Abstract
The study of the physical properties and chemical composition of the wood are of great importance for being related to industrial transformation as well as its aptness the most varied forms of use. On this basis, this study aimed to evaluate the chemical and physical properties of Cryptomeria japonica in wood samples for the heartwood and sapwood. The chemical properties of the content of extractives, lignin and inorganic materials content and hydrogenic potential (pH) were determined. The physical properties related to determination of density and dimensional stability, were evaluated by using 951 samples. In general, both wood samples presented chemical properties compatible with the literature for Cryptomeria japonica. For both samples a low content of extractives was obtained, being lower in the sapwood. The results indicated that the species presented density from low to medium; it is similar to both wood samples. Regarding the dimensional stability Cryptomeria japonica was rated as good stability.
Highlights
O estudo das propriedades físicas e a composição química da madeira são de grande importância por estarem relacionadas à transformação industrial, bem como à sua aptidão as mais variadas formas de utilização
The study of the physical properties and chemical composition of the wood are of great importance for being related to industrial transformation as well as its aptness the most varied forms of use
This study aimed to evaluate the chemical and physical properties of Cryptomeria japonica in wood samples for the heartwood and sapwood
Summary
A madeira de Cryptomeria japonica avaliada na presente pesquisa foi proveniente de plantios experimentais localizados na Estação Experimental da Universidade Federal do Paraná, na cidade de Rio Negro, PR. A partir das tábuas foram separadas amostras da região do cerne e do alburno para a avaliação das propriedades químicas e físicas. Determinação da composição química Das extremidades das tábuas foram extraídas amostras de 1 cm, e a partir desse material foram separados manualmente entre cerne e alburno, com o auxílio de um formão, para a determinação das propriedades químicas. Avaliação das propriedades químicas Os valores médios da composição química da madeira de Cryptomeria japonica são apresentados na Tabela 1. Para o teor de componentes solúveis em hidróxido de sódio (NaOH), o qual pode ser um indicativo da presença de biodeterioração da madeira pela ação de agentes xilófagos, verificou-se um valor médio para a espécie de 9,35%, e de 11,02% para o cerne e 7,65% para o alburno.
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