%0 Journal Article %1 APP:APP42721 %A Roé-Sosa, Adriana %A Estrada, Mirna R. %A Calderas, Fausto %A Sánchez-Arévalo, Francisco %A Manero, Octavio %A de Velasquez, María Teresa Orta L. %D 2015 %J Journal of Applied Polymer Science %K myown %N 43 %P n/a--n/a %R 10.1002/app.42721 %T Degradation and biodegradation of polyethylene with pro-oxidant aditives under compost conditions establishing relationships between physicochemical and rheological parameters %U http://dx.doi.org/10.1002/app.42721 %V 132 %X In the present work, an analysis is carried out to provide a relationship between the Molecular Weight (Mw) of degraded LDPE films (containing Mn stearate as pro oxidant (MnSt-LDPE) and changes in viscosity, elongation at break (EB %) and carbonyl index (CI) occurring during thermal degradation in the thermophilic phase of the compost process. The thermal treatment comprised various temperatures (50°C, 60°C, and 70°C) and exposure times, and was characterized through a so-called Energy-Time Factor (the product of thermal energy and exposure time). Changes in viscosity, EB %, and CI were correlated to this factor. A modified Mark-Houwink equation was used to relate the zero shear-rate viscosity and Mw of the degraded LDPE films. Results indicate that the EB %, Mw and viscosity decrease simultaneously with an increase in the CI as the Energy-Time Factor augments, allowing the assessment of the variation of these properties with Mw. Calculations of the percentage abiotic degradation (%D) of LDPE films indicate that a Mw of 6 kg mol−1 corresponds to a maximum abiotic degradation degree of 91.85%, which is henceforth susceptible to biodegradation. The film treated with Energy-Time Factor of 2.79E+09 J s mol−1 reached a 74% of biodegradation in 90 days (average time of the composting process). Results exhibit clearly the correlation between abiotic and biotic degradation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42721.

@article{APP:APP42721, abstract = {In the present work, an analysis is carried out to provide a relationship between the Molecular Weight (Mw) of degraded LDPE films (containing Mn stearate as pro oxidant (MnSt-LDPE) and changes in viscosity, elongation at break (EB %) and carbonyl index (CI) occurring during thermal degradation in the thermophilic phase of the compost process. The thermal treatment comprised various temperatures (50°C, 60°C, and 70°C) and exposure times, and was characterized through a so-called Energy-Time Factor (the product of thermal energy and exposure time). Changes in viscosity, EB %, and CI were correlated to this factor. A modified Mark-Houwink equation was used to relate the zero shear-rate viscosity and Mw of the degraded LDPE films. Results indicate that the EB %, Mw and viscosity decrease simultaneously with an increase in the CI as the Energy-Time Factor augments, allowing the assessment of the variation of these properties with Mw. Calculations of the percentage abiotic degradation (%D) of LDPE films indicate that a Mw of 6 kg mol−1 corresponds to a maximum abiotic degradation degree of 91.85%, which is henceforth susceptible to biodegradation. The film treated with Energy-Time Factor of 2.79E+09 J s mol−1 reached a 74% of biodegradation in 90 days (average time of the composting process). Results exhibit clearly the correlation between abiotic and biotic degradation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42721.}, added-at = {2016-03-09T19:37:46.000+0100}, author = {Roé-Sosa, Adriana and Estrada, Mirna R. and Calderas, Fausto and Sánchez-Arévalo, Francisco and Manero, Octavio and de Velasquez, María Teresa Orta L.}, biburl = {https://www.bibsonomy.org/bibtex/286bc3c8e8d8c4c21e70a47fd9ddca624/faustocg}, doi = {10.1002/app.42721}, interhash = {267515e35846b52e6e835dd018366d1c}, intrahash = {86bc3c8e8d8c4c21e70a47fd9ddca624}, issn = {1097-4628}, journal = {Journal of Applied Polymer Science}, keywords = {myown}, number = 43, pages = {n/a--n/a}, timestamp = {2016-03-09T19:37:46.000+0100}, title = {Degradation and biodegradation of polyethylene with pro-oxidant aditives under compost conditions establishing relationships between physicochemical and rheological parameters}, url = {http://dx.doi.org/10.1002/app.42721}, volume = 132, year = 2015 }