Assessing Mechanochemical Properties of Acrylonitrile Butadiene Styrene (ABS) Items in Cultural Heritage Through a Multimodal Spectroscopic Approach.

A multimodal spectroscopic approach is proposed to correlate the mechanical and chemical properties of plastic materials in art and design objects, at both surface and subsurface levels, to obtain information about their conservation state and to monitor their degradation. The approach was used to investigate the photo-oxidation of acrylonitrile butadiene styrene (ABS), a plastic commonly found in many artistic and design applications, using ABS-based LEGO bricks as model samples. The modifications of the chemical and viscoelastic properties of ABS during photoaging were monitored by correlative Brillouin and Raman microspectroscopy (BRaMS), combined with portable and noninvasive broad-range external reflection infrared (IR) spectroscopy and nuclear magnetic resonance (NMR) relaxometry, directly applicable in museums.

Unveiling the composition of historical plastics through non-invasive reflection FT-IR spectroscopy in the extended near- and mid-Infrared spectral range.

The present research exploits the strengths of external reflection FT-IR spectroscopy to non-invasively study heritage plastic objects through inspection, for the first time, of the wide spectral range including the near- and mid-IR (12500-350 cm). Unlike most of previous works on historical plastic objects, reflection-mode spectra were not corrected for the unfamiliar surface reflection profiles to the more recognizable absorption-like band shapes. This avoided data misinterpretation due to ill-suited Kramers Krönig correction when volume reflection is also present or when highly absorbing IR compounds generate Reststrahlen bands.

Plastics in Heritage Science: Analytical Pyrolysis Techniques Applied to Objects of Design.

The first synthetic polymers were introduced as constituents of everyday life, design objects, and artworks at the end of the 19th century. Since then, the history of design has been strictly connected with the 20th century evolution of plastic materials. Objects of design from the 20th century are today a precious part of the cultural heritage.

Epidemiological profile of public servants absent from work due to mental disorders from 2010 to 2013.

Objective: Describe the epidemiological profile of mental and behavior disorders (MBD) of public servants in the State of Santa Catarina, which resulted in workers providing medical certificates, between 2010 and 2013.

Method: A descriptive cross-sectional study with a quantitative approach, performed from data provided by the State Secretary of Administration. All medical certificates classified as in Chapter V of ICD-10 - Group "F" - Mental and Behavioral Disorders (MBD) were considered for analysis in the period.

Moral harassment at work model and inability.

Moral Harassment at Work (MHW) is considered a recurrent practice of humiliation, mockery, isolation, persecution and psychological torture. Its results go beyond the worker private life: represent financial loss, affects the work, the organization, the productivity and the society. This article aims to develop a model of MHW, which characterizes the main components of the phenomenon and their nexus with the inability to work.