O consumo colaborativo como alternativa ao consumo de massa: a percepção do consumidor em bairros de Florianópolis e a relação do consumo colaborativo com valores pessoais.

TCC (graduação) - Universidade Federal de Santa Catarina. Centro Sócio-Econômico. Economia.O tipo de consumo que a sociedade habituou-se ao longo das últimas décadas tem ocasionado problemas que impactam diretamente o cotidiano das pessoas. Alavancado por motivações individuais e questões ambientais, sociais e econômicas, o consumo colaborativo é um fenômeno recente que vem alterando o funcionamento da economia global ao proporcionar aos consumidores uma nova forma de acomodar seus desejos e necessidades de maneira conveniente e sustentável. Associado a isso, as redes de informação energizadas pela Internet têm modificado significativamente o modo e a velocidade com que os agentes econômicos se relacionam. Nesse sentido, o objetivo maior deste trabalho de conclusão do Curso de Ciências Econômicas é identificar a percepção dos consumidores da Grande Florianópolis acerca do consumo colaborativo como alternativa ao modelo de consumo tradicional. O estudo é dividido em três partes principais. Inicialmente recorre-se a pesquisa bibliográfica para contextualizar e conceituar os termos economia compartilhada e consumo colaborativo, suas formas e princípios. Visando conhecer os efeitos desse movimento no Brasil e especificamente em Florianópolis, na sequencia realiza-se pesquisa através de questionários para identificar a propensão do consumidor a participar de práticas de consumo colaborativo em quatro regiões: Lagoa da Conceição, Centro, Trindade e Continente. Considerando que os valores pessoais interferem no comportamento do consumidor, busca-se avaliar qualitativamente de que forma tais valores se relacionam com a disposição dos mesmos a participar do consumo colaborativo. Através do questionário aplicado, ainda que com amostra limitada, observa-se que os consumidores apresentam de modo geral nível satisfatório de propensão a participar do consumo colaborativo, sendo a Lagoa da Conceição a localidade com maior adesão, seguida por Continente, Trindade e Centro. Além disso, a mensuração dos valores pessoais permite observar que os consumidores mais abertos a mudança, menos conservadores e menos apegados materialmente apresentam maior propensão a participar do consumo colaborativo, como é o caso da Lagoa da Conceição. As considerações finais discutem os principais achados e limitações do estudo

Direct Observation of C–H Cyclopalladation at Tertiary Positions Enabled by an Exo-Directing Group

Here we describe the first preparation of tertiary alkyl palladium complexes via C–H activation. Enabled by an exo-type oxime directing group, cyclopalladation occurred smoothly at the bridgehead position. Treatment of the resulting complex with iodine led to C–H iodination at the methine carbon. This study provides important mechanistic information for palladium-catalyzed functionalization of methine C–H bonds

Catalytic Functionalization of Unactivated sp³ C–H Bonds via <i>exo</i>-Directing Groups: Synthesis of Chemically Differentiated 1,2-Diols

We describe a Pd-catalyzed site-selective functionalization of unactivated aliphatic C–H bonds, providing chemically differentiated 1,2-diols from monoalcohol derivatives. The oxime was employed as both a directing group (DG) and an alcohol surrogate for this transformation. As demonstrated in a range of substrates, the C–H bonds β to the oxime group are selectively oxidized. Besides activation of the methyl groups, methylene groups (CH₂) in cyclic substrates and methine groups (CH) at bridge-head positions can also be functionalized. In addition, an intriguing oxidative skeleton rearrangement was observed using the menthol-derived substrate. The use of <i>exo</i>-directing groups in C–H activation, as illustrated in this work, would potentially open doors for the discovery of new transformations and new cleavable DGs

Catalytic <i>Ortho</i>-Acetoxylation of Masked Benzyl Alcohols via an <i>Exo</i>-Directing Mode

A Pd-catalyzed <i>ortho</i>-acetoxylation of masked benzyl alcohols to synthesize various 2-hydroxyalkylphenol derivatives is reported. The 2,6-dimethoxyl benzaldoxime proved to be an efficient <i>exo</i>-type directing group for arene (<i>sp</i>²) C–H functionalization. Two strategies were demonstrated to remove the directing group through N–O and C–O bond cleavages. A high catalyst turnover (>1000) was obtained to illustrate the practicality of this method

Phase-Changing Bistable Electroactive Polymer Exhibiting Sharp Rigid-to-Rubbery Transition

A phase-changing polymer comprising stearyl acrylate and a long-chain urethane diacrylate was studied as a new bistable electroactive polymer. The abrupt and reversible phase transition of the crystalline aggregates of the stearyl moieties results in a rapid shift between the rigid and rubbery states of the polymers during temperature cycles. The transition temperature is tunable between 34–46 °C. A storage modulus change of ∼1000 fold can be obtained within a narrow temperature range of 10 °C. The polymer shows excellent shape memory properties with both fixation rate and recovery rate close to 100%. Diaphragm actuators based on the polymer thin films were electrically actuated up to 70% strain at 50 °C. The actuated shape can be “frozen” after the films were allowed to cool below the transition temperature. This rigid-to-rigid deformation is refreshable and repeatable via the rigid-to-rubbery transition and electrical actuation in the rubbery state

Silver Nanowire Percolation Network Soldered with Graphene Oxide at Room Temperature and Its Application for Fully Stretchable Polymer Light-Emitting Diodes

Transparent conductive electrodes with high surface conductivity, high transmittance in the visible wavelength range, and mechanical compliance are one of the major challenges in the fabrication of stretchable optoelectronic devices. We report the preparation of a transparent conductive electrode (TCE) based on a silver nanowire (AgNW) percolation network modified with graphene oxide (GO). The monatomic thickness, mechanical flexibility, and strong bonding with AgNWs enable the GO sheets to wrap around and solder the AgNW junctions and thus dramatically reduce the inter-nanowire contact resistance without heat treatment or high force pressing. The GO-soldered AgNW network has a figure-of-merit sheet resistance of 14 ohm/sq with 88% transmittance at 550 nm. Its storage stability is improved compared to a conventional high-temperature annealed AgNW network. The GO-soldered AgNW network on polyethylene terephthalate films was processed from solutions using a drawdown machine at room temperature. When bent to 4 mm radius, its sheet resistance was increased by only 2–3% after 12 000 bending cycles. GO solder can also improve the stretchability of the AgNW network. Composite TCE fabricated by inlaying a GO-soldered AgNW network in the surface layer of polyurethane acrylate films is stretchable, by greater than 100% linear strain without losing electrical conductivity. Fully stretchable white polymer light-emitting diodes (PLEDs) were fabricated for the first time, employing the stretchable TCE as both the anode and cathode. The PLED can survive after 100 stretching cycles between 0 and 40% strain and can be stretched up to 130% linear strain at room temperature

Site-Selective Carbene-Induced C–H Functionalization Catalyzed by Dirhodium Tetrakis(triarylcyclopropanecarboxylate) Complexes

Three types of dirhodium tetrakis­(tri­aryl­cy­clo­pro­pane­car­boxy­late) complexes were generated and shown to adopt disparate high-symmetry structures. These catalysts were evaluated in the intermolecular C–H functionalization of an array of terminally substituted <i>n</i>-alkanes and displayed various site-selectivity as a function of catalyst and substrate structure, which could be correlated through quantitative relationships

Site-Selective Carbene-Induced C–H Functionalization Catalyzed by Dirhodium Tetrakis(triarylcyclopropanecarboxylate) Complexes

Three types of dirhodium tetrakis­(tri­aryl­cy­clo­pro­pane­car­boxy­late) complexes were generated and shown to adopt disparate high-symmetry structures. These catalysts were evaluated in the intermolecular C–H functionalization of an array of terminally substituted <i>n</i>-alkanes and displayed various site-selectivity as a function of catalyst and substrate structure, which could be correlated through quantitative relationships