ricour (tricour) Junior Member Username: tricour Post Number: 10 Registered: 2-2006 |
Thanks gab, I try now to make a short trial of NIR AOTF possibilities on analysis of PET, PVC, etc... I need to know maximum informations about typical spectra, peaks,etc... Thanks for your help. Thomas | |||
| Gavriel Levin (levin) Senior Member Username: levin Post Number: 30 Registered: 1-2006 |
Hi Thomas, Sorry I am so late about it, was moving around too much. To your questions - 1. Polymers can be done by NIR, any technology of NIR, provided you can go to at least 1900nm, to cover well all the C-H possiblities. Stopping before 1700nm is not a good idea because of the important C-H absorptions beyond 1700. 2. I am not sure what you mean by carbon - if you are refering to the black sheet that you can find in many industrial type carpeting than it can be and many times is PVC loaded with black carbon. The black carbon in the PVC is a very strong absorber, and absorbs almost all NIR energy, across the spectrum. It is difficult to get meaningful spectrum out of it, so if that what you mean by carbon, then it is not a good way to go. 3. Acetaldehyde, or similar compounds all have at least one C-H bond and will respond nicely yo NIR analysis, regardless of the technology. I hope this answers your questions, Gabi Levin Brimrose | |||
| venkatarman (venkynir) Intermediate Member Username: venkynir Post Number: 18 Registered: 3-2004 |
Nylon could be analyzed through NIRS. But I have doubt in a Carbon .The acetaldehyde bond structure helps me to give answer to you questions. | |||
| thomas ricour (tricour) Junior Member Username: tricour Post Number: 9 Registered: 2-2006 |
Hello, I would be interested if someone already analysed polymers under powder and components as NYLON, Carbon, Acetaldehyde... by NIR or FTIR. What is for you the possibility of both technics. I want to know if someone have already done it and what were his success and goals. Waiting for your comments Kind regards Thomas |
