A method based on thermogravimetry/differential scanning calorimetry for the forensic differentiation of latex gloves

Causin, Valerio; Marega, Carla; Marigo, Antonio; Carresi, Pietro; Guardia, Vittorio Della; Schiavone, Sergio

doi:10.1016/j.forsciint.2009.03.014

Cited by 17 publications

(14 citation statements)

References 20 publications

(28 reference statements)

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“…As a term of comparison, the discrimination procedure based on TG-DSC had a DP of 99%. 11 However, TD-NMR has a very critical advantage in a forensic science perspective: different from TG-DSC, NMR relaxometry is non destructive, allowing to replicate the experiments during all the steps of the investigations and of the trial in Court. On the other hand, in order to achieve the large DP of 99%, TG-DSC exploits 18 variables, and it requires to perform a double set of experiments, one in nitrogen atmosphere and the other in air, wasting a fairly big amount of sample.…”

Section: Resultsmentioning

confidence: 99%

“…One of the authors of this paper recently published a characterization procedure centred on thermal analysis for the forensic differentiation of latex gloves. 11 Latex is historically associated with a highly regular cis-1,4-polyisoprene produced by more than four hundred different species of plants. The term is currently used to indicate colloidal dispersions of the polymer microphases in a liquid, as well as the film that is produced by removing the liquid itself.…”

Section: Introductionmentioning

confidence: 99%

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A method based on time domain nuclear magnetic resonance for the forensic differentiation of latex gloves

Mauri

Causin

et al. 2011

Anal. Methods

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Latex gloves are employed by felons who want to avoid shedding fingermarks or biological traces, and are sometimes discarded on the crime scene or nearby. Comparison between the gloves found at the crime scene and those seized in the suspect's premises can provide useful information to investigators. This paper proposes the use of 1H time domain nuclear magnetic resonance (TD-NMR) as a method for performing such a comparison. Two parameters can be quantified by this technique: the proton weight fraction, which is correlated to the chemical nature and formulation of the material, and the relaxation time T2, which is a measure of polymer chain dynamics. Both these features can be ultimately associated to differences in raw materials, formulation and processing of the gloves, thereby offering a means to discriminate items which are indistinguishable by visual examination. TD-NMR, without sample preparation and preserving the integrity of the specimen, allows differentiating 88% of the possible pairs of samples in a population of 20 latex gloves. TD-NMR data are complementary to those coming from thermal analysis

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A method based on time domain nuclear magnetic resonance for the forensic differentiation of latex gloves

Mauri

Causin

et al. 2011

Anal. Methods

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“…Besides, the DTA pattern, quantified the part of the exothermic and endodermic part yielded the enthalpies associated with the thermal phenomena of the materials. A small endothermic around 210 ℃ of the medical glove is the melting point stage of the PVC polymers which officially know that in the range of 100 to 260 ℃ depending on the manufacturer additives (Causin et al 2009). The endothermic peak around 431 ℃ for glove plastic polymer is observed.…”

Section: Thermogravimetric Analysis and Thermal Propertiesmentioning

confidence: 99%

Current plastics pollution threats due to COVID-19 and its possible mitigation techniques: a waste-to-energy conversion via Pyrolysis

2021

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Background The extensive use and production of PPE, and disposal in the COVID-19 pandemic increases the plastic wastes arise environmental threats. Roughly, 129 billion face masks and 65 billion plastic gloves every month are used and disposed of on the globe. The study aims to identify the polymer type of face masks and gloves and sustainable plastic waste management options. Results The identification of polymers, which can help for fuel conversion alternatives, was confirmed by FTIR and TGA/DTA analysis and confirms that the polymeric categories fit for the intended purpose. Moreover, the handling technique for upcycling and the environmental impacts of the medical face mask and glove were discussed. The FTIR result revealed that face masks and gloves are polypropylene and PVC thermoplastic polymer, respectively and they can be easily transformed to fuel energy via pyrolysis. The endothermic peaks around 431 ℃ for medical glove and 175 ℃ for surgical is observed tells that the melting point of the PVC and polypropylene of plastic polymers, respectively. The pyrolysis of the face mask and glove was carried out in a closed reactor at 400 ℃ for 1 h. Conferring to lab-scale processes, liquid, and wax fuel rate of 75%, char of 10%, and the rest non-condensable gases were estimated at the end. Conclusions It can be concluded that the medical plastics can be recycled into oil due to their thermoplastics nature having high oil content and the waste to energy conversion can potentially reduce the volume of PPE plastic wastes.

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“…Very few forensic applications of this method were reported [129,130]. Ihms and Brinkman were the first to explore the potential of TGA for the forensic discrimination of polymeric items [129].…”

Section: Characterisation Of Other Additivesmentioning

confidence: 99%

“…These authors had the analysis of blast fragments and arson debris in mind, but in principle the technique can be applied whenever necessary. A few years later, TGA was applied to the discrimination of latex gloves [130].…”

Section: Characterisation Of Other Additivesmentioning

confidence: 99%

Polymers on the Crime Scene

Causin

2015

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A method based on thermogravimetry/differential scanning calorimetry for the forensic differentiation of latex gloves

Cited by 17 publications

References 20 publications

A method based on time domain nuclear magnetic resonance for the forensic differentiation of latex gloves

A method based on time domain nuclear magnetic resonance for the forensic differentiation of latex gloves

Current plastics pollution threats due to COVID-19 and its possible mitigation techniques: a waste-to-energy conversion via Pyrolysis

Polymers on the Crime Scene

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