Abstract
Abstract Starches polymeric films offer several advantages for the replacement of synthetic polymers due to their biodegradability, non-toxicity, availability and low cost. However, the high biodegradation potential can cause fragility, considering some fundamental mechanical properties. Therefore, starch based polymeric films were reinforced incorporating lignocellulosic waste from coffee grounds post-consume. The effect of incorporation of coffee ground in cornstarch matrix and polymer interaction on morphology, thermal and mechanical properties were investigated. The characterization analyzes were based on Dynamic Mechanical Thermal Analysis (DMTA), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA) and Scanning Eletronic Microscopy (SEM). The coffee ground behaved as reinforcement agent according tensile values. Thermochemical conversion showed that polymeric films molding did not change his thermal stability. In temperature range was possible to observe the devolatilization, organic and inorganic compounds decomposition. SEM images showed the coffee ground adhesion in the polymer matrix promoting a better mechanical tensile strength.
Highlights
Industrial process produces an enormous amount of waste materials, which may be not deposited safely
The results of the mechanical characterization indicated an increase in the tensile strength of the samples that had the coffee residue in their composition
Except for the one with 0.50% of coffee ground waste, had higher values of tension higher than that of the film without coffee grounds, and the best result was that of the film with 0.30% of coffee ground
Summary
Industrial process produces an enormous amount of waste materials, which may be not deposited safely. The population increasing is responsible for the amount and type of waste generated 1,2, promoting an environmental problems. Recycling is an effective process for the reuse of some types of waste, in Brazil, recycling of solid urban and industrial wastes is still a problem 4,5. The last IBGE official data reported that only 1.4% of Brazilian urban solid waste is sent to sorting and after, recycling facilities 6. The current interest of industries is to use the cleaner technologies, reusing or avoiding the generation of waste and by-products of the productive processes 7,8. There is difficulty in recycling synthetic polymers, which encourages the study and development of biodegradable materials 9
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