Identification of different type of polymers in plastics waste

The main goal of this work was to develop and test advanced techniques for the instant identification of different type of polymers in post-consumer plastics. In order to accomplish this task, infrared (IR), X-ray diffraction (XRD), differential scanning calorimetric (DSC) and laser induced breakdow...

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Published inJournal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Vol. 43; no. 11; pp. 1303 - 1310
Main Authors Siddiqui, Mohammad N., Gondal, Mohammad A., Redhwi, Halim H.
Format Journal Article
LanguageEnglish
Published England Taylor & Francis Group 01.09.2008
Subjects
analytical techniques
Bottles
Calorimetry, Differential Scanning
Differential scanning calorimetry
DSC
Glass transition temperature
identification of plastics
Infrared radiation
Lasers
LIBS
Plastics - chemistry
Plastics waste
Polyethylenes
Polymers - chemistry
Polypropylenes
Polystyrene resins
Polyvinyl chlorides
Spectrophotometry, Infrared
waste management
Wastes
X-Ray Diffraction
XRD
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Summary:The main goal of this work was to develop and test advanced techniques for the instant identification of different type of polymers in post-consumer plastics. In order to accomplish this task, infrared (IR), X-ray diffraction (XRD), differential scanning calorimetric (DSC) and laser induced breakdown spectroscopic (LIBS) techniques were applied. The following six model plastics were identified in this study. Low-density polyethylene (LDPE), High-density polyethylene (HDPE), Polypropylenes (PP), Polystyrene (PS), Polyethylene terephthalate (PET) and Polyvinyl chloride (PVC) along with few randomly selected plastics waste such as water bottle and cap, water cups, yogurt container and coke bottle were studied. IR has shown the fingerprinting of polymer types present in plastics waste. The XRD analysis helps to provide characteristic spectral lines whose intensities vary with the type of each constituent polymer. The DSC method provided the different crystalline melting temperature, glass transition, and onset temperature for the peaks and the percent crystallinity data single out different polymers. The ratio of LIBS signals intensities of carbon and hydrogen atoms were employed for the finger printing of the different family of plastics. The combined use of IR, XRD, DSC and LIBS techniques yielded very useful and effective results for plastic waste management.
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ISSN:1093-4529
1532-4117
DOI:10.1080/10934520802177946