Particleboards were made using particles from sugarcane bagasse and eucalyptus residues of the pulp industry. The particleboard properties were evaluated according to ABNT NBR 14810-1 (2013), ABNT NBR 14810-2 (2013), and ANSI A208.1 (1999) standards, which compared the efficiency of castor oil-based polyurethane resin (PU-Castor) and urea-formaldehyde resin (UF). The particleboards were composed of 60% wood particles and 40% bagasse, with a 10% adhesive dose based on the dry mass of particles. The following parameters were evaluated: apparent density, moisture content (MC), thickness swelling after 24 h, modulus of rupture (MOR), modulus of elasticity to static bending (MOE), and internal bond strength of panels (IB). The results obtained demonstrated the potential use of eucalyptus and sugarcane bagasse residues in the production of high-density particleboards. The panels produced with PU-Castor showed greater efficiency, and their physical and mechanical properties were compatible with the requirements of the Brazilian standard for P4 panels (structural panels for use in dry conditions) and the American standard for H-3 panels (high industrial density).

No abstract

A high prevalence of overweight and obesity was found in this study, indicating that children of both genders are affected regardless of their economical status and age.

Researchers from the Polymer Technology and Analytical Chemistry (LQATP) group at the São Carlos Institute of Chemistry, University of São Paulo, developed a polyurethane adhesive based on castor oil. In addition to deriving it from a renewable source, this adhesive is nonaggressive to humans and the environment. The purpose of this study is to investigate the feasible use of polyurethane adhesive based on castor oil in the production of 12 beams of Glulam, using the species Pinus caribea hondurensis and Eucaliptus grandis. The structural performance of the beams of Glulam was evaluated through static bending tests. The results obtained enabled to conclude good efficiency of the polyurethane adhesive based on castor oil, for use in Glulam.

Ao Professor Dr. Antonio Alves Dias pela orientação segura e incansável durante a elaboração deste trabalho, incentivo, confiança e amizade. À Prof. Dr. Gilberto Orivaldo Chierice e todos os funcionários do Laboratório de Química Analítica e Tecnologia de Polímeros do IQSC-USP pelo auxílio e preparação do poliól e do prepolímero empregados neste. Ao colega de pós-graduação Mariano Martinez Espinosa pela orientação segura do planejamento estatístico e análise dos resultados experimentais e teóricos. À todos os colegas de pós-graduação, professores e funcionários dos Laboratório de Madeiras e Estruturas de Madeiras e Estruturas de Madeiras, que direta ou indiretamente, participaram na elaboração deste trabalho. v SUMÁRIO