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Abstract(s)
No Ć¢mbito da unidade curricular DissertaĆ§Ć£o/EstĆ”gio (DISEST) do segundo ano do Mestrado em Engenharia QuĆmica, ramo de Energia e Biorrefinaria do Instituto Superior de Engenharia do Porto (ISEP), com a parceria da empresa Monteiro, Ribas IndĆŗstrias S.A na unidade Monteiro Footwear, desenvolveu-se um trabalho onde se pretendeu avaliar a incorporaĆ§Ć£o da casca de arroz e da raspa de couro wet-white em solas para sapatos, de forma a criar um produto de cariz sustentĆ”vel, do ponto de vista da biodegradaĆ§Ć£o e do seu desempenho mecĆ¢nico. Nesse sentido, foi produzida uma matriz base para solas de sapatos (Base 180.000), onde foram adicionados casca de arroz e raspa de couro wet-white respetivamente, na proporĆ§Ć£o de 40 % (m/m). Estes trĆŖs produtos foram sujeitos a um ensaio de biodegradaĆ§Ć£o, pelo mĆ©todo da compostagem acelerada durante 42 dias, sendo depois efetuados ensaios mecĆ¢nicos (dureza, resistĆŖncia ao rasgamento, resistĆŖncia Ć abrasĆ£o, tensĆ£o de rotura e alongamento na rotura), perda de massa, calorimetria diferencial de varrimento (DSC) e observaĆ§Ć£o por microscopia Ć³tica invertida, antes e apĆ³s a biodegradaĆ§Ć£o. Analisando os resultados obtidos, pĆ“de-se constatar que a sola contendo couro wet-white foi aquela onde foi observada a maior perda de massa com 11%, face aos 5% da sola com casca de arroz e 3% da Base 180.000. No que respeita aos resultados em DSC, verificou-se que a adiĆ§Ć£o de couro wetwhite apresentava uma variaĆ§Ć£o significativa dos valores da temperatura de onset antes e apĆ³s ensaio de biodegradaĆ§Ć£o. Sobre a sola contendo a casca de arroz, nĆ£o se observou uma alteraĆ§Ć£o significativa. No que se refere aos ensaios mecĆ¢nicos, apĆ³s a biodegradaĆ§Ć£o, observou-se em geral uma diminuiĆ§Ć£o nos valores dos parĆ¢metros mecĆ¢nicos, desde logo na Base 180.000 onde se verificou uma diminuiĆ§Ć£o significativa, em particular nos parĆ¢metros do alongamento e da tensĆ£o de rutura, com uma diminuiĆ§Ć£o superior a 40%. No caso da mistura com o couro wet-white, os valores aproximaram-se daqueles obtidos pela Base 180.000, ou seja, com a degradaĆ§Ć£o do couro wet-white esta sola torna-se numa sola mais lisa e mais suave ao toque. No que toca Ć mistura com a casca de arroz, observou-se uma sola bastante abrasiva, desintegrĆ”vel e sem capacidade de deformaĆ§Ć£o antes e apĆ³s o ensaio de biodegradaĆ§Ć£o.
Within the scope of Dissertation/Internship, module inserted for masterās degree completion in Chemical Engineering, branch of Energy and Biorefining at ISEP, with the partnership of Monteiro, Ribas IndĆŗstrias S.A in the Monteiro Footwear unit, work was carried out to evaluate the incorporation of rice husk and wet-white leather in shoe soles, in order to create a sustainable product from the point of view of biodegradation and its mechanical performance. In this sense, a base matrix for shoe soles was produced (Base 180.000), where rice husk and wet-white leather scraps were added respectively, in the proportion of 40% (w/w). These three products were subjected to a biodegradation test, through the accelerated composting method for 42 days. The extent of biodegradation of the shoe soles was evaluated through mechanical tests, such as hardness, tear and abrasion resistance, tensile strength and elongation at break, as well as weight loss, differential scanning calorimetry (DSC) and microscope observation. Analyzing the results obtained, we observed that the sole containing wet-white leather was the one who had the most weight lost, with 11% compared to 5% of the rice husk sole and 3% of the Base 180.000. In regards of the DSC results, we have found that the addition of wet-white leather presented a significant change on the onset temperature, before and after biodegradation. On the sole containing rice husk, no significant change was observed. Regarding the mechanical tests, after biodegradation overall, we have observed a decrease in mechanical parameters. In the Base 180.000 sole, we have verified a 40% decrease in the tensile strength as well as elongation at break. In the case of the sole with wet-white leather, the decrease was similar to the first one, in other words, with the degradation of the wet-white leather, this sole has become smoother and softer to the touch. As for the rice husk sole, we have observed a very abrasive, crumbled and with no deformiting capacity sole, either before or after biodegradation.
Within the scope of Dissertation/Internship, module inserted for masterās degree completion in Chemical Engineering, branch of Energy and Biorefining at ISEP, with the partnership of Monteiro, Ribas IndĆŗstrias S.A in the Monteiro Footwear unit, work was carried out to evaluate the incorporation of rice husk and wet-white leather in shoe soles, in order to create a sustainable product from the point of view of biodegradation and its mechanical performance. In this sense, a base matrix for shoe soles was produced (Base 180.000), where rice husk and wet-white leather scraps were added respectively, in the proportion of 40% (w/w). These three products were subjected to a biodegradation test, through the accelerated composting method for 42 days. The extent of biodegradation of the shoe soles was evaluated through mechanical tests, such as hardness, tear and abrasion resistance, tensile strength and elongation at break, as well as weight loss, differential scanning calorimetry (DSC) and microscope observation. Analyzing the results obtained, we observed that the sole containing wet-white leather was the one who had the most weight lost, with 11% compared to 5% of the rice husk sole and 3% of the Base 180.000. In regards of the DSC results, we have found that the addition of wet-white leather presented a significant change on the onset temperature, before and after biodegradation. On the sole containing rice husk, no significant change was observed. Regarding the mechanical tests, after biodegradation overall, we have observed a decrease in mechanical parameters. In the Base 180.000 sole, we have verified a 40% decrease in the tensile strength as well as elongation at break. In the case of the sole with wet-white leather, the decrease was similar to the first one, in other words, with the degradation of the wet-white leather, this sole has become smoother and softer to the touch. As for the rice husk sole, we have observed a very abrasive, crumbled and with no deformiting capacity sole, either before or after biodegradation.
Description
Keywords
BiodegradaĆ§Ć£o Compostagem Base Casca de arroz Couro wetwhite Biodegradation Composting Rice husk Wet-white leather