1,721,127 research outputs found
Polymers on the crime scene: Forensic analysis of polymeric trace evidence
No full textThis book approaches the analysis of forensic contact traces from a polymer science perspective. The development of characterization methods of new or unusual traces and the improvement of existing protocols is described. The book starts with a general introduction to polymers and the issues related to transfer, persistence and recovery of polymeric traces. The chapters present a distinctive feature of polymers, discussing how it can be measured, what the practical difficulties which can be encountered in the analysis, and how useful that information is for comparison or identification purposes. Practical tips for the realization of the forensic analyses are included
Approaching forensic analysis from a polymer science perspective: the measurement of the molecular weight of polymeric trace evidence
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Getting the full picture: the role of small-angle X-ray scattering in the elucidation of structure-property relationships in nanocomposites SAXS
No full textNanocomposites based on biodegradable polymers and nanofibers for structural and functional applications
No full textPolymers on the crime scene: How can analytical chemistry help to exploit the information from these mute witnesses?
No full textPolymers are ubiquitous in everyday life, so it is very likely that they may be encountered on a crime scene as well. In order to exploit to the fullest extent the amount of information that these items contain, it is necessary to properly characterise them. The state of the art and the most recent advances in the forensic characterisation of polymeric items are presented. The qualitative and quantitative determination of the formulation is discussed, along with more innovative approaches, that focus on the features directly related to the macromolecular nature of such traces (molecular weight, degree of crystallinity, presence of comonomers, etc.)
Effect of a structural modification of the bipyridinium core on the phase behaviour of viologen-based bistriflimide salts
No full textWe report on the synthesis and characterization of novel viologen-based low-melting salts of bistriflimide, namely 1,1′-di-n-alkyl-2,2′,6,6′-tetramethyl-4,4′-bipyridinium, with lateral alkyl chains of 8, 10 and 12 carbon atoms. The thermotropic behaviour has been fully characterized by polarized optical microscopy, X-ray scattering and calorimetric measurements. Comparison with literature data shows that the increase of the effective volume of the rigid bipyridinium core, obtained by methylation, has a dramatic effect on the phase behaviour and on the transition temperature to the isotropic liquid. DFT calculations of the energy and structure of model clusters provide useful insights to interpret the experimental findings
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