| Title | New opportunities to valorize biomass wastes into green materials. II. Behaviour to accelerated weathering |
|---|---|
| ID_Doc | 69473 |
| Authors | Spiridon, I; Darie-Nita, RN; Bele, A |
| Title | New opportunities to valorize biomass wastes into green materials. II. Behaviour to accelerated weathering |
| Year | 2018 |
| Published | |
| Abstract | The use of agricultural wastes as component of biodegradable materials represents a benefit for the environment, as well as for local economy. Our investigation has focused on the possibility to expand the use of some agriculture by-products by turning them into new biodegradable composites and to investigate their behaviour to accelerated weathering. We found that polylactic acid was more affected by the combined action of temperature, humidity and UV radiation as compared to composite materials. The tensile strength decreased by 73.66% for polylactic acid as matrix, 26% for the composite comprising celery root fibres, 3% for the composite comprising Asclepias syriaca fibres and 1% for the composite with poplar seed hair fibres. An increase of 31% was registered for the material comprising pomace, which can be explained by biomass composition, where lignin is the major component. The increase of storage modulus with ageing could be related with the increase of rigidity and chain packing, which can be connected to an enhanced density induced by ageing. All composites showed increased water sorption capacity values, while Atomic Force Microscopy images revealed the deterioration of the surface of the materials exposed to the combined action of UV, temperature and humidity. Scanning Electron Microscopy images of weathered materials evidenced some voids between the filler particles and the poly lactic acid matrix, but most of the filler particles were still kept intact within the matrix. The economic study evidenced a great potential for achieving green materials at reasonable costs. The obtained results indicate that different biomass wastes can be used as filler for a polylactic acid matrix. In the pursuit of sustainable waste management, our findings can play a significant role in elaborating a business model. (C) 2017 Elsevier Ltd. All rights reserved. |
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