Recycling Ability of Biodegradable Matrices and Their Cellulose-Reinforced Composites in a Plastic Recycling Stream |
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Authors: | J P Lopez J Girones J A Mendez J Puig M A Pelach |
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Institution: | (1) Grup Lepamap, Departament d’Enginyeria Qu?mica Agr?ria i Tecnologia Agroaliment?ria, Universitat de Girona, Campus Montilivi s/n, 17071 Girona, Spain;(2) Instituto de Ciencia y Tecnolog?a de Pol?meros (ICTP), Consejo Superior de Investigaciones Cient?ficas (CSIC), Biomateriales, C/Juan de la Cierva, 3, 28006 Madrid, Spain; |
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Abstract: | The effect of multiple injection-moulding reprocessing of three biodegradable matrices on their mechanical properties, melt
flow rate, molecular weight, phase transition temperatures and degradation temperature is presented. It has been found that,
with successive reprocessing, tensile, flexural and impact strength decreased. Drop in mechanical properties has been assigned
to degradation of the matrices, as corroborated by melt flow and molecular weight analysis. Although reprocessing did not
significantly affect the glass transition, it diminished the melting point and degradation temperature of polymers. Results
indicate that neat PLLA can be recycled for up to five times without suffering a drastic loss in mechanical and thermal properties.
The aliphatic polyester Mater-Bi TF01U/095R can be recycled for up to 10 times, whilst starch-based Mater-Bi YI014U/C wastes
should be destined to composting, since its recyclability is very poor. The effect of reprocessing on composites reinforced
with chemithermomechanical pulp (CTMP) followed the tendencies observed for the neat matrices. Whilst CTMP-fibres behave mainly
as filler in PLLA composites, reinforced thermoplastic starch-based composites presented enhanced mechanical properties and
recyclability. |
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