Studies on Thermo-Mechanical Properties of Post-Consumer High Impact Polystyrene in Five Reprocessing Steps

Santana, Ricardo Costa de; Manrich, Sati

doi:10.1177/147776060201800202

Cited by 20 publications

(29 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 8 shows the impact strength results for PP, HIPS, and the composites filled with RT (10% wt). In the case of PP a higher amount of the impact energy is absorbed compared with HIPS, as expected since the HIPS is a rigid material with a glass transition temperature [23] above room temperature (it should be noted that for the PP it was necessary to use a pendulum of 11 J, greater than that of 2.75 J used for the HIPS and the composites).…”

Section: Mechanical Propertiesmentioning

confidence: 80%

“…Although this contains polybutadiene, the content is generally less than that of RT (10% wt), so the greater rigidity corresponds to the polystyrene [23,28] . Regarding the influence of the particle size of the RT in the mixture, in general, there was a decrease in the amount of impact energy absorbed with increasing RT particle size from <500 to 500-1000 µm.…”

Section: Impact Strengthmentioning

confidence: 99%

“…The melt flow rate of the materials was measured at 230 °C with a load of 2.16 kg for mixtures containing PP and at 190 °C with a load of 5 kg for mixtures with HIPS. Seven tests were performed for each material to provide better accuracy [22,23] . The morphology analysis of the fracture surface of the PP/RT, HIPS/RT and (PP/HIPS)/RT composites after the tensile tests was carried out using a scanning electron microscope (SEM), model Philips XL 20.…”

Section: A Rmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of the Effect of the Incorporation of Rubber Tire Waste Particles on the Properties of PP, HIPS and PP/HIPS Matrices

Montagna¹,

Bento²,

Silveira³

et al. 2013

Polímeros

View full text Add to dashboard Cite

Abstract:In recent years, the consumption of plastics has been increasing and as consequence, the waste generated has also increased. Rubber tire (RT) waste is another residue which causes significant problems to society. In view of the considerable amounts of RT waste generated, this study aimed to evaluate the influence of the incorporation of RT particles into post-consumer thermoplastic matrices such as polypropylene (PP), high impact polystyrene (HIPS) and PP/HIPS blends and the modification of the physical, morphological, rheological and mechanical properties. The particle sizes of the RT used were <500 and 500-1000 µm. The RT content was 10% w/w and the weight ratio for the PP/HIPS blend was 4/1, with processing by injection molding. The results showed that the smaller (500 µm) particle size led to a decrease in the melt flow rate (MFR) of the PP/RT composites (increased viscosity) and an increase for the HIPS/RT composites. On the other hand, the larger particles (1000 µm) led to a decrease in the mechanical performance of the PP/RT and HIPS/RT blends when compared with the neat polymers (PP and HIPS post-consumer). The observed decrease in the mechanical properties of these composites was due to weak filler/matrix interactions, which can be visualized in images by scanning electron microscopy (SEM) of the fracture surface after tensile testing.

show abstract

Section: Mechanical Propertiesmentioning

confidence: 80%

Section: Impact Strengthmentioning

confidence: 99%

Section: A Rmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of the Effect of the Incorporation of Rubber Tire Waste Particles on the Properties of PP, HIPS and PP/HIPS Matrices

Montagna¹,

Bento²,

Silveira³

et al. 2013

Polímeros

View full text Add to dashboard Cite

show abstract

“…A degradação por processamento mecânico tem provado causar alterações no comportamento reológico e nas propriedades mecânicas do ABS e HIPS; estas alterações podem ser devido à cisão da cadeia da fase PS e modificações na estrutura física da fase borracha [23] . Santana et al [24] avaliaram a reciclabilidade do HIPS em 5 reprocessamentos por injeção e como isso refletia na suas propriedades termo-mecânicas. Os resultados revelaram que o efeito da degradação da reciclagem consecutiva sobre as propriedades térmicas do HIPS são baixas e pode ser considerada desprezível.…”

Section: Introductionunclassified

“…Esta sequência de processos pode provocar a degradação do material, por exemplo, reduzir o seu peso molecular uma vez que as cadeias poliméricas são submetidas a temperaturas elevadas, a tensões mecânicas, a luz, entre outros [24] . Todos estes fatores, ou seja, o tipo de polímero, o seu processamento original, a degradação prévia do material e o tipo de processamento a ser utilizado na reciclagem irão influenciar na qualidade do produto reciclado.…”

Section: Introductionunclassified

Reciclagem de Carcaças de Monitores: Propriedades mecânicas e morfológicas

Gabriel¹,

Grochau²,

Santana³

et al. 2013

Polímeros

View full text Add to dashboard Cite

Resumo: A substituição da tecnologia CRT (cathode ray tube) utilizada em televisores e monitores, há mais de 60 anos, pelas novas tecnologias de Plasma, LCD (liquid crystal display) e LED (light-emitting diode) tem gerado grande quantidade de resíduos. Não existem estatísticas oficiais da quantidade de resíduos gerados no Brasil, contudo, para alguns países, como os EUA, a China e Taiwan, estimam-se descartes anuais de 3,2 milhões, 5 milhões e 1 milhão de televisores e monitores, respectivamente. Os monitores são compostos por polímeros, metais e cerâmicas, incluindo alguns materiais tóxicos. Este trabalho está focado na caracterização e reciclagem da carcaça polimérica dos monitores CRT. Foram coletados monitores danificados ou obsoletos e as carcaças foram separadas por marca, caracterizadas, cominuídas e injetadas para obter corpos de provas para os ensaios mecânicos. A caracterização mostrou que as carcaças, independentemente da marca, utilizam o mesmo material polimérico, o ABS (Acrilonitrila Butadieno Estireno). Os resultados dos ensaios mecânicos apresentaram variações nas diferentes marcas, provavelmente por possuírem composições diferenciadas. Esta variação também foi verificada analisando a superfície de fratura dos corpos de prova após o ensaio de tração. Com base nos resultados pode-se concluir que o material reciclado apresentou desempenho mecânico satisfatório, viabilizando tecnicamente a sua reciclagem. Palavras-chave: Monitor CRT, carcaça polimérica, reciclagem mecânica. Recycling of Frames of Monitors: Mechanical and Morphological PropertiesAbstract: The cathode ray tube (CRT) technology-used in televisions and monitors for more than 60 years-has generated a lot of waste, now that is has been replaced by newer technologies such as plasma, liquid crystal display (LCD), and light-emitting diodes (LED). There are no official statistics on the amount of waste generated in Brazil; however, for some countries, such as the United States, China, and Taiwan, the estimated annual disposal of televisions and monitors is 3.2 million, 5 million, and 1 million, respectively. Monitors mainly contain polymers, metals, and ceramics, some of which may be hazardous. This work is focused on characterization and recycling of polymeric frames of CRT monitors. Monitors, damaged and obsolete, were collected and separated by brand, comminuted, and then injected to obtain the samples to be used in mechanical tests. The results pointed to the same polymeric material being used, viz. acrylonitrile butadiene styrene (ABS), regardless of the brand. The mechanical properties varied across different brands, probably because of different compositions. This variation was also observed in the analysis of the fracture surface of the samples after the tensile test. On the basis of the results, it can be concluded that the recycled material showed satisfactory mechanical performance, enabling recycling technically.

show abstract

Influence of cleaning conditions on the degradation of recycled HDPE

Santana

Gondim

2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

One of the materials most commonly found in municipal plastic waste (MPW) is High Density Polyethylene (HDPE), which is used particularly for food packaging and cleaning product containers. Postconsumer HDPE is generally contaminated with other impurities and, therefore, a cleaning process is necessary before it can be reprocessed. The aim of this study was to investigate the influence of the cleaning conditions on the oxidative degradation of postconsumer HDPE. These plastic materials were washed in NaOH solution, liquid detergent (D), and a mixture of NaOH/D (1 : 1). Results for the melt flow rate (MFR) and capillary rheometry showed that NaOH has a great influence on the oxidative degradation of HDPE. The HDPE treated with NaOH solution had a lower decomposition temperature, observed through Thermal Gravimetric (TG) analysis, and a lower the Oxidative Induction Time (OIT), obtained via Differential Scanning Calorimeter (DSC). Finally, the oxidative degradation of HDPE was verified through a higher carbonyl index.

show abstract

Studies on Thermo-Mechanical Properties of Post-Consumer High Impact Polystyrene in Five Reprocessing Steps

Cited by 20 publications

References 4 publications

Evaluation of the Effect of the Incorporation of Rubber Tire Waste Particles on the Properties of PP, HIPS and PP/HIPS Matrices

Evaluation of the Effect of the Incorporation of Rubber Tire Waste Particles on the Properties of PP, HIPS and PP/HIPS Matrices

Reciclagem de Carcaças de Monitores: Propriedades mecânicas e morfológicas

Influence of cleaning conditions on the degradation of recycled HDPE

Contact Info

Product

Resources

About