Distilled pyroligneous liquor obtained from Eucalyptus grandis and chitosan: physicochemical properties of the solution and films

• Published in: Environmental science and pollution research international 2019, Vol.26 (1), p.672-683
• Main Authors: da Silva Porto, Fabiane Grecco, Campos, Ângela Diniz, Garcia, Irene Teresinha Santos
• Format: Article
• Language: English
• Subjects: Absorptivity; Antimicrobial activity; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Charcoal; Chitosan; Chitosan - chemistry; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Eucalyptus; Eucalyptus - chemistry; Eucalyptus grandis; Liquor; Organic chemistry; Permeability; Physical chemistry; Physicochemical properties; Plant Extracts - chemistry; Polymers; Polymers - chemistry; Properties (attributes); Protective coatings; Research Article; Steam; Submerging; Thermal degradation; Vapor resistance; Waste Water Technology; Water - chemistry; Water Management; Water Pollution Control; Water resistance; Water vapor; Weight
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-018-3590-x

The pyroligneous liquor is a product obtained during the production of charcoal, with well-known antimicrobial activity. In this work, we characterized the physical chemistry properties of a formulation composed of distilled pyroligneous liquor (DPL), obtained from Eucalyptus grandis , and chitosan. A good interaction between the polymer and the solvent was observed. Auto-supported films were prepared with these systems and characterized with respect to their structure and photo-protection properties, water vapor permeability, and resistance to water and to thermal degradation. They present a semi-crystalline structure and are hygroscopic, but are stable under immersion for up to 7 days. The swelling degree in water is 300% in weight and the permeability to water vapor was between 30 and 45 g m −1  h −1 (for films with 80 to 10 μm, respectively). The obtained films are able to efficiently block the incident UVB and UVC radiation; the molar absorptivity decreases exponentially with increasing wavelength and is stable up to 300 °C. These properties confer desirable properties to the films, obtained from these precursors of a renewable source, to be used as coatings.