Recyclability of PET from virgin resin
Bottle grade virgin PET (polyethylene terephthalate) resin was investigated through five consecutive injection molding steps to simulate recycling cycles. Tests were carried out after each recycling to evaluate degradation, crystallinity (by density and Differential Scanning Calorimetry-DSC measurem...
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
1999-01-01
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Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14391999000100006 |
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doaj-7b9d7d5b180d456ba399b1f7cc5a1e1b2020-11-24T21:57:43ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14391999-01-0121333810.1590/S1516-14391999000100006Recyclability of PET from virgin resinSandro Donnini ManciniMaria ZaninBottle grade virgin PET (polyethylene terephthalate) resin was investigated through five consecutive injection molding steps to simulate recycling cycles. Tests were carried out after each recycling to evaluate degradation, crystallinity (by density and Differential Scanning Calorimetry-DSC measurements), hardness, and tensile and flexural properties. Consecutive recycling resulted in cumulative chain breaks caused by the material's contact with degrading agents such as temperature, oxygen, mechanical stresses, light, and water. In the fifth recycling step, for example, the number of carboxylic end groups, an indicator of the extent of chain-break, tripled in comparison to the initial molecule. The smaller chains that were formed fit more easily among the larger ones, thus increasing the percentage of crystalline phase in the structure. These two changes in the polymer's structure explained the recycled products' final properties, i.e., the injected samples became progressively harder and more fragile in each recycling step.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14391999000100006recyclingPETcrystallinitydegradationmechanical properties |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sandro Donnini Mancini Maria Zanin |
spellingShingle |
Sandro Donnini Mancini Maria Zanin Recyclability of PET from virgin resin Materials Research recycling PET crystallinity degradation mechanical properties |
author_facet |
Sandro Donnini Mancini Maria Zanin |
author_sort |
Sandro Donnini Mancini |
title |
Recyclability of PET from virgin resin |
title_short |
Recyclability of PET from virgin resin |
title_full |
Recyclability of PET from virgin resin |
title_fullStr |
Recyclability of PET from virgin resin |
title_full_unstemmed |
Recyclability of PET from virgin resin |
title_sort |
recyclability of pet from virgin resin |
publisher |
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
series |
Materials Research |
issn |
1516-1439 |
publishDate |
1999-01-01 |
description |
Bottle grade virgin PET (polyethylene terephthalate) resin was investigated through five consecutive injection molding steps to simulate recycling cycles. Tests were carried out after each recycling to evaluate degradation, crystallinity (by density and Differential Scanning Calorimetry-DSC measurements), hardness, and tensile and flexural properties. Consecutive recycling resulted in cumulative chain breaks caused by the material's contact with degrading agents such as temperature, oxygen, mechanical stresses, light, and water. In the fifth recycling step, for example, the number of carboxylic end groups, an indicator of the extent of chain-break, tripled in comparison to the initial molecule. The smaller chains that were formed fit more easily among the larger ones, thus increasing the percentage of crystalline phase in the structure. These two changes in the polymer's structure explained the recycled products' final properties, i.e., the injected samples became progressively harder and more fragile in each recycling step. |
topic |
recycling PET crystallinity degradation mechanical properties |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14391999000100006 |
work_keys_str_mv |
AT sandrodonninimancini recyclabilityofpetfromvirginresin AT mariazanin recyclabilityofpetfromvirginresin |
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1725853980222816256 |