Mechanical, electrical and electro-mechanical properties of thermoplastic elastomer styrene–butadiene–styrene/multiwal carbon nanotubes composites

Composites of styrene–butadiene–styrene (SBS) block copolymer with multiwall carbon nanotubes were processed by solution casting to investigate the influence of filler content, the different ratios of styrene/butadiene in the copolymer and the architecture of the SBS matrix on the electrical, mechanical and electro-mechanical properties of the composites. It was found that filler content and elastomer matrix architecture influence the percolation threshold and consequently the overall composite electrical conductivity. Themechanical properties aremainly affected by the styrene and filler content. Hopping between nearest fillers is proposed as the main mechanism for the composite conduction. The variation of the electrical resistivity is linear with the deformation. This fact, together with the gauge factor values in the range of 2–18, results in appropriate composites to be used as (large) deformation sensors.

Amadeus, Papa e Greve no Natal

O direito constitucional à greve está consagrado no art. 57º da Constituição. Desde que estejam assegurados os serviços mínimos – indispensáveis às necessidades sociais impreteríveis -, o direito à greve é absolutamente inalienável e não pode ser coarctado por uma qualquer “requisição civil”, em conjugação com o art. 18º/2 da Constituição; The constitutional right to strike is enshrined in art. 57 of the Constitution. Provided they are guaranteed the minimum services - indispensable to essential social needs - the right to strike is absolutely inalienable and can not be inhibited by any "civil requisition", in conjunction with art. 18/2 of the Constitution.

1º DE MAIO e SISTEMA FISCAL

A segurança no emprego está consagrada no art. 53º da CRP: “É garantida aos trabalhadores a segurança no emprego, sendo proibidos os despedimentos sem justa causa ou por motivos políticos ou ideológicos”. É também a celebração dum ambiente de trabalho humano em que sejam consagrados os direitos e deveres fundamentais dos trabalhadores, como o direito e dever à saúde laboral e a uma jornada justa de horas de trabalho, o direito e o dever ao descanso, o direito e o dever a formar família, ter filhos e ter tempo para a mesma, o direito e o dever a fazer o próprio trabalho e executar as diferentes tarefas pelas quais está encarregue. § Job security is enshrined in art. 53 of CRP, "is guaranteed to security workers in employment, the redundancies being prohibited without just cause or for political or ideological reasons." It is also the celebration of a human working environment in which the fundamental rights and duties of workers are enshrined, as the right and duty to labor health and a fair day's working hours, the right and the duty to rest, the right and the duty to form families, have children and take time for it, the right and the duty to do the work itself and perform the different tasks for which it is responsible.